Climate almanac
San Francisco
Heredia Province, Costa Rica · 9.99°, -84.13°
What is the weather like in San Francisco in September?
In September, San Francisco is typically 76°F (25°C) during the day and 64°F (18°C) at night. The month brings about 16 in (416 mm) of precipitation in total.
- Average high76°F (25°C)
- Average low64°F (18°C)
- Precipitation16 in (416 mm)
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)