Siesta Key Weather by Month

Siesta Key, Florida, has a warm, subtropical climate with mild winters, hot summers, and plenty of sunshine throughout the year. Winter and spring are generally drier, making them popular times to enjoy the island’s famous white-sand beaches. Summer brings higher temperatures, warm Gulf waters, increased humidity, and frequent afternoon thunderstorms.

Siesta Key Weather by Month

You can click the image below to view the full-size weather chart for Siesta Key.

January – Mild, Cool and Mostly Dry

Average high: 72°F (22°C)
Average low: 52°F (11°C)
Rainfall: 2.00 inches (50.7 mm)
Water temperature: 64°F (18°C)
Daylight: 10.5 hours

January is one of the coolest months on Siesta Key, although winter weather remains mild compared with much of the United States. Average daytime temperatures reach around 72°F (22°C), while nighttime temperatures fall to approximately 52°F (11°C). The comfortable afternoons are ideal for beach walks, exploring the island, and enjoying outdoor restaurants.

Rainfall averages about 2.00 inches (50.7 mm), making January relatively dry. Gulf water temperatures are around 64°F (18°C), which may feel chilly for swimming. Visitors can still enjoy kayaking, fishing, sightseeing, and relaxing on the sand, but a light jacket is useful during cooler mornings and evenings.

Best for:

Enjoying peaceful beach walks
Exploring the island in mild weather
Fishing and outdoor sightseeing
Escaping colder winter climates

February – Pleasant, Sunny and Comfortable

Average high: 73°F (23°C)
Average low: 55°F (13°C)
Rainfall: 1.70 inches (43.3 mm)
Water temperature: 64°F (18°C)
Daylight: 11 hours

February brings slightly warmer weather and longer days to Siesta Key. Average highs reach 73°F (23°C), while nighttime temperatures average 55°F (13°C). The weather is usually comfortable for spending time outdoors without the intense heat and humidity of summer.

Rainfall averages 1.70 inches (43.3 mm), making February one of the drier months of the year. The Gulf remains relatively cool at around 64°F (18°C), so swimming may be refreshing rather than comfortable for everyone. Beachcombing, boating, cycling, and exploring nearby Sarasota are excellent activities during this time.

Best for:

Enjoying sunny beach days
Taking boat trips and coastal excursions
Exploring Sarasota and local attractions
Spending time outdoors in comfortable temperatures

March – Warm, Sunny and Ideal for Outdoor Activities

Average high: 77°F (25°C)
Average low: 59°F (15°C)
Rainfall: 2.39 inches (60.6 mm)
Water temperature: 68°F (20°C)
Daylight: 12 hours

March marks the arrival of warmer spring weather. Average daytime temperatures rise to 77°F (25°C), while nighttime lows reach approximately 59°F (15°C). Sunshine and comfortable afternoons make this one of the most attractive months for a Siesta Key vacation.

Rainfall increases slightly to 2.39 inches (60.6 mm), but extended periods of rain are not typical. Gulf water temperatures rise to around 68°F (20°C), becoming more inviting for swimming and water sports. Visitors can enjoy beach volleyball, paddleboarding, kayaking, and sunset walks along the coast.

Best for:

Spring beach vacations
Kayaking and paddleboarding
Walking and cycling around the island
Enjoying outdoor dining and sunset views

April – Warm, Bright and Mostly Dry

Average high: 82°F (28°C)
Average low: 63°F (17°C)
Rainfall: 2.19 inches (55.7 mm)
Water temperature: 73°F (23°C)
Daylight: 13 hours

April is one of the most pleasant months to visit Siesta Key, with warm afternoons, comfortable evenings, and plenty of sunshine. Average daytime temperatures reach 82°F (28°C), while nighttime lows average 63°F (17°C). The weather is ideal for spending long hours on the beach and enjoying outdoor activities.

Rainfall remains relatively low at 2.19 inches (55.7 mm), so visitors can generally expect good conditions for sightseeing and recreation. Gulf water temperatures rise to around 73°F (23°C), making swimming more comfortable than in winter. Longer daylight hours also provide more time for boating, beach picnics, and watching the sunset.

Best for:

Swimming and relaxing on the beach
Kayaking, boating, and paddleboarding
Enjoying long, sunny afternoons
Exploring the island before summer humidity increases

May – Hot, Sunny and Increasingly Humid

Average high: 86°F (30°C)
Average low: 68°F (20°C)
Rainfall: 2.44 inches (62 mm)
Water temperature: 79°F (26°C)
Daylight: 13.5 hours

May brings warmer temperatures and the beginning of the transition toward Florida’s hot, humid summer. Average highs reach 86°F (30°C), while nighttime temperatures average 68°F (20°C). The warm weather is excellent for beach vacations, swimming, and water-based activities.

Rainfall averages 2.44 inches (62 mm), so conditions are still relatively dry compared with the summer months. Gulf water temperatures climb to approximately 79°F (26°C), making swimming especially inviting. Visitors should bring sunscreen, drink plenty of water, and plan more strenuous outdoor activities for the morning when possible.

Best for:

Swimming in warm Gulf waters
Enjoying beach vacations before peak summer
Snorkeling, boating, and paddleboarding
Taking advantage of long daylight hours

June – Hot, Humid and Rainy

Average high: 90°F (32°C)
Average low: 73°F (23°C)
Rainfall: 7.26 inches (184.4 mm)
Water temperature: 83°F (28°C)
Daylight: 14 hours

June marks the beginning of Siesta Key’s wetter summer season. Average daytime temperatures reach around 90°F (32°C), and nighttime lows remain near 73°F (23°C). High humidity can make the weather feel even hotter, especially during the afternoon.

Rainfall rises sharply to 7.26 inches (184.4 mm), with approximately 10 rainy days during the month. Showers and thunderstorms often develop in the afternoon, although sunny periods are still common. Gulf water temperatures average around 83°F (28°C), creating excellent conditions for swimming and other water activities. Visitors should remain alert to thunderstorm warnings and avoid the beach during lightning.

Best for:

Swimming in warm ocean water
Enjoying early-morning beach walks
Kayaking and boating during favorable weather
Taking advantage of summer beach activities between showers

July – Very Hot, Humid and Wet

Average high: 90°F (32°C)
Average low: 75°F (24°C)
Rainfall: 7.45 inches (189.2 mm)
Water temperature: 85°F (29°C)
Daylight: 13.5 hours

July is one of the hottest months on Siesta Key, with warm days and humid nights. Average highs reach 90°F (32°C), while nighttime temperatures remain around 75°F (24°C). The combination of heat and humidity can make outdoor activities tiring during the middle of the day.

Rainfall averages 7.45 inches (189.2 mm), and the island experiences approximately 12 rainy days. Afternoon thunderstorms are common, so it is wise to keep outdoor plans flexible. Gulf water temperatures reach about 85°F (29°C), making the sea feel pleasantly warm. However, visitors should watch for lightning, strong currents, and changing weather conditions.

Best for:

Swimming and playing in warm Gulf waters
Enjoying early-morning beach activities
Taking short boat trips when conditions permit
Relaxing indoors during hot afternoons and thunderstorms

August – Hottest, Most Humid and Rainiest

Average high: 91°F (33°C)
Average low: 75°F (24°C)
Rainfall: 9.22 inches (234.3 mm)
Water temperature: 86°F (30°C)
Daylight: 13 hours

August is typically the wettest month on Siesta Key and one of the hottest. Average daytime temperatures reach 91°F (33°C), while nighttime lows remain near 75°F (24°C). High humidity makes the weather feel tropical, and the strongest heat is usually experienced during the afternoon.

Rainfall reaches approximately 9.22 inches (234.3 mm), with around 14 rainy days. Frequent showers and thunderstorms can interrupt beach plans, although they often pass relatively quickly. Gulf water temperatures peak at around 86°F (30°C), providing exceptionally warm swimming conditions. August also falls within the Atlantic hurricane season, so travelers should monitor forecasts and follow local safety advice.

Best for:

Swimming in very warm Gulf waters
Enjoying quieter beach periods between showers
Planning flexible indoor and outdoor activities
Taking advantage of summer vacation opportunities

September – Hot, Humid and Still Rainy

Average high: 90°F (32°C)
Average low: 73°F (23°C)
Rainfall: 6.74 inches (171.1 mm)
Water temperature: 84°F (29°C)
Daylight: 12.5 hours

September remains hot and humid, although temperatures begin to ease slightly toward the end of summer. Average highs reach 90°F (32°C), while nighttime temperatures average 73°F (23°C). Beach conditions can be excellent between periods of rain, but visitors should be prepared for sudden thunderstorms.

Rainfall averages 6.74 inches (171.1 mm), with approximately 10 rainy days. Gulf water temperatures remain warm at around 84°F (29°C), making swimming and water sports attractive. September is also within the peak period of Atlantic hurricane season, so checking weather forecasts before traveling is particularly important.

Best for:

Swimming in warm Gulf waters
Enjoying the beach during sunny periods
Taking advantage of late-summer travel opportunities
Combining beach activities with indoor attractions

October – Warm, More Comfortable and Drier

Average high: 84°F (29°C)
Average low: 68°F (20°C)
Rainfall: 2.64 inches (67.1 mm)
Water temperature: 79°F (26°C)
Daylight: 11.5 hours

October brings a welcome change from the intense heat and frequent rain of summer. Average daytime temperatures fall to 84°F (29°C), while nighttime lows average 68°F (20°C). The weather becomes more comfortable for exploring the island, spending time on the sand, and enjoying outdoor dining.

Rainfall drops to 2.64 inches (67.1 mm), with approximately four rainy days. The Gulf remains warm at around 79°F (26°C), so swimming is still enjoyable. Although the weather generally becomes more settled, October remains part of hurricane season, and visitors should continue monitoring forecasts.

Best for:

Enjoying warm beach days without peak summer heat
Swimming and paddleboarding
Exploring local restaurants and attractions
Taking scenic walks and sunset photographs

November – Mild, Pleasant and Mostly Dry

Average high: 79°F (26°C)
Average low: 61°F (16°C)
Rainfall: 1.57 inches (40 mm)
Water temperature: 73°F (23°C)
Daylight: 11 hours

November brings mild temperatures and drier conditions to Siesta Key. Average highs reach 79°F (26°C), while nighttime temperatures fall to approximately 61°F (16°C). The comfortable weather makes it a great month for visitors who prefer outdoor activities without the intense summer heat.

Rainfall averages just 1.57 inches (40 mm), making November the driest month in the supplied dataset. Gulf water temperatures are around 73°F (23°C), which many visitors find suitable for swimming. Evenings can feel cool, so bringing a light jacket is a good idea for outdoor dinners and waterfront walks.

Best for:

Enjoying peaceful beach walks
Swimming and boating in pleasant conditions
Exploring Sarasota and nearby attractions
Taking a relaxing late-autumn vacation

December – Mild, Comfortable and Relatively Dry

Average high: 73°F (23°C)
Average low: 55°F (13°C)
Rainfall: 2.11 inches (53.6 mm)
Water temperature: 67°F (19°C)
Daylight: 10.5 hours

December brings mild winter weather to Siesta Key, making it an attractive destination for travelers escaping colder climates. Average daytime temperatures reach 73°F (23°C), while nighttime lows fall to around 55°F (13°C). Sunny afternoons are often comfortable for beach walks, sightseeing, and dining outdoors.

Rainfall averages 2.11 inches (53.6 mm), so December is generally much drier than summer. Gulf water temperatures cool to approximately 67°F (19°C), which may feel chilly for extended swimming. Nevertheless, visitors can enjoy the island’s white-sand beaches, fishing, kayaking on suitable days, and beautiful Gulf Coast sunsets.

Best for:

Escaping cold winter weather
Enjoying beach walks and coastal scenery
Exploring local shops and restaurants
Spending the holidays in a mild coastal destination

Siesta Key Weather by Month: Summary

Month	Avg High °F (°C)	Avg Low °F (°C)	Rainfall (inches)	Water temperature (°F)	Daylight (hours)
January	72°F (22°C)	52°F (11°C)	2.00	64°F	10.5
February	73°F (23°C)	55°F (13°C)	1.70	64°F	11.0
March	77°F (25°C)	59°F (15°C)	2.39	68°F	12.0
April	82°F (28°C)	63°F (17°C)	2.19	73°F	13.0
May	86°F (30°C)	68°F (20°C)	2.44	79°F	13.5
June	90°F (32°C)	73°F (23°C)	7.26	83°F	14.0
July	90°F (32°C)	75°F (24°C)	7.45	85°F	13.5
August	91°F (33°C)	75°F (24°C)	9.22	86°F	13.0
September	90°F (32°C)	73°F (23°C)	6.74	84°F	12.5
October	84°F (29°C)	68°F (20°C)	2.64	79°F	11.5
November	79°F (26°C)	61°F (16°C)	1.57	73°F	11.0
December	73°F (23°C)	55°F (13°C)	2.11	67°F	10.5

20 FAQs About Siesta Key Weather

1. What is the best month to visit Siesta Key?

April is one of the best months to visit Siesta Key because temperatures are warm, rainfall is relatively low, and the Gulf of Mexico is becoming more comfortable for swimming. March, May, and November are also excellent options for outdoor activities.

2. What is the weather like in Siesta Key, Florida?

Siesta Key has a warm, subtropical climate with mild winters, hot and humid summers, and frequent summer thunderstorms. Winter and spring are generally drier, while June through September brings the heaviest rainfall.

3. What is the hottest month in Siesta Key?

August is typically one of the hottest months, with an average high of 91°F (33°C) and an average low of 75°F (24°C). High humidity can make it feel even hotter.

4. What is the coldest month in Siesta Key?

January is generally the coldest month, with an average high of 72°F (22°C) and an average low of 52°F (11°C). Days are usually mild, although mornings and evenings can feel cool.

5. What is the rainiest month in Siesta Key?

August is the rainiest month in the supplied weather data, averaging 9.22 inches (234.3 mm) of rainfall. Afternoon showers and thunderstorms are common during summer.

6. What is the driest month in Siesta Key?

November is the driest month in the supplied data, with approximately 1.57 inches (40 mm) of rainfall. February is also relatively dry, averaging 1.70 inches (43.3 mm).

7. When is the best time to swim in Siesta Key?

May through October is generally the best period for swimming because Gulf water temperatures are warm, typically around 79°F to 86°F (26°C to 30°C). June through September offers especially warm water, although thunderstorms may affect beach conditions.

8. What is the average water temperature in Siesta Key?

Gulf water temperatures vary throughout the year, from approximately 64°F (18°C) in January and February to around 86°F (30°C) in August. The water is generally warmest in summer and early fall.

9. Is Siesta Key warm in January?

Yes. January has an average high of 72°F (22°C) and an average low of 52°F (11°C). It is comfortable for beach walks, sightseeing, and outdoor dining, although the Gulf water may feel cold for swimming.

10. Is Siesta Key hot in the summer?

Yes. Summer temperatures typically reach 90°F to 91°F (32°C to 33°C), with nighttime lows around 73°F to 75°F (23°C to 24°C). High humidity makes summer feel hotter, so morning and evening activities are often more comfortable.

11. Does it rain every day in Siesta Key during summer?

No. Although summer is the wettest season, it does not necessarily rain all day. Many days have sunshine followed by brief afternoon or evening thunderstorms. However, prolonged rainy periods can occur.

12. How many sunny days does Siesta Key get?

Siesta Key enjoys abundant sunshine throughout the year, particularly during winter and spring. Summer also has sunny periods, but cloud cover and afternoon thunderstorms are more frequent. The exact number of sunny days depends on the weather station and the definition of a sunny day.

13. Does Siesta Key get hurricanes?

Yes. Siesta Key is on Florida’s Gulf Coast and can be affected by tropical storms and hurricanes. The Atlantic hurricane season runs from June 1 through November 30, with the greatest activity typically occurring from August through October. Visitors should monitor forecasts during this period.

14. Is October a good time to visit Siesta Key?

Yes. October is a pleasant month to visit, with an average high of 84°F (29°C), an average low of 68°F (20°C), and approximately 2.64 inches (67.1 mm) of rainfall. Gulf water temperatures remain warm at around 79°F (26°C), although hurricane-season risks remain.

15. Is November a good time to visit Siesta Key?

Yes. November offers mild temperatures, relatively little rain, and comfortable conditions for outdoor activities. Average highs reach 79°F (26°C), and rainfall averages only 1.57 inches (40 mm). The Gulf water is cooler than in summer but may still be suitable for swimming.

16. What is the weather like in Siesta Key in December?

December is mild and relatively dry. Average highs are around 73°F (23°C), while average lows are approximately 55°F (13°C). It is a good month for beach walks, sightseeing, and holiday vacations, although evenings may require a light jacket.

17. What should I wear in Siesta Key?

Lightweight clothing, shorts, T-shirts, sandals, swimwear, sunglasses, and sunscreen are useful for most of the year. During summer, bring breathable clothing and rain protection. In winter, pack a light jacket or sweater for cooler mornings and evenings.

18. Is Siesta Key humid?

Yes. Humidity is especially noticeable from June through September, when temperatures are high and frequent rainfall contributes to muggy conditions. Winter and spring generally feel more comfortable for visitors who prefer less intense heat.

19. How many hours of daylight does Siesta Key get?

Daylight ranges from approximately 10.5 hours per day in January and December to around 14 hours in June. Longer summer days provide more time for swimming, boating, sightseeing, and enjoying the beach.

20. What is the cheapest time to visit Siesta Key based on the weather?

Late summer and early fall may offer opportunities to find lower accommodation rates than during popular winter and spring periods. However, June through September is hotter, wetter, and more humid, while hurricane-season weather can affect travel plans. Compare accommodation prices and cancellation policies before booking.