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Weather in San Mateo County, California for July 2026

Your guide to San Mateo County weather in July - trends and predictions

    Official Weather Alert ⚠️

  • Small Craft Advisory - See hour by hour.

    • Temperatures

  • So far, July 2026 in San Mateo County is slightly warmer than the historical average by 0.9 °F.

  • Expect cooler weather in the next days in San Mateo County with the forecast suggesting a temperature of 22.8 °F, lower than the historical average.

  • 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 slightly increase, reaching an average of 20.9 °F by the end of July.

    • Rain 🌧️

  • Precipitation in San Mateo County during July is a rare event, with an average of fewer than 2 rainy days.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
31
Dry days
Average rainy days
0
Rainy days
Average snowy days
0
Snow days
Average temperatures
20°/13°
Temperatures
Average wind speed
18 km/h
Avg max wind
Average humidity
77 %
Avg humidity

San Mateo County Weather July

Move between months or click on a day
June
August
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Overcast
20°
2
Overcast
22°
3
Sunny
22°
4
Cloudy
21°
5
Cloudy
20°
6
Sunny
19°
7
Overcast
20°
8
Overcast
20°
9
Partly cloudy
20°
10
Cloudy
21°
11
Overcast
22°
12
Sunny
24°
13
Cloudy
23°
14
Cloudy
23°
15
Sunny
22°
16
Sunny
20°
17
Sunny
19°
18
Partly cloudy
20°
19
Overcast
21°
20
Overcast
20°
21
Overcast
21°
22
Overcast
19°
23
Overcast
21°
24
Cloudy
22°
25
Sunny
20°
26
Overcast
18°
27
Patchy rain possible
18°
28
Cloudy
19°
29
Weather Alert Sunny
26°
30
Sunny
22°
31
Sunny
23°

Temperatures trend during July in San Mateo County

See the weather trend as well as the moving average line

July weather in San Mateo County day by day

Click on a date for more information
June August
Date Weather Temperatures Rain UV More
Jul. 1 Overcast
Overcast
 20° /11° 0 mm 7
Jul. 2 Overcast
Overcast
 22° /12° 0 mm 8
Jul. 3 Sunny
Sunny
 22° /12° 0 mm 8
Jul. 4 Cloudy
Cloudy
 21° /12° 0 mm 7
Jul. 5 Cloudy
Cloudy
 20° /11° 0 mm 7
Jul. 6 Sunny
Sunny
 19° /12° 0 mm 7
Jul. 7 Overcast
Overcast
 20° /12° 0 mm 5
Jul. 8 Overcast
Overcast
 20° /12° 0 mm 7
Jul. 9 Partly cloudy
Partly cloudy
 20° /12° 0 mm 7
Jul. 10 Cloudy
Cloudy
 21° /11° 0 mm 7
Jul. 11 Overcast
Overcast
 22° /11° 0 mm 7
Jul. 12 Sunny
Sunny
 24° /13° 0.1 mm 8
Jul. 13 Cloudy
Cloudy
 23° /13° 0.3 mm 7
Jul. 14 Cloudy
Cloudy
 23° /13° 0 mm 7
Jul. 15 Sunny
Sunny
 22° /13° 0 mm 7
Jul. 16 Sunny
Sunny
 20° /12° 0 mm 7
Jul. 17 Sunny
Sunny
 19° /12° 0 mm 7
Jul. 18 Partly cloudy
Partly cloudy
 20° /13° 0 mm 7
Jul. 19 Overcast
Overcast
 21° /12° 0.1 mm 7
Jul. 20 Overcast
Overcast
 20° /12° 0.5 mm 7
Jul. 21 Overcast
Overcast
 21° /13° 1.2 mm 7
Jul. 22 Overcast
Overcast
 19° /14° 0 mm 7
Jul. 23 Overcast
Overcast
 21° /14° 0 mm 7
Jul. 24 Cloudy
Cloudy
 22° /14° 0 mm 7
Jul. 25 Sunny
Sunny
 20° /13° 0 mm 7
Jul. 26 Overcast
Overcast
 18° /12° 0 mm 7
Jul. 27 Patchy rain possible
Patchy rain possible
 18° /12° 0.2 mm 6
Jul. 28 Cloudy
Cloudy
 19° /13° 0 mm 7
Jul. 29 Sunny
Sunny
 26° /13° 0 mm 9.6
Jul. 30 Sunny
Sunny
 22° /12° 0 mm 10.3
Jul. 31 Sunny
Sunny
 23° /12° 0 mm 10.3
Next
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 20° 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.

July rainfall patterns in San Mateo County

Explore the daily rainfall trends and prepare for San Mateo Countys July weather 💧

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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Location coordinates 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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