Climate almanac
San Marcos
California, United States · 33.14°, -117.17°
What is the weather like in San Marcos in September?
In September, San Marcos is typically 82°F (28°C) during the day and 66°F (19°C) at night. The month brings about 0.4 in (10 mm) of precipitation in total.
- Average high82°F (28°C)
- Average low66°F (19°C)
- Precipitation0.4 in (10 mm)
- Clear or mostly clear days19
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)