San Mateo County (San Mateo)
April
Weather in San Mateo County, California for April 2026
Your guide to San Mateo County weather in April - trends and predictions
Until now, April 2026 in San Mateo County has been nearly identical to the historical average, with a temperature of 15.9 °F (showing only a slight deviation of 0.2 °F).
In general, the average temperature in San Mateo County at the beginning of April is 15.9 °F. As the month progressed, temperatures tended to slightly decrease, reaching an average of 15.7 °F by the end of April.
With an average of 2 rainy days, San Mateo County experiences minimal rainfall in April.
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Temperatures
Rain 🌧️
More
28
Dry days
2
Rainy days
0
Snow days
15°/9°
Temperatures
17 km/h
Avg max wind
83 %
Avg humidity
San Mateo County Weather April
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Temperatures trend during April in San Mateo County
See the weather trend as well as the moving average line
April weather in San Mateo County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Apr. 1 |  Moderate or heavy rain shower | 13° /10° | 5.7 mm | 2 | |
| Apr. 2 |  Cloudy | 13° /8° | 2.8 mm | 5 | |
| Apr. 3 |  Partly cloudy | 17° /8° | 0 mm | 6 | |
| Apr. 4 |  Overcast | 21° /9° | 0 mm | 6 | |
| Apr. 5 | Overcast | 19° /10° | 0 mm | 6 | |
| Apr. 6 | Overcast | 14° /8° | 0 mm | 3 | |
| Apr. 7 |  Patchy rain possible | 14° /9° | 0.2 mm | 3 | |
| Apr. 8 | Overcast | 17° /10° | 0 mm | 4 | |
| Apr. 9 | Overcast | 18° /11° | 0 mm | 3 | |
| Apr. 10 | Overcast | 16° /10° | 0 mm | 3 | |
| Apr. 11 | Overcast | 14° /10° | 17.2 mm | 2 | |
| Apr. 12 | Overcast | 14° /9° | 19.1 mm | 3 | |
| Apr. 13 | Overcast | 17° /9° | 0 mm | 6 | |
| Apr. 14 | Cloudy | 16° /9° | 0 mm | 5 | |
| Apr. 15 | Overcast | 16° /9° | 0 mm | 4 | |
| Apr. 16 | Overcast | 17° /9° | 0 mm | 6 | |
| Apr. 17 | Patchy rain possible | 17° /9° | 0.2 mm | 6 | |
| Apr. 18 | Overcast | 17° /9° | 0 mm | 3 | |
| Apr. 19 | Overcast | 17° /9° | 0 mm | 4 | |
| Apr. 20 | Overcast | 17° /9° | 6.2 mm | 5 | |
| Apr. 21 | Overcast | 17° /9° | 6 mm | 4 | |
| Apr. 22 | Overcast | 15° /9° | 1 mm | 5 | |
| Apr. 23 | Overcast | 14° /9° | 0 mm | 6 | |
| Apr. 24 | Patchy rain possible | 14° /9° | 0.1 mm | 6 | |
| Apr. 25 | Patchy rain possible | 13° /9° | 0.2 mm | 3 | |
| Apr. 26 | Patchy rain possible | 14° /10° | 1.3 mm | 4 | |
| Apr. 27 | Patchy rain possible | 13° /9° | 0.5 mm | 5 | |
| Apr. 28 | Overcast | 16° /9° | 0 mm | 7 | |
| Apr. 29 | Overcast | 17° /9° | 0 mm | 7 | |
| Apr. 30 |  Sunny | 23° /10° | 0 mm | 8.5 | |
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Important Notice
Our weather forecast for San Mateo County in April 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 April - FAQ
What are the expected maximum and minimum temperatures in San Mateo County during April?
During April, expect a variety of temperatures with highs around 15° and lows near 9°, suitable for diverse activities and preferences.
How much rainfall should be expected in San Mateo County during April?
Expect minimal rainfall in San Mateo County during April, with a total of 13.4 mm over approximately 2 days. This minimal precipitation is unlikely to significantly impact plans.
What are the typical wind conditions in San Mateo County during April?
The average wind speed in San Mateo County during April is 17 km/h, suggesting breezy to windy conditions, depending on your activities.
April rainfall patterns in San Mateo County
Explore the daily rainfall trends and prepare for San Mateo Countys April weather 💧
Typically, San Mateo County has 2 rainy days in April with a total of 13.4 mm of rainfall.
UV exposure in San Mateo County during April
Stay informed about UV levels for safe outdoor activities throughout the month of April ☀️
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Where is San Mateo County?Get accurate weather forecasts for San Mateo County, located at latitude 37.563 and longitude -122.326. Stay updated with localized weather information tailored for San Mateo County.
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