San Mateo County (San Mateo)
July
Weather in San Mateo County, California for July 2026
Your guide to San Mateo County weather in July - trends and predictions
In general, the average temperature in San Mateo County at the beginning of July is 20.6 °F. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 17.7 °F by the end of July.
Precipitation in San Mateo County during July is a rare event, with an average of fewer than 2 rainy days.
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Temperatures
Rain 🌧️
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31
Dry days
0
Rainy days
0
Snow days
19°/13°
Temperatures
18 km/h
Avg max wind
78 %
Avg humidity
San Mateo County Weather July
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Temperatures trend during July in San Mateo County
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July weather in San Mateo County day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Jul. 1 |  Overcast | 20° /12° | 0 mm | 5 | |
| Jul. 2 | Overcast | 23° /12° | 0 mm | 6 | |
| Jul. 3 |  Sunny | 22° /12° | 0 mm | 6 | |
| Jul. 4 |  Cloudy | 20° /12° | 0 mm | 5 | |
| Jul. 5 | Cloudy | 19° /12° | 0 mm | 5 | |
| Jul. 6 | Sunny | 19° /12° | 0 mm | 5 | |
| Jul. 7 | Sunny | 21° /12° | 0 mm | 5 | |
| Jul. 8 | Sunny | 20° /13° | 0 mm | 5 | |
| Jul. 9 |  Partly cloudy | 19° /13° | 0 mm | 5 | |
| Jul. 10 | Cloudy | 22° /12° | 0 mm | 5 | |
| Jul. 11 | Overcast | 21° /12° | 0 mm | 5 | |
| Jul. 12 | Sunny | 23° /13° | 0 mm | 6 | |
| Jul. 13 | Cloudy | 21° /13° | 0 mm | 5 | |
| Jul. 14 | Cloudy | 19° /13° | 0 mm | 5 | |
| Jul. 15 | Sunny | 20° /12° | 0 mm | 5 | |
| Jul. 16 | Sunny | 19° /12° | 0 mm | 5 | |
| Jul. 17 | Sunny | 19° /12° | 0 mm | 5 | |
| Jul. 18 | Partly cloudy | 20° /13° | 0 mm | 5 | |
| Jul. 19 | Sunny | 20° /12° | 0 mm | 5 | |
| Jul. 20 | Overcast | 18° /12° | 0 mm | 4 | |
| Jul. 21 | Overcast | 18° /13° | 0 mm | 4 | |
| Jul. 22 | Overcast | 18° /13° | 0 mm | 5 | |
| Jul. 23 | Cloudy | 22° /14° | 0 mm | 5 | |
| Jul. 24 | Cloudy | 22° /15° | 0 mm | 5 | |
| Jul. 25 | Sunny | 19° /13° | 0 mm | 5 | |
| Jul. 26 | Overcast | 17° /12° | 0 mm | 4 | |
| Jul. 27 |  Patchy rain possible | 16° /13° | 0.3 mm | 4 | |
| Jul. 28 | Cloudy | 17° /13° | 0 mm | 4 | |
| Jul. 29 | Cloudy | 17° /12° | 0 mm | 4 | |
| Jul. 30 | Patchy rain possible | 18° /14° | 0 mm | 4 | |
| Jul. 31 | Patchy rain possible | 20° /13° | 0.1 mm | 5 | |
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Important Notice
Our weather forecast for San Mateo County in July 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.
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San Mateo County in July - FAQ
What are the expected maximum and minimum temperatures in San Mateo County during July?
Enjoy moderate daytime temperatures of up to 19° and cooler nights around 13°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in San Mateo County during July?
Rainfall in San Mateo County during July is rare to nonexistent, with the total expected rainfall being less than 10 mm and approximately 0 days seeing any precipitation. Planning without the concern for rain is generally straightforward during this very dry period.
What are the typical wind conditions in San Mateo County during July?
The average wind speed in San Mateo County during July is 18 km/h, suggesting breezy to windy conditions, depending on your activities.
UV exposure in San Mateo County during July
Stay informed about UV levels for safe outdoor activities throughout the month of July ☀️
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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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