San Francisco weather by month

San Francisco’s weather is notoriously unique – often described as having its own microclimate. Forget the stereotypical California sunshine; the city is famous for its cool summers and mild winters. Planning a trip? Or just curious about what to expect throughout the year? This guide breaks down San Francisco’s weather by month, helping you pack appropriately and make the most of your time in this vibrant city.

January: Cool and Wet Beginnings

January falls squarely within San Francisco’s rainy season. Expect cool temperatures, frequent showers, and plenty of gray skies. It’s a cozy month for indoor activities like exploring museums, enjoying the city’s culinary scene, or catching a show. While not cold in the traditional sense, the dampness can make it feel chillier than the thermometer suggests.

February: Continuing the Winter Pattern

February is very similar to January – still rainy, still cool. It’s often the wettest month of the year. However, keep an eye out for occasional sunny breaks! These offer stunning views of the city and a welcome contrast to the prevailing weather. Whale watching season begins to pick up, providing a fantastic outdoor activity if the seas are calm.

March: Transition and Hints of Spring

March marks the beginning of the transition from winter to spring. Rainfall starts to decrease, and temperatures begin a slow climb. You’ll still encounter some rainy days, but there’s a growing chance of sunshine. Wildflowers start to bloom in parks and open spaces, adding a splash of color to the landscape. Layers are still essential!

April: Blossoms and Brisk Air

April is a beautiful month in San Francisco, with blossoming trees and generally pleasant weather. The city shakes off much of the winter gloom, though fog is still a possibility, especially in the mornings and evenings. It’s a fantastic time for walking tours, picnics in Golden Gate Park, and exploring neighborhoods like North Beach and Fisherman’s Wharf.

May: Gray June Begins (Early!)

San Francisco is famous for "Gray May," and it often lives up to its name. May can be surprisingly foggy and cool, even colder than April some years. Don’t be surprised if you need a jacket even during the day. However, the fog can also create a mystical atmosphere, perfect for exploring the city’s iconic landmarks.

June: The Fog Rolls In

June is often the foggiest month, earning it the nickname "Fogust." The marine layer is strong, and it’s common to experience cool, overcast conditions, particularly along the coast. Despite the fog, temperatures are generally mild, and it’s a popular time for outdoor events. Pack layers – you might encounter sunshine and fog in a single day!

July: Summer’s Coolest Embrace

July is one of San Francisco’s warmest months, but “warm” is relative. Expect mild temperatures, often in the 60s and low 70s, and less fog than June. The western parts of the city, closer to the ocean, will remain cooler. It’s a great time for outdoor activities like biking across the Golden Gate Bridge, sailing on the Bay, or attending a festival.

August: Similar to July, with Potential for Heat

August continues the pattern of mild, relatively dry weather. It can sometimes experience a heat wave, pushing temperatures into the 80s, but these are usually short-lived. The fog is less prevalent than in June and July, offering more opportunities for sunshine.

September & October: Indian Summer & Crisp Air

These are arguably the best months to visit San Francisco. September and October often experience an "Indian Summer" – a period of warm, sunny, and dry weather. The fog retreats, and the city basks in golden light. It’s ideal for outdoor adventures, exploring the wine country, and enjoying the city’s vibrant fall festivals. October can get a bit chillier towards the end of the month.

November: Return of the Rain

November marks the return of the rainy season. Temperatures cool down, and the skies become grayer. While not as consistently wet as January and February, you should be prepared for showers. It’s a good time to explore indoor attractions and enjoy the cozy atmosphere of the city.

December: Festive and Mild

December in San Francisco is typically mild and damp. It rarely snows. The city is decorated for the holidays, and there are plenty of festive events. Expect occasional rain showers and cool temperatures, but it’s generally pleasant enough to enjoy outdoor activities.

San Francisco Weather by Month: A Quick Reference Table

Month	Avg High (°F)	Avg Low (°F)	Rainfall (inches)	Humidity (%)
January	57	47	4.2	79
February	60	48	4.5	78
March	62	49	3.1	75
April	66	51	1.8	73
May	68	53	1.1	74
June	70	55	0.7	76
July	72	57	0.3	72
August	73	58	0.3	71
September	75	59	0.4	68
October	72	56	1.6	70
November	64	50	2.8	76
December	58	46	3.9	78

Note: These are average temperatures and rainfall amounts. Actual weather can vary significantly.

Frequently Asked Questions (FAQ)

Q: Does it ever get really hot in San Francisco?
A: Rarely. While heat waves can occur, temperatures above 80°F are uncommon.

Q: What should I pack for a trip to San Francisco?
A: Layers are key! Bring a jacket, sweater, comfortable walking shoes, and an umbrella, regardless of the time of year.

Q: Is San Francisco always foggy?
A: No, but fog is a frequent occurrence, especially during the summer months.

Q: What is the best time of year to visit San Francisco for good weather?
A: September and October consistently offer the warmest and driest weather.

Q: How does the weather in San Francisco compare to Southern California?
A: San Francisco is significantly cooler and foggier than most of Southern California, which enjoys a Mediterranean climate with warm, sunny days.