San Francisco Weather by Month: A Complete Guide for Travelers
San Francisco’s weather is famously unique—and often misunderstood. Thanks to its coastal location, cold Pacific currents, and rolling hills, the city experiences mild temperatures year-round, frequent fog, and microclimates that can make one neighborhood sunny while another is chilly and gray.
If you’re planning a trip, understanding San Francisco weather by month will help you pack smart, choose the best time to visit, and avoid surprises. This guide breaks down what to expect each month, including temperatures, fog, rainfall, and travel tips.
Overview of San Francisco’s Climate
- Climate type: Mediterranean (cool-summer)
- Average annual temperature: 50–65°F (10–18°C)
- Rainy season: November to March
- Dry season: April to October
- Foggiest months: June to August
Unlike many cities, San Francisco’s summers are cooler than its spring and fall, and extreme heat or cold is rare.
San Francisco Weather by Month
| Month | Avg High °F (°C) | Avg Low °F (°C) | Rainfall | Fog Level |
|---|---|---|---|---|
| January | 57°F (14°C) | 46°F (8°C) | High | Low |
| February | 60°F (16°C) | 48°F (9°C) | Moderate–High | Low |
| March | 61°F (16°C) | 49°F (9°C) | Moderate | Low |
| April | 63°F (17°C) | 50°F (10°C) | Low | Low |
| May | 64°F (18°C) | 51°F (11°C) | Very Low | Medium |
| June | 66°F (19°C) | 53°F (12°C) | Very Low | High |
| July | 67°F (19°C) | 54°F (12°C) | None | Very High |
| August | 68°F (20°C) | 55°F (13°C) | None | Very High |
| September | 70°F (21°C) | 56°F (13°C) | Very Low | Low |
| October | 69°F (21°C) | 55°F (13°C) | Low | Low |
| November | 63°F (17°C) | 51°F (11°C) | Moderate | Low |
| December | 57°F (14°C) | 46°F (8°C) | High | Low |
January: Cool and Rainy
- Average high: 57°F (14°C)
- Average low: 46°F (8°C)
- Rainfall: High
January is one of the wettest months in San Francisco. Expect cloudy days, occasional storms, and cool temperatures. While it’s not ideal for sightseeing outdoors, it’s a good time for museums, cafés, and fewer crowds.
Travel tip: Bring a waterproof jacket and layers.
February: Mild with Lingering Rain
- Average high: 60°F (16°C)
- Average low: 48°F (9°C)
- Rainfall: Moderate to high
February starts to dry out slightly, though rain is still common. Days gradually become sunnier toward the end of the month, and crowds remain low.
Travel tip: Great month for budget travelers and city exploration.
March: Transition to Spring
- Average high: 61°F (16°C)
- Average low: 49°F (9°C)
- Rainfall: Moderate
March marks the transition from winter to spring. Rainfall decreases, flowers begin to bloom, and temperatures slowly rise. Weather can be unpredictable, with a mix of sun and showers.
Travel tip: Pack layers and a light rain jacket.
April: Pleasant and Fresh
- Average high: 63°F (17°C)
- Average low: 50°F (10°C)
- Rainfall: Low
April is one of the best months to visit San Francisco. The weather is mild, skies are clearer, and fog is minimal. Outdoor attractions like Golden Gate Park shine during this time.
Travel tip: Ideal for walking tours and photography.
May: Sunny and Comfortable
- Average high: 64°F (18°C)
- Average low: 51°F (11°C)
- Rainfall: Very low
May offers comfortable temperatures and more sunshine. While coastal fog begins to appear late in the month, it’s generally a great time for sightseeing.
Travel tip: Light sweaters are still useful, especially in the evenings.
June: Cool with Increasing Fog
- Average high: 66°F (19°C)
- Average low: 53°F (12°C)
- Rainfall: Minimal
Despite being summer, June is cooler than expected. Fog becomes more frequent, especially in the mornings and evenings. Inland areas may still be sunny.
Travel tip: Don’t assume summer means warm—bring layers.
July: Foggy and Cool
- Average high: 67°F (19°C)
- Average low: 54°F (12°C)
- Rainfall: None
July is one of the foggiest months in San Francisco. Coastal areas can feel chilly and windy, while neighborhoods farther from the ocean are warmer.
Travel tip: A jacket or hoodie is essential, even during the day.
August: Similar to July
- Average high: 68°F (20°C)
- Average low: 55°F (13°C)
- Rainfall: None
August continues the cool summer trend with persistent fog. Tourists are plentiful, and popular attractions can be crowded despite the cool weather.
Travel tip: Plan activities inland for warmer afternoons.
September: Warmest Month of the Year
- Average high: 70°F (21°C)
- Average low: 56°F (13°C)
- Rainfall: Very low
September is often the warmest and sunniest month in San Francisco. Fog retreats, skies clear, and temperatures are ideal for outdoor adventures.
Travel tip: One of the best months to visit—book early.
October: Warm Days, Cool Nights
- Average high: 69°F (21°C)
- Average low: 55°F (13°C)
- Rainfall: Low
October offers beautiful weather with fewer crowds. Days are warm and sunny, while evenings are crisp. It’s a favorite month among locals.
Travel tip: Perfect for festivals, hikes, and coastal views.
November: Cooler with Returning Rain
- Average high: 63°F (17°C)
- Average low: 51°F (11°C)
- Rainfall: Moderate
November signals the start of the rainy season. Temperatures drop slightly, and cloudy days become more common.
Travel tip: A good mix of indoor and outdoor activities works best.
December: Cool and Festive
- Average high: 57°F (14°C)
- Average low: 46°F (8°C)
- Rainfall: High
December is cool, often wet, and festive. Holiday decorations brighten the city, and tourist numbers are moderate.
Travel tip: Pack warm layers and enjoy seasonal events.
Best Time to Visit San Francisco
- Best overall weather: September and October
- Best budget months: January, February
- Best for outdoor activities: April, May, September
What to Pack for San Francisco (Any Month)
- Layers (T-shirts, sweaters, light jackets)
- Comfortable walking shoes
- Windproof or waterproof jacket
- Sunglasses (even on foggy days)
San Francisco Weather FAQs
- What is the best month to visit San Francisco?
September and October are considered the best months due to warm temperatures, minimal fog, and low rainfall. - Does San Francisco have four seasons?
San Francisco has mild seasons but not traditional four seasons. Weather changes are subtle throughout the year. - Is summer in San Francisco hot?
No, summers are cool. Temperatures often range between 60–70°F (16–21°C), with frequent fog. - Why is San Francisco so foggy in summer?
Cold Pacific Ocean currents pull moist air inland, creating fog, especially from June to August. - What is the coldest month in San Francisco?
January is typically the coldest month, with the lowest average nighttime temperatures. - What is the warmest month in San Francisco?
September is usually the warmest month, offering the most sunshine and least fog. - Does it snow in San Francisco?
Snow is extremely rare and almost never occurs in the city. - When is the rainy season in San Francisco?
The rainy season runs from November through March. - How much rain does San Francisco get annually?
San Francisco averages about 20–25 inches (510–635 mm) of rain per year. - Is San Francisco weather good for walking tours?
Yes, mild temperatures year-round make it ideal for walking, especially in spring and fall. - What should I pack for San Francisco weather?
Pack layers, a light jacket, comfortable shoes, and a windproof or waterproof coat. - Is San Francisco colder than Los Angeles?
Yes, San Francisco is generally cooler and foggier than Los Angeles throughout the year. - Does fog affect sightseeing in San Francisco?
Fog can obscure views, especially of the Golden Gate Bridge, but it often clears by afternoon. - Are evenings cold in San Francisco?
Yes, evenings can be chilly year-round, even during summer months. - Is spring a good time to visit San Francisco?
Yes, spring (April–May) offers mild weather, fewer crowds, and blooming landscapes. - Which months have the least fog in San Francisco?
September, October, and April typically have the least fog. - Can you visit San Francisco year-round?
Yes, San Francisco is a year-round destination thanks to its mild climate. - Does San Francisco experience heat waves?
Heat waves are rare but can occur, usually in late summer or early fall. - How windy is San Francisco?
The city can be quite windy, especially near the coast and during summer afternoons. - Is San Francisco weather predictable?
Weather can change quickly due to microclimates, so checking daily forecasts is recommended.
Final Thoughts
San Francisco’s weather by month is consistently mild but full of surprises. The key to enjoying your trip is understanding that layers are essential year-round and that summer doesn’t always mean heat. With the right preparation, any month can be a great time to explore this iconic city.
