San Francisco Weather in Fog Season — What to Expect

Overview

San Francisco, USA — summer fog is San Francisco's signature weather — Karl the Fog rolls through the Golden Gate most mornings before burning off by midday. Whether you are planning a holiday or a business trip, understanding the weather helps you pack right and make the most of your time.

Temperature

Daytime highs reach 22°C (72°F) while nights cool to 13°C (55°F). Expect around 9 hours of sunshine per day.

Rainfall

San Francisco sees about 2mm of rainfall across 0 days during this period. Rain is virtually nonexistent — expect clear, dry skies throughout.

Humidity and Comfort

Average humidity sits at 75%. Most visitors find this comfortable, though midday can feel slightly muggy.

What to Pack

• Light layers — t-shirts plus a jacket for cooler evenings
• Sunscreen and sunglasses
• Comfortable walking shoes suited to the terrain

Best Things to Do

• Watch the fog pour over the Golden Gate Bridge from Battery Spencer
• Explore Fisherman's Wharf and sample clam chowder in a sourdough bowl
• Ride a cable car from Union Square to Ghirardelli Square
• Ferry to Alcatraz Island — book weeks in advance

Travel Tips

• Always bring layers; it can be 10 degrees colder near the ocean than inland
• Mark Twain never actually said 'the coldest winter I ever spent was a summer in San Francisco' but the sentiment is real
• Fog typically clears by noon — plan outdoor sightseeing for afternoon

Quick Summary

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Plan your trip with the live San Francisco forecast on Weather Tomorrow.