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Weather in San Bernardino, California for December 2025

Your guide to San Bernardino weather in December - trends and predictions

    Temperatures

  • So far, December 2025 in San Bernardino is slightly warmer than the historical average by 1.7 °F.

  • Expect cooler weather in the next days in San Bernardino with the forecast suggesting a temperature of 18.3 °F, lower than the historical average.

  • In general, the average temperature in San Bernardino at the beginning of December is 21 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 13.3 °F by the end of December.

    • Rain 🌧️

  • San Bernardino experiences moderate rainfall in December, with an average of 7 rainy days and a total precipitation of 21.6 mm.

    • More

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

Average dry days
24
Dry days
Average rainy days
7
Rainy days
Average snowy days
0
Snow days
Average temperatures
18°/8°
Temperatures
Average wind speed
8 km/h
Avg max wind
Average humidity
38 %
Avg humidity

San Bernardino Weather December

Move between months or click on a day
November
January
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Sunny
20°
2
Sunny
19°
3
Sunny
20°
4
Sunny
21°
5
Sunny
23°
6
Sunny
22°
7
Sunny
22°
8
Sunny
21°
9
Sunny
22°
10
Sunny
24°
11
Overcast
22°
12
Sunny
18°
13
Sunny
18°
14
Partly cloudy
19°
15
Sunny
21°
16
Sunny
23°
17
Sunny
28°
18
Sunny
30°
19
Sunny
23°
20
Sunny
22°
21
Sunny
20°
22
Sunny
22°
23
Patchy rain possible
18°
24
Moderate rain
15°
25
Moderate rain
13°
26
Moderate rain
12°
27
Patchy rain possible
10°
28
Partly cloudy
12°
29
Sunny
14°
30
Sunny
17°
31
Light rain shower
15°

Temperatures trend during December in San Bernardino

See the weather trend as well as the moving average line

December weather in San Bernardino day by day

Click on a date for more information
November January
Date Weather Temperatures Rain UV More
Dec. 1 Sunny
Sunny
 20° /9° 0 mm 5
Dec. 2 Sunny
Sunny
 19° /6° 0 mm 5
Dec. 3 Sunny
Sunny
 20° /7° 0 mm 5
Dec. 4 Sunny
Sunny
 21° /10° 0 mm 5
Dec. 5 Sunny
Sunny
 23° /8° 0 mm 6
Dec. 6 Sunny
Sunny
 22° /10° 0 mm 6
Dec. 7 Sunny
Sunny
 22° /9° 0 mm 6
Dec. 8 Sunny
Sunny
 21° /9° 0 mm 6
Dec. 9 Sunny
Sunny
 22° /9° 0 mm 6
Dec. 10 Sunny
Sunny
 24° /9° 0 mm 6
Dec. 11 Overcast
Overcast
 22° /10° 0 mm 5
Dec. 12 Sunny
Sunny
 18° /9° 0 mm 5
Dec. 13 Sunny
Sunny
 18° /7° 0 mm 5
Dec. 14 Partly cloudy
Partly cloudy
 19° /9° 0 mm 5
Dec. 15 Sunny
Sunny
 21° /8° 0 mm 6
Dec. 16 Sunny
Sunny
 23° /10° 0 mm 6
Dec. 17 Sunny
Sunny
 28° /10° 0 mm 0.7
Dec. 18 Sunny
Sunny
 30° /11° 0 mm 0.7
Dec. 19 Sunny
Sunny
 23° /16° 0 mm 0.6
Dec. 20 Sunny
Sunny
 22° /14° 0 mm 0.6
Dec. 21 Sunny
Sunny
 20° /12° 0 mm 0.6
Dec. 22 Sunny
Sunny
 22° /13° 0 mm 0
Dec. 23 Patchy rain possible
Patchy rain possible
 18° /9° 0.4 mm 3
Dec. 24 Moderate rain
Moderate rain
 15° /12° 8.1 mm 3
Dec. 25 Moderate rain
Moderate rain
 13° /10° 13.1 mm 3
Dec. 26 Moderate rain
Moderate rain
 12° /8° 8.6 mm 2
Dec. 27 Patchy rain possible
Patchy rain possible
 10° /4° 3.3 mm 2
Dec. 28 Partly cloudy
Partly cloudy
 12° /3° 0 mm 3
Dec. 29 Sunny
Sunny
 14° /3° 0 mm 3
Dec. 30 Sunny
Sunny
 17° /2° 0 mm 3
Dec. 31 Light rain shower
Light rain shower
 15° /8° 2.1 mm 4
Next
Important Notice
Our weather forecast for San Bernardino 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 forecast closer to your planned date for the most up-to-date weather information.
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San Bernardino in December - FAQ

What are the expected maximum and minimum temperatures in San Bernardino during December?
Enjoy moderate daytime temperatures of up to 18° 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 during December?
In December, San Bernardino can expect light to moderate rainfall, totaling 21.6 mm across approximately 7 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in San Bernardino during December?
The average wind speed in San Bernardino during December is 8 km/h, suggesting breezy to windy conditions, depending on your activities.

December rainfall patterns in San Bernardino

Explore the daily rainfall trends and prepare for San Bernardinos December weather 💧
Typically, San Bernardino has 7 rainy days in December with a total of 21.6 mm of rainfall.

UV exposure in San Bernardino during December

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

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Location coordinates Where is San Bernardino?

Get accurate weather forecasts for San Bernardino, located at latitude 34.108 and longitude -117.29. Stay updated with localized weather information tailored for San Bernardino.

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