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United States weather

Weather in San Bernardino County, California for December 2026

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

    Snow Forecast ❄️

  • With an average of 5 snowy days, San Bernardino County usually enjoys a light touch of snow in December.

    • Temperatures

  • In general, the average temperature in San Bernardino County at the beginning of December is 11.6 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 8.1 °F by the end of December.

    • More

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

Average dry days
25
Dry days
Average rainy days
1
Rainy days
Average snowy days
5
Snow days
Average temperatures
12°/6°
Temperatures
Average wind speed
13 km/h
Avg max wind
Average humidity
41 %
Avg humidity

San Bernardino County Weather December

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

Temperatures trend during December in San Bernardino County

See the weather trend as well as the moving average line

December weather in San Bernardino County day by day

Click on a date for more information
November January
Date Weather Temperatures Rain Snow More
Dec. 1 Sunny
Sunny
 11° /6° 0 mm 0 cm
Dec. 2 Overcast
Overcast
 12° /7° 0 mm 0 cm
Dec. 3 Overcast
Overcast
 9° /5° 0 mm 0 cm
Dec. 4 Sunny
Sunny
 10° /4° 0 mm 0 cm
Dec. 5 Sunny
Sunny
 12° /6° 0 mm 0 cm
Dec. 6 Sunny
Sunny
 13° /6° 0 mm 0 cm
Dec. 7 Sunny
Sunny
 14° /8° 0 mm 0 cm
Dec. 8 Partly cloudy
Partly cloudy
 13° /7° 0 mm 0 cm
Dec. 9 Sunny
Sunny
 12° /4° 0 mm 0 cm
Dec. 10 Sunny
Sunny
 12° /6° 0 mm 0 cm
Dec. 11 Overcast
Overcast
 16° /8° 0 mm 0 cm
Dec. 12 Partly cloudy
Partly cloudy
 12° /6° 0 mm 0 cm
Dec. 13 Partly cloudy
Partly cloudy
 12° /4° 0 mm 0 cm
Dec. 14 Overcast
Overcast
 13° /7° 0 mm 0 cm
Dec. 15 Sunny
Sunny
 12° /5° 0 mm 0 cm
Dec. 16 Overcast
Overcast
 15° /7° 0 mm 0 cm
Dec. 17 Partly cloudy
Partly cloudy
 14° /7° 0 mm 0 cm
Dec. 18 Sunny
Sunny
 16° /7° 0 mm 0 cm
Dec. 19 Overcast
Overcast
 15° /9° 0 mm 0 cm
Dec. 20 Partly cloudy
Partly cloudy
 15° /9° 0 mm 0 cm
Dec. 21 Overcast
Overcast
 14° /7° 0 mm 0 cm
Dec. 22 Overcast
Overcast
 14° /7° 0 mm 0 cm
Dec. 23 Partly cloudy
Partly cloudy
 12° /5° 0.8 mm 0 cm
Dec. 24 Moderate rain at times
Moderate rain at times
 8° /2° 89.2 mm 0.7 cm
Dec. 25 Partly cloudy
Partly cloudy
 5° /1° 11.3 mm 0.7 cm
Dec. 26 Overcast
Overcast
 6° /2° 10.9 mm 6.9 cm
Dec. 27 Sunny
Sunny
 8° /0° 1.4 mm 1 cm
Dec. 28 Partly cloudy
Partly cloudy
 9° /2° 0 mm 0 cm
Dec. 29 Sunny
Sunny
 10° /3° 0 mm 0 cm
Dec. 30 Sunny
Sunny
 8° /3° 13.4 mm 9.2 cm
Dec. 31 Cloudy
Cloudy
 11° /5° 13.9 mm 0 cm
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.
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San Bernardino County in December - FAQ

What are the expected maximum and minimum temperatures in San Bernardino County during December?
During December, expect a variety of temperatures with highs around 12° and lows near 6°, suitable for diverse activities and preferences.

How much rainfall should be expected in San Bernardino County during December?
Significant rainfall exceeding 141 mm is expected in San Bernardino County during December, occurring over more than 1 days. Preparing for wet conditions is recommended in your planning.

Will it snow in San Bernardino County in December 2026?
San Bernardino County experiences an average snowfall of 18.5 cm during December, occurring over 5 days.

What are the typical wind conditions in San Bernardino County during December?
The average wind speed in San Bernardino County during December is 13 km/h, suggesting breezy to windy conditions, depending on your activities.

San Bernardino County snow forecast December 2026

Track daily snowfall levels and discover San Bernardino County’s snowy potential this December ❄️
On average, San Bernardino County sees 5 snowy days during December, with approximately 18.5 cm of total snowfall.

December rainfall patterns in San Bernardino County

Explore the daily rainfall trends and prepare for San Bernardino Countys December weather 💧
Typically, San Bernardino County has 1 rainy days in December with a total of 141 mm of rainfall.
Top locations in San Bernardino County
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Big Bear LakeFontanaOntarioRancho CucamongaSan Bernardino
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Location coordinates Where is San Bernardino County?

Get accurate weather forecasts for San Bernardino County, located at latitude 34.244 and longitude -116.911. Stay updated with localized weather information tailored for San Bernardino County.

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