San Bernardino County
December
Weather in San Bernardino County for December 2024
Your guide to San Bernardino County weather in December - trends and predictions
In general, the average temperature in San Bernardino County at the beginning of December is 20.4 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 13.7 °F by the end of December.
San Bernardino County sees moderate rainfall in December, averaging 6 rainy days.
- New! Chat with our AI weatherman - it’s amazing and free.
25
Dry days
6
Rainy days
0
Snow days
17°/8°
Temperatures
8 km/h
Avg max wind
44 %
Avg humidity
San Bernardino County in December average weather
Move between months or click on a day
| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  16° | ||||||
| 2 19° | 3 22° | 4  23° | 5 25° | 6 21° | 7  17° | 8 17° |
| 9 18° | 10 22° | 11 20° | 12 16° | 13 17° | 14 17° | 15 22° |
| 16 21° | 17 20° | 18  16° | 19  17° | 20 16° | 21  16° | 22  14° |
| 23 16° | 24 16° | 25 15° | 26 15° | 27 14° | 28 16° | 29 16° |
| 30 9° | 31 11° |
You can click on date
Access San Bernardino County weather forecasts with a simple click. Select any date for comprehensive insights on temperature, rainfall, and wind conditions.
Temperatures trend during December in San Bernardino County
See the weather trend as well as the moving average line
December weather day by day
Click on a date for more information
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Dec. 1 | Sunny | 16° /5° | 0 mm | 5 | |
| Dec. 2 | Sunny | 19° /4° | 0 mm | 5 | |
| Dec. 3 | Sunny | 22° /5° | 0 mm | 6 | |
| Dec. 4 | Overcast | 23° /12° | 0 mm | 5 | |
| Dec. 5 | Sunny | 25° /9° | 0 mm | 7 | |
| Dec. 6 | Sunny | 21° /11° | 0 mm | 6 | |
| Dec. 7 | Partly cloudy | 17° /8° | 0 mm | 5 | |
| Dec. 8 | Sunny | 17° /6° | 0 mm | 5 | |
| Dec. 9 | Sunny | 18° /6° | 0 mm | 5 | |
| Dec. 10 | Sunny | 22° /5° | 0 mm | 6 | |
| Dec. 11 | Overcast | 20° /12° | 0 mm | 5 | |
| Dec. 12 | Sunny | 16° /8° | 0 mm | 5 | |
| Dec. 13 | Sunny | 17° /9° | 0 mm | 5 | |
| Dec. 14 | Partly cloudy | 17° /7° | 0 mm | 5 | |
| Dec. 15 | Partly cloudy | 22° /8° | 0 mm | 6 | |
| Dec. 16 | Sunny | 21° /8° | 0 mm | 6 | |
| Dec. 17 | Overcast | 20° /10° | 0 mm | 5 | |
| Dec. 18 | Cloudy | 16° /11° | 0 mm | 4 | |
| Dec. 19 | Light rain shower | 17° /10° | 6.8 mm | 4 | |
| Dec. 20 | Light rain shower | 16° /9° | 10.9 mm | 4 | |
| Dec. 21 | Patchy light rain with thunder | 16° /9° | 5.3 mm | 4 | |
| Dec. 22 | Light rain | 14° /9° | 3.8 mm | 3 | |
| Dec. 23 | Sunny | 16° /6° | 0 mm | 5 | |
| Dec. 24 | Overcast | 16° /9° | 0 mm | 4 | |
| Dec. 25 | Partly cloudy | 15° /7° | 0 mm | 5 | |
| Dec. 26 | Partly cloudy | 15° /8° | 0 mm | 5 | |
| Dec. 27 | Overcast | 14° /8° | 0 mm | 3 | |
| Dec. 28 | Cloudy | 16° /7° | 0 mm | 4 | |
| Dec. 29 | Overcast | 16° /8° | 0 mm | 4 | |
| Dec. 30 | Light rain shower | 9° /7° | 7.9 mm | 2 | |
| Dec. 31 | Light rain shower | 11° /6° | 4.3 mm | 3 | |
| Next | |||||
Important Notice
Our weather forecast for San Bernardino 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 San Bernardino County forecast closer to your planned date for the most up-to-date weather information.
San Bernardino County in December - FAQ
What are the expected maximum and minimum temperatures in San Bernardino County during December?
Enjoy moderate daytime temperatures of up to 17° and cooler nights around 8°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in San Bernardino County during December?
In December, San Bernardino County can expect light to moderate rainfall, totaling 39.1 mm across approximately 6 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in San Bernardino County during December?
The average wind speed in San Bernardino County during December is 8 km/h, suggesting breezy to windy conditions, depending on your activities.
Top locations in San Bernardino County
Select a location for an accurate weather forecast
More Locations Quick links
You are here
Where is San Bernardino County?Get accurate weather forecasts for San Bernardino County, located at latitude 34.108 and longitude -117.29. Stay updated with localized weather information tailored for San Bernardino County.
Found a mistake?
We appreciate your attention to details. Tell us here.