San Francisco weather in April
April in San Francisco: nice, dry, with clean air — an excellent time to visit.
#7 of 12 months in San Francisco · #123 of 604 destinations to visit in April · comfort 87/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
San Francisco climate normals — April
| Daytime high | 18°C / 64°F | 😎 nice |
|---|---|---|
| Nighttime low | 9°C / 48°F | |
| Feels like (high) | 17°C / 63°F | |
| Rainfall | 16 mm / 0.6 in | ☀️ dry |
| Rainy days | 3 days | |
| Humidity | 73% | 💧 humid |
| Dew point | 7°C / 44°F | |
| Sunshine | 11.2 h/day | |
| Daylight | 13.2 h | |
| Wind | 19 km/h / 12 mph | |
| Air quality (US AQI) | 46 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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San Francisco in April — FAQ
- Is April a good time to visit San Francisco?
- April in San Francisco: nice, dry, with clean air — an excellent time to visit. It ranks #7 of 12 months for San Francisco on SeasonMap's comfort score (87/100).
- What is the weather like in San Francisco in April?
- In April, San Francisco averages a daily high of 17.7°C and a low of 9°C, with about 15.6 mm of rain over roughly 3.2 rainy days.
- What is the air quality in San Francisco in April?
- San Francisco has a mean US Air Quality Index of about 46 in April.