San Mateo (CA)
January
Weather in San Mateo, California for January 2026
Your guide to San Mateo weather in January - trends and predictions
In general, the average temperature in San Mateo at the beginning of January is 12.6 °F. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 10.4 °F by the end of January.
With an average of 2 rainy days, San Mateo experiences minimal rainfall in January.
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Temperatures
Rain 🌧️
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29
Dry days
2
Rainy days
0
Snow days
12°/7°
Temperatures
12 km/h
Avg max wind
79 %
Avg humidity
San Mateo Weather January
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Temperatures trend during January in San Mateo
See the weather trend as well as the moving average line
January weather in San Mateo day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Jan. 1 |  Cloudy | 11° /7° | 0 mm | 3 | |
| Jan. 2 |  Partly cloudy | 15° /10° | 0 mm | 5 | |
| Jan. 3 |  Heavy rain at times | 12° /10° | 11.5 mm | 3 | |
| Jan. 4 |  Overcast | 12° /7° | 0 mm | 3 | |
| Jan. 5 | Overcast | 11° /7° | 0 mm | 3 | |
| Jan. 6 | Overcast | 13° /9° | 0 mm | 3 | |
| Jan. 7 |  Sunny | 14° /10° | 0 mm | 4 | |
| Jan. 8 | Cloudy | 13° /10° | 0 mm | 3 | |
| Jan. 9 | Overcast | 16° /7° | 0 mm | 4 | |
| Jan. 10 | Cloudy | 14° /7° | 0 mm | 3 | |
| Jan. 11 | Overcast | 14° /7° | 0 mm | 3 | |
| Jan. 12 | Sunny | 13° /8° | 0 mm | 4 | |
| Jan. 13 | Sunny | 12° /6° | 0 mm | 4 | |
| Jan. 14 | Sunny | 13° /6° | 0 mm | 4 | |
| Jan. 15 | Cloudy | 14° /5° | 0 mm | 3 | |
| Jan. 16 | Partly cloudy | 13° /5° | 0 mm | 4 | |
| Jan. 17 | Overcast | 10° /5° | 0 mm | 3 | |
| Jan. 18 | Overcast | 10° /6° | 0 mm | 3 | |
| Jan. 19 | Overcast | 8° /6° | 0 mm | 2 | |
| Jan. 20 | Overcast | 12° /5° | 0 mm | 3 | |
| Jan. 21 | Partly cloudy | 14° /5° | 0 mm | 4 | |
| Jan. 22 | Sunny | 14° /6° | 0 mm | 4 | |
| Jan. 23 | Sunny | 15° /6° | 0 mm | 5 | |
| Jan. 24 | Overcast | 13° /6° | 0 mm | 3 | |
| Jan. 25 |  Patchy rain possible | 10° /6° | 0.2 mm | 3 | |
| Jan. 26 | Partly cloudy | 10° /7° | 0 mm | 4 | |
| Jan. 27 | Sunny | 13° /5° | 0 mm | 4 | |
| Jan. 28 | Overcast | 10° /6° | 0 mm | 3 | |
| Jan. 29 | Overcast | 9° /6° | 0 mm | 2 | |
| Jan. 30 | Overcast | 11° /7° | 0 mm | 3 | |
| Jan. 31 |  Moderate rain | 10° /8° | 8.3 mm | 3 | |
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Important Notice
Our weather forecast for San Mateo 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 forecast closer to your planned date for the most up-to-date weather information.
Change Month
San Mateo in January - FAQ
What are the expected maximum and minimum temperatures in San Mateo during January?
During January, expect a variety of temperatures with highs around 12° and lows near 7°, suitable for diverse activities and preferences.
How much rainfall should be expected in San Mateo during January?
Expect minimal rainfall in San Mateo during January, with a total of 20 mm over approximately 2 days. This minimal precipitation is unlikely to significantly impact plans.
What are the typical wind conditions in San Mateo during January?
The average wind speed in San Mateo during January is 12 km/h, suggesting breezy to windy conditions, depending on your activities.
January rainfall patterns in San Mateo
Explore the daily rainfall trends and prepare for San Mateos January weather 💧
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