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United States weather

Weather in Riverside, California for September 2026

Your guide to Riverside weather in September - trends and predictions

    Temperatures

  • Until now, September 2026 in Riverside has been nearly identical to the historical average, with a temperature of 35.3 °F (showing only a slight deviation of 0.1 °F).

  • Expect cooler weather in the next days in Riverside with the forecast suggesting a temperature of 32.7 °F, lower than the historical average.

  • In general, the average temperature in Riverside at the beginning of September is 34.6 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 29.9 °F by the end of September.

    • Rain 🌧️

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

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
29
Dry days
Average rainy days
1
Rainy days
Average snowy days
0
Snow days
Average temperatures
31°/19°
Temperatures
Average wind speed
18 km/h
Avg max wind
Average humidity
50 %
Avg humidity

Riverside Weather September

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

Temperatures trend during September in Riverside

See the weather trend as well as the moving average line

September weather in Riverside day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Sunny
Sunny
 35° /20° 0.2 mm 9
Sept. 2 Sunny
Sunny
 34° /21° 0 mm 8
Sept. 3 Sunny
Sunny
 33° /19° 0.6 mm 8
Sept. 4 Sunny
Sunny
 34° /19° 0 mm 9
Sept. 5 Sunny
Sunny
 36° /20° 0 mm 9
Sept. 6 Sunny
Sunny
 34° /22° 2.6 mm 7
Sept. 7 Sunny
Sunny
 36° /21° 0 mm 7
Sept. 8 Sunny
Sunny
 38° /23° 0 mm 9
Sept. 9 Sunny
Sunny
 37° /23° 0.1 mm 9
Sept. 10 Cloudy
Cloudy
 34° /22° 0 mm 8
Sept. 11 Sunny
Sunny
 34° /25° 0 mm 9.2
Sept. 12 Sunny
Sunny
 31° /24° 0 mm 9.2
Sept. 13 Sunny
Sunny
 31° /21° 0 mm 9.2
Sept. 14 Sunny
Sunny
 31° /21° 0 mm 8.9
Sept. 15 Sunny
Sunny
 29° /20° 0 mm 7
Sept. 16 Sunny
Sunny
 29° /20° 0 mm 7
Sept. 17 Sunny
Sunny
 34° /21° 0 mm 8
Sept. 18 Partly cloudy
Partly cloudy
 35° /25° 0 mm 8
Sept. 19 Overcast
Overcast
 35° /26° 0 mm 9
Sept. 20 Overcast
Overcast
 34° /27° 0 mm 8
Sept. 21 Sunny
Sunny
 34° /25° 0 mm 8
Sept. 22 Sunny
Sunny
 34° /25° 0 mm 8
Sept. 23 Overcast
Overcast
 34° /25° 4.6 mm 8
Sept. 24 Sunny
Sunny
 32° /18° 0 mm 8
Sept. 25 Sunny
Sunny
 31° /18° 0 mm 8
Sept. 26 Overcast
Overcast
 29° /16° 0 mm 7
Sept. 27 Partly cloudy
Partly cloudy
 30° /17° 0 mm 7
Sept. 28 Sunny
Sunny
 30° /17° 0 mm 7
Sept. 29 Sunny
Sunny
 30° /17° 0 mm 7
Sept. 30 Light rain shower
Light rain shower
 27° /16° 0.7 mm 6
Next
Important Notice
Our weather forecast for Riverside 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 forecast closer to your planned date for the most up-to-date weather information.
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Riverside in September - FAQ

What are the expected maximum and minimum temperatures in Riverside during September?
Expect warm days with temperatures around 31°, cooling to mild conditions of 19° after sunset. Perfect for those who enjoy warm weather.

How much rainfall should be expected in Riverside during September?
Rainfall in Riverside during September is rare to nonexistent, with the total expected rainfall being less than 10 mm and approximately 1 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 during September?
The average wind speed in Riverside during September is 18 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Riverside

Explore the daily rainfall trends and prepare for Riversides September weather 💧
Typically, Riverside has 1 rainy days in September with a total of 3.9 mm of rainfall.

UV exposure in Riverside during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

Quick links

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Location coordinates Where is Riverside?

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

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