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United StatesThe weather in September in Riverside
It's hot in September in Riverside with an average temperature of 33°C. Temperatures this month range from a low of 31°C to a high of 36°C. At night, you can expect temperatures between 16°C and 20°C.
September is a good month to be in Riverside for sunny weather. You’ll have high temperatures and not too much rain.
Average temperatures and precipitation
This chart shows the average daily maximum and minimum temperatures (in degrees Celsius) and precipitation (in millimeters) in September for Riverside, California. A low precipitation value usually indicates little to no rainfall on that day in recent years, while a higher value suggests more frequent rainfall.
Temperature records
With 47°C in 2020, Riverside reached the highest temperature in September over the past 10 years. The lowest daytime temperature in this month was 21°C in 2023. The extreme nighttime temperatures ranged from a lowest recorded value of 10°C to a highest value of 27°C.
Rainfall amount
According to weather history, there is only 7,1 mm of precipitation in September. The wind speed is around 4 Bft, mostly coming from the West.
Daily weather in September for Riverside
Click on any day in September to get detailed info about the usual weather on that day in Riverside. Check out the historical temperatures and precipitation over the past 10 years on this day.
September weather comparison
| Riverside | New York | |
|---|---|---|
| Average temperature | 33°C | 27°C |
| Max. temperature | 36°C | 31°C |
| Min. temperature | 16°C | -5°C |
| Total precipitation | 7,1 mm | 57 mm |
| Rainy days | 2 days | 9 days |
Start of September
The month of September starts in Riverside with hot temps, averaging around 35°C during the day and nights around 20°C.
Mid September
By mid-September, daytime temps drop to around 33°C, with nights around 19°C. Not much precipitation expected during this period. It’s mostly dry and sunny.
End of September
By the end of September, the average daytime temperature in Riverside is around 33°C, while nighttime temps are about 18°C. No precipitation expected at the end of the month; it’ll be mostly sunny.
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UV index
The UV index is a maximum of 8 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.
Check out the climate of Riverside for all months and discover the best travel time
Temperature charts
These charts show the average temperatures in September in Riverside, California. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in September in Riverside
Temperature in September in Riverside over the years
Precipitation charts
These charts show the average amount of precipitation in September in Riverside, California. Precipitation is always measured as water, even when it falls as snow or hail The amount of precipitation is displayed in millimeters, while snowfall is shown in centimeters.
Daily Precipitation in September in Riverside
Total precipitation in September in Riverside over the years
Daily UV index in September in Riverside
This chart shows the average daily UV index in September in Riverside, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Weather experiences in September in Riverside
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Average weather in Riverside by month
Click on a month below to see detailed weather info for Riverside. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.