United States · 1991–2020 normal
Grass Valley in
September.
Typical September weather in Grass Valley: 28°C by day, 11.2°C at night, 11 mm of rain over 1.3 wet days. These are measured 1991–2020 station normals, not a forecast.
Typical high28°C
Typical low11.2°C
Rain11 mm
Wet days1.3
Comfort score 80 this month (June leads the year at 84). Daylight is calculated as 12 h 24 from latitude 39.22°.
The evidence behind this page
One month,
from the same station.
- Place identity
- GeoNames 5353775
- NOAA station
- USC00043573 · GRASS VALLEY #2
- Station distance
- 1.8 km from the place centre
- Coverage
- Strong coverage · 30 usable years
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.