easeweather.com
Units
°C
°F
Riverside
Forecast Today Tomorrow
more
California United States
Riverside
AkronAlbuquerqueAnaheimAnchorageArlingtonAtlantaAuroraAuroraAustinBaltimoreBaton RougeBirminghamBostonBrooklynBuffaloCape CoralCharlotteChattanoogaChicagoCincinnatiClevelandColorado SpringsColumbusDallasDenverDes MoinesDetroitEl PasoFayettevilleFort LauderdaleFort WayneGrand RapidsHonoluluHoustonHuntsvilleIndianapolisIrvineJacksonJacksonvilleJamaicaJuneauKansas CityKey WestKnoxvilleLas VegasLexingtonLincolnLittle RockLong BeachLos AngelesLouisvilleMadisonManhattanMemphisMiamiMilwaukeeMinneapolisMobileMontgomeryNashvilleNew OrleansNew York CityNewarkNorfolkOklahoma CityOmahaOrlandoPasadenaPhiladelphiaPhoenixPittsburghPortlandQueensRichmondRiversideSacramentoSalt Lake CitySan AntonioSan DiegoSan FranciscoSan JoseSavannahSeattleShreveportSioux FallsSpringfieldSt. LouisSt. PetersburgTacomaTallahasseeTampaTempeToledoTulsaVancouverVirginia BeachWashingtonWichitaWillmarWorcesterYonkers More Locations
United States weather

Weather in Riverside for September 2025

Your guide to Riverside weather in September - trends and predictions

    Temperatures

  • 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.

    • Rain 🌧️

  • With an average of 2 rainy days, Riverside experiences minimal rainfall in September.

    • More

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

Average dry days
28
Dry days
Average rainy days
2
Rainy days
Average snowy days
0
Snow days
Average temperatures
30°/19°
Temperatures
Average wind speed
17 km/h
Avg max wind
Average humidity
48 %
Avg humidity

Riverside 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°
Select a date

You can click on date

Access Riverside weather forecasts with a simple click. Select any date for comprehensive insights on temperature, rainfall, and wind conditions.
Got it

Temperatures trend during September in Riverside

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
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.

Riverside in September - FAQ

What are the expected maximum and minimum temperatures in Riverside during September?
Expect warm days with temperatures around 30°, 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 2 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 17 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 ☀️

Quick links

You are here
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.

Found a mistake?
We appreciate your attention to details. Tell us here.