San Bernardino County (Ontario)
January
Weather in San Bernardino County, California for January 2026
Your guide to San Bernardino County weather in January - trends and predictions
In general, the average temperature in San Bernardino County at the beginning of January is 16.6 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 15.7 °F by the end of January.
San Bernardino County experiences moderate rainfall in January, with an average of 7 rainy days and a total precipitation of 47.9 mm.
New! Chat with our AI weatherman - it’s amazing and free.
Temperatures
Rain 🌧️
More
24
Dry days
7
Rainy days
0
Snow days
16°/7°
Temperatures
11 km/h
Avg max wind
44 %
Avg humidity
San Bernardino County Weather January
Move between months or click on a day
Temperatures trend during January in San Bernardino County
See the weather trend as well as the moving average line
January weather in San Bernardino County day by day
Click on a date for more information
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Jan. 1 |  Partly cloudy | 18° /8° | 0 mm | 5 | |
| Jan. 2 |  Overcast | 20° /8° | 0 mm | 5 | |
| Jan. 3 |  Light rain shower | 15° /7° | 4.5 mm | 4 | |
| Jan. 4 | Overcast | 16° /3° | 0 mm | 4 | |
| Jan. 5 | Partly cloudy | 17° /9° | 0 mm | 5 | |
| Jan. 6 |  Sunny | 17° /10° | 0 mm | 5 | |
| Jan. 7 | Patchy rain possible | 13° /5° | 1 mm | 3 | |
| Jan. 8 |  Cloudy | 14° /6° | 0.2 mm | 4 | |
| Jan. 9 | Sunny | 17° /6° | 0 mm | 5 | |
| Jan. 10 | Sunny | 16° /5° | 0 mm | 5 | |
| Jan. 11 | Patchy rain possible | 15° /3° | 0 mm | 4 | |
| Jan. 12 | Sunny | 15° /4° | 0 mm | 5 | |
| Jan. 13 | Sunny | 14° /7° | 0 mm | 4 | |
| Jan. 14 | Sunny | 15° /6° | 0 mm | 5 | |
| Jan. 15 | Cloudy | 17° /9° | 0 mm | 5 | |
| Jan. 16 | Sunny | 19° /7° | 0 mm | 5 | |
| Jan. 17 | Partly cloudy | 13° /4° | 0 mm | 4 | |
| Jan. 18 | Sunny | 17° /6° | 0 mm | 5 | |
| Jan. 19 | Overcast | 18° /9° | 0 mm | 5 | |
| Jan. 20 | Light rain shower | 15° /6° | 2.2 mm | 4 | |
| Jan. 21 | Light rain shower | 12° /6° | 5.6 mm | 3 | |
| Jan. 22 | Light rain shower | 16° /9° | 14.1 mm | 4 | |
| Jan. 23 | Patchy rain possible | 16° /7° | 0 mm | 4 | |
| Jan. 24 | Overcast | 18° /7° | 0 mm | 5 | |
| Jan. 25 | Patchy rain possible | 14° /6° | 0 mm | 4 | |
| Jan. 26 | Sunny | 13° /5° | 10.4 mm | 4 | |
| Jan. 27 | Sunny | 16° /8° | 9.8 mm | 4 | |
| Jan. 28 | Overcast | 16° /7° | 0 mm | 4 | |
| Jan. 29 | Overcast | 16° /6° | 0 mm | 4 | |
| Jan. 30 | Overcast | 17° /7° | 0 mm | 4 | |
| Jan. 31 | Partly cloudy | 18° /7° | 0 mm | 5 | |
| Next | |||||
Important Notice
Our weather forecast for San Bernardino County in January 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.
Change Month
San Bernardino County in January - FAQ
What are the expected maximum and minimum temperatures in San Bernardino County during January?
Enjoy moderate daytime temperatures of up to 16° and cooler nights around 7°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in San Bernardino County during January?
In January, San Bernardino County can expect light to moderate rainfall, totaling 47.9 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 County during January?
The average wind speed in San Bernardino County during January is 11 km/h, suggesting breezy to windy conditions, depending on your activities.
January rainfall patterns in San Bernardino County
Explore the daily rainfall trends and prepare for San Bernardino Countys January weather 💧
Top locations in San Bernardino County
Select a location for an accurate weather forecast
More Locations Quick links
More San Bernardino County weather pages
You are here
Where is San Bernardino County?Get accurate weather forecasts for San Bernardino County, located at latitude 34.063 and longitude -117.651. Stay updated with localized weather information tailored for San Bernardino County.
Found a mistake?
We appreciate your attention to details. Tell us here.