Riverside County (Riverside)
December
Weather in Riverside County, California for December 2025
Your guide to Riverside County weather in December - trends and predictions
So far, December 2025 in Riverside County is slightly warmer than the historical average by 1.1 °F.
Expect cooler weather in the next days in Riverside County with the forecast suggesting a temperature of 19.5 °F, lower than the historical average.
In general, the average temperature in Riverside County at the beginning of December is 21.3 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 14.6 °F by the end of December.
Riverside County experiences moderate rainfall in December, with an average of 7 rainy days and a total precipitation of 23.6 mm.
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Temperatures
Rain 🌧️
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24
Dry days
7
Rainy days
0
Snow days
20°/9°
Temperatures
9 km/h
Avg max wind
41 %
Avg humidity
Riverside County Weather December
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Temperatures trend during December in Riverside County
See the weather trend as well as the moving average line
December weather in Riverside County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Dec. 1 |  Sunny | 20° /8° | 0 mm | 6 | |
| Dec. 2 | Sunny | 19° /6° | 0 mm | 5 | |
| Dec. 3 |  Cloudy | 20° /8° | 0 mm | 5 | |
| Dec. 4 | Sunny | 21° /8° | 0 mm | 5 | |
| Dec. 5 | Sunny | 23° /9° | 0 mm | 6 | |
| Dec. 6 | Sunny | 23° /10° | 0 mm | 6 | |
| Dec. 7 | Sunny | 23° /9° | 0 mm | 6 | |
| Dec. 8 | Sunny | 22° /8° | 0 mm | 6 | |
| Dec. 9 | Sunny | 23° /7° | 0 mm | 6 | |
| Dec. 10 | Sunny | 24° /8° | 0 mm | 6 | |
| Dec. 11 |  Overcast | 23° /10° | 0 mm | 6 | |
| Dec. 12 | Sunny | 19° /10° | 0 mm | 5 | |
| Dec. 13 | Sunny | 20° /8° | 0 mm | 5 | |
| Dec. 14 | Overcast | 21° /11° | 0 mm | 5 | |
| Dec. 15 | Sunny | 23° /10° | 0 mm | 6 | |
| Dec. 16 | Sunny | 24° /11° | 0 mm | 6 | |
| Dec. 17 | Sunny | 25° /9° | 0 mm | 0.7 | |
| Dec. 18 | Sunny | 31° /10° | 0 mm | 0.7 | |
| Dec. 19 | Sunny | 25° /15° | 0 mm | 0.6 | |
| Dec. 20 | Sunny | 23° /12° | 0 mm | 0.6 | |
| Dec. 21 |  Partly cloudy | 21° /14° | 0 mm | 0.6 | |
| Dec. 22 | Sunny | 23° /15° | 0 mm | 0 | |
| Dec. 23 |  Patchy rain possible | 20° /15° | 0.2 mm | 4 | |
| Dec. 24 |  Moderate rain | 17° /15° | 5.1 mm | 4 | |
| Dec. 25 | Moderate rain | 15° /12° | 10.7 mm | 3 | |
| Dec. 26 | Moderate rain | 13° /11° | 6.2 mm | 3 | |
| Dec. 27 | Patchy rain possible | 12° /9° | 4.9 mm | 3 | |
| Dec. 28 | Partly cloudy | 14° /8° | 0 mm | 4 | |
| Dec. 29 | Sunny | 15° /9° | 0 mm | 4 | |
| Dec. 30 | Sunny | 19° /10° | 0 mm | 4 | |
| Dec. 31 |  Moderate rain at times | 14° /9° | 6 mm | 3 | |
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Important Notice
Our weather forecast for Riverside County in December 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.
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Riverside County in December - FAQ
What are the expected maximum and minimum temperatures in Riverside County during December?
Enjoy moderate daytime temperatures of up to 20° and cooler nights around 9°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Riverside County during December?
In December, Riverside County can expect light to moderate rainfall, totaling 23.6 mm across approximately 7 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Riverside County during December?
The average wind speed in Riverside County during December is 9 km/h, suggesting breezy to windy conditions, depending on your activities.
December rainfall patterns in Riverside County
Explore the daily rainfall trends and prepare for Riverside Countys December weather 💧
Typically, Riverside County has 7 rainy days in December with a total of 23.6 mm of rainfall.
UV exposure in Riverside County during December
Stay informed about UV levels for safe outdoor activities throughout the month of December ☀️
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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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