San Mateo County (San Mateo)
January
Weather in San Mateo County, California for January 2027
Your guide to San Mateo County weather in January - trends and predictions
With an average of 3 rainy days, San Mateo County experiences minimal rainfall in January.
Is January a good time to visit San Mateo County? check out the best time to travel to San Mateo County page.
✨ Is January a good time to visit San Mateo County? – Ask the AI Weatherman
Rain 🌧️
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28
Dry days
3
Rainy days
0
Snow days
13°/7°
Temperatures
12 km/h
Avg max wind
82 %
Avg humidity
San Mateo County Weather January
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Temperatures trend during January in San Mateo County
See the weather trend as well as the moving average line
January weather in San Mateo County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Jan. 1 |  Light rain | 13° /9° | 4.3 mm | 2 | |
| Jan. 2 |  Partly cloudy | 14° /10° | 0 mm | 2.3 | |
| Jan. 3 |  Heavy rain at times | 14° /12° | 19.8 mm | 2 | |
| Jan. 4 |  Heavy rain | 13° /9° | 39.1 mm | 2 | |
| Jan. 5 |  Overcast | 13° /8° | 0 mm | 2 | |
| Jan. 6 | Overcast | 12° /7° | 0 mm | 2 | |
| Jan. 7 |  Patchy rain possible | 13° /10° | 1.7 mm | 2 | |
| Jan. 8 |  Cloudy | 12° /9° | 0 mm | 2 | |
| Jan. 9 | Overcast | 15° /5° | 0 mm | 2.4 | |
| Jan. 10 | Cloudy | 13° /4° | 0 mm | 2 | |
| Jan. 11 | Overcast | 14° /5° | 0 mm | 2 | |
| Jan. 12 |  Sunny | 12° /6° | 0 mm | 2 | |
| Jan. 13 | Sunny | 14° /5° | 0 mm | 2.5 | |
| Jan. 14 | Sunny | 14° /6° | 0 mm | 2.5 | |
| Jan. 15 | Cloudy | 16° /5° | 0 mm | 2 | |
| Jan. 16 | Partly cloudy | 16° /6° | 0 mm | 2.6 | |
| Jan. 17 | Overcast | 13° /5° | 0 mm | 2 | |
| Jan. 18 | Overcast | 15° /7° | 0 mm | 2 | |
| Jan. 19 | Overcast | 13° /8° | 0 mm | 2 | |
| Jan. 20 | Overcast | 13° /5° | 0 mm | 2 | |
| Jan. 21 | Partly cloudy | 13° /6° | 0 mm | 2 | |
| Jan. 22 | Sunny | 13° /8° | 0 mm | 2 | |
| Jan. 23 | Sunny | 12° /7° | 0 mm | 2.8 | |
| Jan. 24 | Overcast | 14° /7° | 0 mm | 2 | |
| Jan. 25 | Patchy rain possible | 12° /6° | 0.1 mm | 2 | |
| Jan. 26 | Partly cloudy | 12° /5° | 0 mm | 3 | |
| Jan. 27 | Sunny | 13° /7° | 0 mm | 2 | |
| Jan. 28 | Overcast | 13° /8° | 0 mm | 2 | |
| Jan. 29 | Overcast | 11° /6° | 0 mm | 2 | |
| Jan. 30 | Overcast | 13° /6° | 0 mm | 2 | |
| Jan. 31 | Light rain | 14° /7° | 4.1 mm | 2 | |
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Important Notice
Our weather forecast for San Mateo 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 Mateo County forecast closer to your planned date for the most up-to-date weather information.
Change Month
San Mateo County in January - FAQ
What are the expected maximum and minimum temperatures in San Mateo County during January?
During January, expect a variety of temperatures with highs around 13° and lows near 7°, suitable for diverse activities and preferences.
How much rainfall should be expected in San Mateo County during January?
Moderate rainfall is anticipated in San Mateo County during January, with a total of 69.2 mm spread over approximately 3 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in San Mateo County during January?
The average wind speed in San Mateo County during January is 12 km/h, suggesting breezy to windy conditions, depending on your activities.
January rainfall patterns in San Mateo County
Explore the daily rainfall trends and prepare for San Mateo Countys January weather 💧
Typically, San Mateo County has 3 rainy days in January with a total of 69.2 mm of rainfall.
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