Catalina Island Weather by Month
Catalina Island, located off the coast of Southern California, is known for its mild Mediterranean climate, scenic coastline, clear-water coves, and charming waterfront town of Avalon. The island experiences cool, relatively wet winters and warm, very dry summers, making it a year-round destination for hiking, sightseeing, snorkeling, kayaking, and boating.
Catalina Island Weather by Month
You can click the image below to view the full-size weather chart for Catalina Island.
January – Cool, Mild and Moderately Wet
- Average high: 57°F (14°C)
- Average low: 46°F (8°C)
- Rainfall: 2.30 inches (58.3 mm)
- Water temperature: 59°F (15°C)
- Daylight: 10 hours
January is one of the coolest and wetter months on Catalina Island. Average daytime temperatures reach around 57°F (14°C), while nighttime temperatures fall to approximately 46°F (8°C). The weather is generally mild compared with many mainland winter destinations, although cool mornings, coastal breezes, and occasional showers are common.
Rainfall averages about 2.30 inches (58.3 mm), so it is worth keeping a flexible schedule for outdoor activities. Ocean temperatures are around 59°F (15°C), which can feel cold for swimming without a wetsuit. With approximately 10 hours of daylight, visitors can still explore Avalon, enjoy coastal viewpoints, and take scenic walks when conditions are favorable.
Best for:
- Exploring Avalon and its waterfront
- Enjoying peaceful coastal walks
- Taking photographs of the island’s scenery
- Discovering local attractions away from peak-season crowds
February – Cool, Wet and Peaceful
- Average high: 57°F (14°C)
- Average low: 45°F (7°C)
- Rainfall: 2.53 inches (64.3 mm)
- Water temperature: 58°F (14°C)
- Daylight: 11 hours
February is the wettest month on Catalina Island according to the supplied rainfall data. Average daytime highs remain around 57°F (14°C), while nighttime temperatures drop to approximately 45°F (7°C). Conditions are generally suitable for sightseeing and walking, provided you bring a warm layer for cooler mornings and evenings.
Rainfall reaches about 2.53 inches (64.3 mm), although showers do not necessarily last all day. The ocean averages around 58°F (14°C), making a wetsuit advisable for extended water activities. With 11 hours of daylight, visitors have more time to explore Avalon, enjoy harbor views, and discover the island’s natural scenery.
Best for:
- Visiting during the quieter winter season
- Exploring Avalon on foot
- Enjoying scenic coastal viewpoints
- Taking nature walks between showers
March – Mild and Gradually Drier
- Average high: 59°F (15°C)
- Average low: 46°F (8°C)
- Rainfall: 1.54 inches (39.1 mm)
- Water temperature: 58°F (14°C)
- Daylight: 12 hours
March brings slightly warmer temperatures and less rainfall than the winter months. Average daytime highs reach 59°F (15°C), while nighttime lows remain around 46°F (8°C). The mild weather is suitable for hiking, sightseeing, and exploring Catalina Island’s coastal trails.
Rainfall averages 1.54 inches (39.1 mm), and longer days provide more opportunities for outdoor adventures. Ocean temperatures remain around 58°F (14°C), so the water can feel quite cold for swimming and snorkeling without suitable thermal protection. Visitors should bring layers and check the forecast before planning boat trips.
Best for:
- Hiking and exploring scenic trails
- Taking boat trips when conditions permit
- Enjoying spring scenery
- Exploring Avalon and its harbor
April – Mild, Comfortable and Mostly Dry
- Average high: 61°F (16°C)
- Average low: 46°F (8°C)
- Rainfall: 0.58 inches (14.7 mm)
- Water temperature: 59°F (15°C)
- Daylight: 13 hours
April brings milder weather and a noticeable decrease in rainfall. Average daytime temperatures reach 61°F (16°C), while nighttime lows remain around 46°F (8°C). These comfortable conditions are ideal for exploring the island’s walking trails, visiting scenic viewpoints, and discovering Avalon.
Rainfall drops to approximately 0.58 inches (14.7 mm), making outdoor plans easier to arrange. The ocean averages around 59°F (15°C), which is still chilly for swimming without a wetsuit. With 13 hours of daylight, visitors have plenty of time for hiking, sightseeing, and enjoying the coastline.
Best for:
- Hiking and outdoor sightseeing
- Exploring Avalon and its waterfront
- Photographing coastal landscapes
- Enjoying longer spring days
May – Pleasant, Mild and Very Dry
- Average high: 63°F (17°C)
- Average low: 48°F (9°C)
- Rainfall: 0.36 inches (9.1 mm)
- Water temperature: 61°F (16°C)
- Daylight: 14 hours
May offers pleasant temperatures and very little rainfall on Catalina Island. Average highs reach 63°F (17°C), while nighttime lows average 48°F (9°C). The comfortable weather is excellent for hiking, cycling, sightseeing, and exploring the island’s rugged coastal scenery.
Rainfall averages just 0.36 inches (9.1 mm), making May one of the driest months of the year. Ocean temperatures rise to approximately 61°F (16°C), although the water may still feel cold for prolonged swimming. With 14 hours of daylight, visitors can comfortably combine several outdoor activities in one day.
Best for:
- Hiking and guided outdoor adventures
- Exploring scenic viewpoints
- Kayaking and boating in suitable conditions
- Enjoying long, mild spring days
June – Warm, Sunny and Dry
- Average high: 68°F (20°C)
- Average low: 52°F (11°C)
- Rainfall: 0.11 inches (2.8 mm)
- Water temperature: 64°F (18°C)
- Daylight: 14.5 hours
June marks the beginning of the warmer summer season. Average daytime temperatures rise to 68°F (20°C), while nighttime lows reach approximately 52°F (11°C). The weather is generally comfortable for outdoor activities without the intense heat often experienced in inland Southern California.
Rainfall averages only 0.11 inches (2.8 mm), making wet weather uncommon. Ocean temperatures climb to around 64°F (18°C), offering better conditions for snorkeling, kayaking, and swimming for visitors comfortable with cooler water. June also has the longest daylight of the year, at approximately 14.5 hours.
Best for:
- Snorkeling and kayaking
- Exploring hiking trails
- Taking scenic boat excursions
- Enjoying extended daylight hours
July – Warm, Sunny and Extremely Dry
- Average high: 73°F (23°C)
- Average low: 57°F (14°C)
- Rainfall: 0.07 inches (1.7 mm)
- Water temperature: 67°F (19°C)
- Daylight: 14 hours
July is one of the warmest months on Catalina Island, with average highs of 73°F (23°C) and lows of 57°F (14°C). The pleasant summer temperatures make it an excellent time for beach outings, water sports, hiking, and exploring the island’s scenic coastline.
Rainfall averages just 0.07 inches (1.7 mm), so rainy weather is unusual. Ocean temperatures reach approximately 67°F (19°C), making swimming and snorkeling more appealing than during winter and spring, although the water may still feel cool. July is a popular travel month, so booking accommodation and tours ahead of time is recommended.
Best for:
- Swimming and snorkeling
- Kayaking along the coast
- Hiking and outdoor tours
- Enjoying classic summer island activities
August – Warmest, Sunny and Very Dry
- Average high: 75°F (24°C)
- Average low: 59°F (15°C)
- Rainfall: 0.02 inches (0.6 mm)
- Water temperature: 68°F (20°C)
- Daylight: 13.5 hours
August is the warmest month on Catalina Island, with average daytime highs of 75°F (24°C) and nighttime lows of 59°F (15°C). The comfortable warmth is ideal for outdoor adventures, and temperatures are generally milder than those found in many inland parts of California.
Rainfall averages only 0.02 inches (0.6 mm), making August the driest month in the supplied data. Ocean temperatures reach approximately 68°F (20°C), the warmest level of the year in this estimate. Swimming, snorkeling, kayaking, and boating are popular activities, although ocean conditions can vary. Expect more visitors around Avalon and other popular attractions during the summer holiday season.
Best for:
- Enjoying beach and water activities
- Snorkeling and kayaking
- Taking scenic boat trips
- Making the most of warm summer weather
September – Warm, Comfortable and Dry
- Average high: 73°F (23°C)
- Average low: 59°F (15°C)
- Rainfall: 0.11 inches (2.7 mm)
- Water temperature: 68°F (20°C)
- Daylight: 12.5 hours
September maintains much of the warmth of summer while bringing slightly shorter days. Average daytime highs reach 73°F (23°C), and nighttime lows remain around 59°F (15°C). The comfortable temperatures make this month an excellent choice for outdoor activities without the hottest conditions.
Rainfall averages just 0.11 inches (2.7 mm), so dry weather remains typical. Ocean temperatures stay around 68°F (20°C), making September one of the best months for swimming, snorkeling, and kayaking. Visitors can also explore Avalon, hike inland trails, and take boat excursions while enjoying the lingering summer atmosphere.
Best for:
- Swimming and snorkeling
- Exploring coastal trails and viewpoints
- Taking scenic boat excursions
- Enjoying warm weather outside the peak summer period
October – Mild, Dry and Pleasant
- Average high: 68°F (20°C)
- Average low: 55°F (13°C)
- Rainfall: 0.58 inches (14.8 mm)
- Water temperature: 66°F (19°C)
- Daylight: 11.5 hours
October brings gradually cooler temperatures to Catalina Island, but the weather remains mild enough for outdoor adventures. Average highs reach 68°F (20°C), while nighttime lows fall to approximately 55°F (13°C). These conditions are well suited to hiking, sightseeing, and exploring the island’s coastal communities.
Rainfall averages 0.58 inches (14.8 mm), which is still relatively low compared with winter. Ocean temperatures remain around 66°F (19°C), allowing for swimming and snorkeling if you are comfortable with cooler water. With 11.5 hours of daylight, visitors can enjoy a variety of activities while potentially experiencing a quieter atmosphere than during the summer holidays.
Best for:
- Hiking and exploring scenic trails
- Visiting Avalon and its waterfront
- Enjoying coastal photography
- Taking boat trips in suitable weather
November – Cool and Increasingly Wet
- Average high: 63°F (17°C)
- Average low: 50°F (10°C)
- Rainfall: 0.91 inches (23 mm)
- Water temperature: 63°F (17°C)
- Daylight: 10.5 hours
November marks the transition toward Catalina Island’s cooler, wetter season. Average daytime highs reach 63°F (17°C), while nighttime lows fall to around 50°F (10°C). The weather remains relatively mild, although coastal breezes and cooler evenings make a jacket useful.
Rainfall increases to approximately 0.91 inches (23 mm). Ocean temperatures average around 63°F (17°C), which may feel chilly for swimming without a wetsuit. With 10.5 hours of daylight, visitors can still enjoy sightseeing, walking around Avalon, and exploring coastal viewpoints when the weather cooperates.
Best for:
- Exploring Avalon during a quieter season
- Enjoying coastal walks
- Taking scenic photographs
- Discovering local attractions and restaurants
December – Cool, Peaceful and Moderately Wet
- Average high: 57°F (14°C)
- Average low: 46°F (8°C)
- Rainfall: 2.27 inches (57.7 mm)
- Water temperature: 60°F (16°C)
- Daylight: 10 hours
December brings cooler temperatures and a greater chance of rainfall to Catalina Island. Average daytime highs reach 57°F (14°C), while nighttime lows average 46°F (8°C). Although it is winter, conditions are generally milder than in many mainland destinations, making the island a pleasant option for a peaceful coastal getaway.
Rainfall averages about 2.27 inches (57.7 mm), making December one of the wetter months. Ocean temperatures are approximately 60°F (16°C), so swimming may be uncomfortable without thermal protection. With around 10 hours of daylight, visitors should plan outdoor activities during the middle of the day and leave room in their schedules for occasional showers.
Best for:
- Enjoying a peaceful winter getaway
- Exploring Avalon and its waterfront
- Taking coastal walks between showers
- Discovering the island outside the summer crowds
Catalina Island Weather by Month: Summary Table
| Month | Avg High °F (°C) | Avg Low °F (°C) | Rainfall (inches) | Water temperature (°F) | Daylight (hours) |
|---|---|---|---|---|---|
| January | 57°F (14°C) | 46°F (8°C) | 2.30 | 59°F (15°C) | 10 |
| February | 57°F (14°C) | 45°F (7°C) | 2.53 | 58°F (14°C) | 11 |
| March | 59°F (15°C) | 46°F (8°C) | 1.54 | 58°F (14°C) | 12 |
| April | 61°F (16°C) | 46°F (8°C) | 0.58 | 59°F (15°C) | 13 |
| May | 63°F (17°C) | 48°F (9°C) | 0.36 | 61°F (16°C) | 14 |
| June | 68°F (20°C) | 52°F (11°C) | 0.11 | 64°F (18°C) | 14.5 |
| July | 73°F (23°C) | 57°F (14°C) | 0.07 | 67°F (19°C) | 14 |
| August | 75°F (24°C) | 59°F (15°C) | 0.02 | 68°F (20°C) | 13.5 |
| September | 73°F (23°C) | 59°F (15°C) | 0.11 | 68°F (20°C) | 12.5 |
| October | 68°F (20°C) | 55°F (13°C) | 0.58 | 66°F (19°C) | 11.5 |
| November | 63°F (17°C) | 50°F (10°C) | 0.91 | 63°F (17°C) | 10.5 |
| December | 57°F (14°C) | 46°F (8°C) | 2.27 | 60°F (16°C) | 10 |
Overall, May through September is generally the best period to visit Catalina Island for warm, dry weather and outdoor activities. July through September are especially appealing for water sports, with ocean temperatures reaching approximately 67–68°F (19–20°C). For hiking, sightseeing, and a quieter island experience, May, June, and October are also excellent options. Winter visitors can enjoy mild coastal scenery, but should prepare for cooler temperatures and a greater chance of rain.
20 FAQs About Catalina Island Weather
1. What is the best month to visit Catalina Island?
May through September is generally the best time to visit Catalina Island for warm temperatures, low rainfall, and outdoor activities. July, August, and September are especially good for swimming, snorkeling, kayaking, and boating.
2. What is the weather like on Catalina Island year-round?
Catalina Island has a mild Mediterranean climate with cool, relatively wet winters and warm, dry summers. Average highs range from about 57°F (14°C) in winter to 75°F (24°C) in August.
3. What is the hottest month on Catalina Island?
August is typically the hottest month, with an average high of 75°F (24°C) and an average low of 59°F (15°C). The weather is warm and dry, making it ideal for hiking and water activities.
4. What is the coldest month on Catalina Island?
February is among the coldest months, with an average high of 57°F (14°C) and an average low of 45°F (7°C). January and December are also cool, especially during the evening and early morning.
5. Does it rain a lot on Catalina Island?
No, Catalina Island generally receives relatively little rainfall. Most rain occurs between November and March, while summer is very dry. February is the wettest month in the supplied data, with approximately 2.53 inches (64.3 mm) of rainfall.
6. What is the driest month on Catalina Island?
August is the driest month in the supplied data, with only about 0.02 inches (0.6 mm) of rainfall. July and September are also very dry, making summer a reliable period for outdoor activities.
7. Can you visit Catalina Island in winter?
Yes, Catalina Island is a good winter destination for sightseeing, coastal walks, and exploring Avalon. Temperatures are generally mild compared with many mainland destinations, although visitors should prepare for occasional rain, cool evenings, and breezy conditions.
8. What should I wear on Catalina Island?
Wear lightweight clothing during warmer days and bring a jacket or extra layer for cool mornings, evenings, and coastal breezes. If you plan to hike, comfortable walking shoes are recommended. A wetsuit may be useful for swimming or snorkeling, especially in cooler months.
9. Is Catalina Island warm enough to swim in?
Yes, but the ocean can feel cool throughout the year. Water temperatures range from approximately 58°F (14°C) in late winter and early spring to 68°F (20°C) in late summer. Many visitors prefer a wetsuit for longer swims or snorkeling sessions.
10. What is the water temperature on Catalina Island in January?
The average ocean temperature in January is approximately 59°F (15°C). This is relatively cold for swimming without thermal protection, although snorkeling and diving are possible with an appropriate wetsuit.
11. What is the water temperature on Catalina Island in summer?
Ocean temperatures generally rise during summer, reaching around 67°F (19°C) in July and 68°F (20°C) in August and September. These are among the warmest months for swimming, snorkeling, and kayaking.
12. When is the best time to go snorkeling on Catalina Island?
June through September is generally an excellent period for snorkeling because the weather is warm, rainfall is minimal, and ocean temperatures are relatively high. Always check visibility, surf, and local ocean conditions before entering the water.
13. Is Catalina Island windy?
Catalina Island can experience coastal breezes, and wind conditions vary by location and weather system. Breezes may make temperatures feel cooler, particularly near the water and on exposed hiking trails. Check the forecast before booking boat trips or planning water sports.
14. How much sunshine does Catalina Island get in summer?
Summer generally brings dry weather and long daylight hours. June has the longest daylight in the supplied data, at approximately 14.5 hours, while July and August also offer extended opportunities for outdoor activities.
15. What is Catalina Island like in spring?
Spring brings gradually warmer temperatures and decreasing rainfall. March averages 59°F (15°C), while May reaches around 63°F (17°C). Spring is a pleasant time for hiking, sightseeing, and exploring the island before the busiest summer period.
16. Is October a good time to visit Catalina Island?
Yes. October offers mild temperatures, with an average high of 68°F (20°C), and relatively low rainfall. Ocean temperatures average around 66°F (19°C), so swimming and snorkeling may still be enjoyable for visitors comfortable with cooler water.
17. Does Catalina Island get cold at night?
Yes, nighttime temperatures can be cool, even during summer. Average lows range from about 45°F (7°C) in February to 59°F (15°C) in August and September. Bringing a light jacket is advisable throughout the year.
18. How many hours of daylight does Catalina Island have in winter?
Catalina Island receives approximately 10 hours of daylight in December and January, increasing to around 11 hours in February. Plan hiking and other outdoor activities earlier in the day during winter.
19. Is Catalina Island crowded during the summer?
Summer is a popular time to visit because of the warm, dry weather and favorable conditions for water activities. Avalon and popular attractions can be busier during this period, so booking accommodation, ferry tickets, and tours in advance is recommended.
20. What is the cheapest time to visit Catalina Island based on the weather?
Late fall and winter may offer opportunities to find better accommodation deals than during the peak summer season, although prices vary with holidays, events, and availability. November through February can be appealing if you prefer a quieter visit and do not mind cooler temperatures or occasional rain.
