Normal weather in Grass Valley in September
The weather in Grass Valley in September has an average temperature of around 27°C during the day. On average, September sees 9,9 mm of rain in Grass Valley. The wind speed is 3 Beaufort and mainly comes from South.
After August, September in Grass Valley starts with a temperature of 30°C and ends around October at 22°C.
September averages for Grass Valley
 Average temperature | 27°C |
 Highest daytime temperature | 31°C |
| Lowest daytime temperature | 22°C |
 Total rainfall | 9,9 mm |
| Rainy days | 6 days |
Temperature per day in September in Grass Valley
This graph shows the average daily maximum temperatures in September in Grass Valley, indicated in degrees Celsius.
Precipitation per day in September in Grass Valley
This graph shows the average daily precipitation in September in Grass Valley, indicated in millimeters.
UV index per day in September in Grass Valley
This graph shows the average daily UV index in September in Grass Valley.
Yearly temperature in September in Grass Valley
This graph shows the average yearly temperature in September in Grass Valley, measured in degrees Celsius, over the past years.
Yearly total precipitation in September in Grass Valley
This graph shows the average yearly precipitation in millimeters in September in Grass Valley, over the past years.
Average daily weather in September
Click on a day to get more information about the average weather on that day.
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Average weather in Grass Valley per month
Click on a month below to see in detail how the weather typically is in Grass Valley and what to expect. Based on the historical weather data of Grass Valley, you can view the average temperature, precipitation, wind, and UV index for each day of the month.