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Weather in Grass Valley, California for September 2027

Your guide to Grass Valley weather in September - trends and predictions

    Rain 🌧️

  • Precipitation in Grass Valley during September is a rare event, with an average of fewer than 2 rainy days.

    • More

  • Is September a good time to visit Grass Valley? check out the best time to travel to Grass Valley page.

  • ✨ Is September a good time to visit Grass Valley? – Ask the AI Weatherman

Average dry days
29
Dry days
Average rainy days
1
Rainy days
Average snowy days
0
Snow days
Average temperatures
27°/16°
Temperatures
Average wind speed
14 km/h
Avg max wind
Average humidity
41 %
Avg humidity

Grass Valley Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Sunny
31°
2
Sunny
28°
3
Sunny
27°
4
Moderate rain
29°
5
Sunny
28°
6
Sunny
28°
7
Sunny
29°
8
Sunny
31°
9
Thundery outbreaks possible
29°
10
Thundery outbreaks possible
27°
11
Cloudy
28°
12
Sunny
29°
13
Sunny
25°
14
Sunny
28°
15
Sunny
30°
16
Sunny
29°
17
Sunny
28°
18
Overcast
26°
19
Overcast
24°
20
Sunny
28°
21
Partly cloudy
27°
22
Sunny
28°
23
Sunny
32°
24
Cloudy
31°
25
Overcast
25°
26
Sunny
28°
27
Sunny
26°
28
Partly cloudy
23°
29
Overcast
25°
30
Overcast
24°

Temperatures trend during September in Grass Valley

See the weather trend as well as the moving average line

September weather in Grass Valley day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Sunny
Sunny
 31° /17° 0 mm 8
Sept. 2 Sunny
Sunny
 28° /17° 0.1 mm 7
Sept. 3 Sunny
Sunny
 27° /17° 0.2 mm 7
Sept. 4 Moderate rain
Moderate rain
 29° /18° 12.3 mm 6
Sept. 5 Sunny
Sunny
 28° /16° 0 mm 8.2
Sept. 6 Sunny
Sunny
 28° /16° 0 mm 8
Sept. 7 Sunny
Sunny
 29° /16° 0 mm 8
Sept. 8 Sunny
Sunny
 31° /17° 0 mm 7.9
Sept. 9 Thundery outbreaks possible
Thundery outbreaks possible
 29° /17° 0 mm 4
Sept. 10 Thundery outbreaks possible
Thundery outbreaks possible
 27° /17° 0 mm 7
Sept. 11 Cloudy
Cloudy
 28° /17° 0 mm 7
Sept. 12 Sunny
Sunny
 29° /16° 0 mm 7.5
Sept. 13 Sunny
Sunny
 25° /15° 0 mm 7.4
Sept. 14 Sunny
Sunny
 28° /15° 0 mm 7.3
Sept. 15 Sunny
Sunny
 30° /16° 0 mm 7.3
Sept. 16 Sunny
Sunny
 29° /18° 0 mm 7.2
Sept. 17 Sunny
Sunny
 28° /16° 0 mm 7.1
Sept. 18 Overcast
Overcast
 26° /17° 0 mm 7
Sept. 19 Overcast
Overcast
 24° /16° 0 mm 6
Sept. 20 Sunny
Sunny
 28° /17° 0 mm 4
Sept. 21 Partly cloudy
Partly cloudy
 27° /17° 0 mm 6
Sept. 22 Sunny
Sunny
 28° /17° 0 mm 6.6
Sept. 23 Sunny
Sunny
 32° /19° 0 mm 6.5
Sept. 24 Cloudy
Cloudy
 31° /20° 0 mm 6
Sept. 25 Overcast
Overcast
 25° /18° 0 mm 6
Sept. 26 Sunny
Sunny
 28° /16° 0 mm 5
Sept. 27 Sunny
Sunny
 26° /18° 0 mm 5
Sept. 28 Partly cloudy
Partly cloudy
 23° /13° 0 mm 6
Sept. 29 Overcast
Overcast
 25° /15° 0 mm 5
Sept. 30 Overcast
Overcast
 24° /16° 0 mm 5
Next
Important Notice
Our weather forecast for Grass Valley in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Grass Valley forecast closer to your planned date for the most up-to-date weather information.
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Grass Valley in September - FAQ

What are the expected maximum and minimum temperatures in Grass Valley during September?
During September, expect a variety of temperatures with highs around 27° and lows near 16°, suitable for diverse activities and preferences.

How much rainfall should be expected in Grass Valley during September?
Expect minimal rainfall in Grass Valley during September, with a total of 12.6 mm over approximately 1 days. This minimal precipitation is unlikely to significantly impact plans.

What are the typical wind conditions in Grass Valley during September?
The average wind speed in Grass Valley during September is 14 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Grass Valley

Explore the daily rainfall trends and prepare for Grass Valleys September weather 💧
Typically, Grass Valley has 1 rainy days in September with a total of 12.6 mm of rainfall.

UV exposure in Grass Valley during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Location coordinates Where is Grass Valley?

Get accurate weather forecasts for Grass Valley, located at latitude 39.219 and longitude -121.061. Stay updated with localized weather information tailored for Grass Valley.

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