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United States weather

Weather in Riverside County for September 2025

Your guide to Riverside County weather in September - trends and predictions

  • In general, the average temperature in Riverside County at the beginning of September is 33.4 °F. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 31.3 °F by the end of September.

  • With an average of 3 rainy days, Riverside County experiences minimal rainfall in September, ensuring that most days remain pleasantly dry.

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Average dry days
27
Dry days
Average rainy days
3
Rainy days
Average snowy days
0
Snow days
Average temperatures
29°/17°
Temperatures
Average wind speed
16 km/h
Avg max wind
Average humidity
54 %
Avg humidity

Riverside County in September average weather

Move between months or click on a day
August
October
Mon.Tue.Wed.Thu.Fri.Sat.Sun.
1
Patchy rain possible
33°
2
Overcast
32°
3
Light rain
31°
4
Cloudy
32°
5
Cloudy
34°
6
Cloudy
36°
7
Sunny
36°
8
Sunny
37°
9
Sunny
38°
10
Cloudy
35°
11
Cloudy
33°
12
Sunny
30°
13
Sunny
30°
14
Sunny
29°
15
Cloudy
28°
16
Partly cloudy
25°
17
Cloudy
24°
18
Overcast
24°
19
Overcast
24°
20
Cloudy
23°
21
Patchy rain possible
24°
22
Overcast
29°
23
Partly cloudy
33°
24
Partly cloudy
32°
25
Sunny
32°
26
Overcast
31°
27
Partly cloudy
32°
28
Sunny
32°
29
Sunny
32°
30
Light rain shower
28°
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Temperatures trend during September in Riverside County

See the weather trend as well as the moving average line

September weather day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Patchy rain possible
Patchy rain possible
 33° /21° 0.5 mm 8
Sept. 2 Overcast
Overcast
 32° /22° 0 mm 8
Sept. 3 Light rain
Light rain
 31° /20° 1.1 mm 8
Sept. 4 Cloudy
Cloudy
 32° /20° 0 mm 8
Sept. 5 Cloudy
Cloudy
 34° /22° 0 mm 8
Sept. 6 Cloudy
Cloudy
 36° /23° 0 mm 9
Sept. 7 Sunny
Sunny
 36° /23° 0 mm 8
Sept. 8 Sunny
Sunny
 37° /25° 0.1 mm 9
Sept. 9 Sunny
Sunny
 38° /26° 0 mm 9
Sept. 10 Cloudy
Cloudy
 35° /25° 0 mm 8
Sept. 11 Cloudy
Cloudy
 33° /22° 0 mm 8
Sept. 12 Sunny
Sunny
 30° /19° 0 mm 8
Sept. 13 Sunny
Sunny
 30° /18° 0 mm 8
Sept. 14 Sunny
Sunny
 29° /17° 0 mm 8
Sept. 15 Cloudy
Cloudy
 28° /16° 0 mm 7
Sept. 16 Partly cloudy
Partly cloudy
 25° /15° 0.1 mm 7
Sept. 17 Cloudy
Cloudy
 24° /13° 0 mm 6
Sept. 18 Overcast
Overcast
 24° /13° 0 mm 6
Sept. 19 Overcast
Overcast
 24° /14° 0 mm 5
Sept. 20 Cloudy
Cloudy
 23° /14° 0 mm 6
Sept. 21 Patchy rain possible
Patchy rain possible
 24° /13° 0 mm 6
Sept. 22 Overcast
Overcast
 29° /14° 0 mm 7
Sept. 23 Partly cloudy
Partly cloudy
 33° /18° 0 mm 9
Sept. 24 Partly cloudy
Partly cloudy
 32° /17° 0 mm 8
Sept. 25 Sunny
Sunny
 32° /17° 0 mm 8
Sept. 26 Overcast
Overcast
 31° /15° 0 mm 8
Sept. 27 Partly cloudy
Partly cloudy
 32° /17° 0 mm 8
Sept. 28 Sunny
Sunny
 32° /17° 0 mm 8
Sept. 29 Sunny
Sunny
 32° /17° 0 mm 8
Sept. 30 Light rain shower
Light rain shower
 28° /16° 1 mm 7
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Important Notice
Our weather forecast for Riverside County 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 Riverside County forecast closer to your planned date for the most up-to-date weather information.

Riverside County in September - FAQ

What are the expected maximum and minimum temperatures in Riverside County during September?
During September, expect a variety of temperatures with highs around 29° and lows near 17°, suitable for diverse activities and preferences.
How much rainfall should be expected in Riverside County during September?
Rainfall in Riverside County during September is rare to nonexistent, with the total expected rainfall being less than 10 mm and approximately 3 days seeing any precipitation. Planning without the concern for rain is generally straightforward during this very dry period.
What are the typical wind conditions in Riverside County during September?
The average wind speed in Riverside County during September is 16 km/h, suggesting breezy to windy conditions, depending on your activities.
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Location coordinates Where is Riverside County?

Get accurate weather forecasts for Riverside County, located at latitude 33.953 and longitude -117.396. Stay updated with localized weather information tailored for Riverside County.

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