San Francisco weather in August
August in San Francisco: warm, dry, with clean air — an excellent time to visit.
#3 of 12 months in San Francisco · #18 of 604 destinations to visit in August · comfort 94/100 (tier S)
Updated June 2026 · climate normals from ERA5 reanalysis
San Francisco climate normals — August
| Daytime high | 24°C / 74°F | 🌤 warm |
|---|---|---|
| Nighttime low | 14°C / 57°F | |
| Feels like (high) | 24°C / 75°F | |
| Rainfall | 0 mm / 0 in | ☀️ dry |
| Rainy days | 0 days | |
| Humidity | 78% | 💦 very humid |
| Dew point | 13°C / 56°F | |
| Sunshine | 12.4 h/day | |
| Daylight | 13.6 h | |
| Wind | 17 km/h / 11 mph | |
| Air quality (US AQI) | 35 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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San Francisco in August — FAQ
- Is August a good time to visit San Francisco?
- August in San Francisco: warm, dry, with clean air — an excellent time to visit. It ranks #3 of 12 months for San Francisco on SeasonMap's comfort score (94/100).
- What is the weather like in San Francisco in August?
- In August, San Francisco averages a daily high of 23.5°C and a low of 14°C, with about 0.3 mm of rain over roughly 0.2 rainy days.
- What is the air quality in San Francisco in August?
- San Francisco has a mean US Air Quality Index of about 35 in August.