San Francisco weather in December
December in San Francisco: cool, rainy, with clean air — a good time to visit.
#12 of 12 months in San Francisco · #355 of 604 destinations to visit in December · comfort 67/100 (tier C)
Updated June 2026 · climate normals from ERA5 reanalysis
San Francisco climate normals — December
| Daytime high | 14°C / 57°F | 🙂 cool |
|---|---|---|
| Nighttime low | 7°C / 45°F | |
| Feels like (high) | 12°C / 54°F | |
| Rainfall | 126 mm / 5 in | 🌧 rainy |
| Rainy days | 12 days | |
| Humidity | 86% | 💦 very humid |
| Dew point | 8°C / 46°F | |
| Sunshine | 6.3 h/day | |
| Daylight | 9.6 h | |
| Wind | 14 km/h / 9 mph | |
| Air quality (US AQI) | 50 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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San Francisco in December — FAQ
- Is December a good time to visit San Francisco?
- December in San Francisco: cool, rainy, with clean air — a good time to visit. It ranks #12 of 12 months for San Francisco on SeasonMap's comfort score (67/100).
- What is the weather like in San Francisco in December?
- In December, San Francisco averages a daily high of 14.1°C and a low of 7.4°C, with about 126.1 mm of rain over roughly 12 rainy days.
- What is the air quality in San Francisco in December?
- San Francisco has a mean US Air Quality Index of about 50 in December.