San Francisco weather in August 2026

August in San Francisco is deceptively cool. While the rest of America swelters, the city hovers around 20°C (68°F) during the day and drops to 14°C (57°F) at night—sometimes even colder near the bay. Rain is essentially nonexistent at 0.6mm across the entire month, and you'll get 12.2 hours of sunshine daily. Mornings arrive thick with fog that burns off by midday, leaving crisp, clear afternoons. Locals call August "Fogust" for a reason: the marine layer hugs the coast, making it feel more like late spring than summer. Evenings cool down fast, especially on the waterfront.

August is peak season, but not the chaotic kind. Families are traveling, tourists fill the Golden Gate Bridge viewpoints, and weekend brunch waits stretch past noon. Festivals dot the calendar—the SF International Film Festival runs into early August, and street fairs happen most weekends in the Mission and outer neighborhoods. Prices are at their highest for hotels and restaurants, but the city doesn't feel overwhelmingly crowded compared to July. Locals often escape to wine country or the beach, leaving pockets of the city quieter than you'd expect. Street energy is high but manageable.

Over the past decade, August in San Francisco has remained remarkably consistent. Temperatures haven't shifted significantly, and the fog pattern holds year after year. Climate data shows 2026 tracking with the historical norm—no unusual heat waves or surprise rain events are expected. If anything, the marine influence remains strong, keeping the city cool and dry.

August suits photographers, hikers, and anyone who dislikes extreme heat. Pack layers for 2026 travel: the temperature swing between noon and evening is real. Families with kids do well here because the weather is forgiving and outdoor activities—hiking Lands End, exploring Fisherman's Wharf, walking across the Golden Gate Bridge—are all comfortable. Budget travelers should book accommodation early, as availability tightens fast. Romantics appreciate the moody fog and clear nights perfect for views from Twin Peaks.