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Weather in Riverside for September 2025

Your guide to Riverside weather in September - trends and predictions
  • In general, the average temperature in Riverside 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 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 in September average weather

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Temperatures trend during September in Riverside

See the weather trend as well as the moving average line

September weather day by day

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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 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.

Riverside in September - FAQ

What are the expected maximum and minimum temperatures in Riverside 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 during September?
Rainfall in Riverside 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 during September?
The average wind speed in Riverside during September is 16 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 💧

UV exposure in Riverside during September

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

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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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