San Mateo County Weather in July
Average highs run from 65°F on July 1 to 65°F on July 31, and lows from 51°F to 54°F. Normal precipitation for the month is 0.14 in over about 7 wet days.
July day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
July at a glance
- Average high
- 65°F
- Average low
- 53°F
- Precipitation
- 0.14 in
- Record high
- 110°FJul 14, 1972
- Record low
- 40°FJul 3, 1979
- Chance of a freeze
- 0%
- Daylight
- 14 h 42 min to 14 h 05 min
- Cloud cover
- 58%
- Humidity
- 86%
- Dew point
- 54°F
- Wind
- 9.2 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation.
| Date | Normal high | Normal low | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| Jul 1 | 65°F | 51°F | 102°F 1972 | 43°F 1958 | 19% |
| Jul 2 | 65°F | 51°F | 104°F 1970 | 46°F 1947 | 19% |
| Jul 3 | 65°F | 51°F | 105°F 1931 | 40°F 1979 | 20% |
| Jul 4 | 65°F | 51°F | 106°F 1931 | 45°F 1933 | 20% |
| Jul 5 | 65°F | 51°F | 100°F 1940 | 44°F 1955 | 20% |
| Jul 6 | 65°F | 52°F | 100°F 1989 | 44°F 1969 | 20% |
| Jul 7 | 65°F | 52°F | 98°F 1941 | 46°F 1935 | 21% |
| Jul 8 | 65°F | 52°F | 96°F 1939 | 44°F 1948 | 21% |
| Jul 9 | 65°F | 52°F | 103°F 1961 | 45°F 1935 | 21% |
| Jul 10 | 65°F | 52°F | 104°F 1961 | 45°F 1933 | 21% |
| Jul 11 | 65°F | 52°F | 104°F 1959 | 46°F 1971 | 22% |
| Jul 12 | 65°F | 52°F | 102°F 1972 | 45°F 1932 | 22% |
| Jul 13 | 65°F | 52°F | 108°F 1972 | 46°F 1962 | 22% |
| Jul 14 | 65°F | 53°F | 110°F 1972 | 47°F 1939 | 23% |
| Jul 15 | 65°F | 53°F | 110°F 1972 | 46°F 1934 | 23% |
| Jul 16 | 65°F | 53°F | 100°F 1988 | 46°F 1931 | 23% |
| Jul 17 | 65°F | 53°F | 106°F 1988 | 45°F 1955 | 24% |
| Jul 18 | 65°F | 53°F | 105°F 1988 | 48°F 1955 | 24% |
| Jul 19 | 65°F | 53°F | 102°F 1961 | 44°F 1946 | 24% |
| Jul 20 | 65°F | 53°F | 98°F 1996 | 48°F 1934 | 24% |
| Jul 21 | 65°F | 53°F | 97°F 1996 | 48°F 1963 | 24% |
| Jul 22 | 65°F | 54°F | 108°F 2006 | 48°F 1981 | 24% |
| Jul 23 | 65°F | 54°F | 102°F 2006 | 46°F 1932 | 25% |
| Jul 24 | 65°F | 54°F | 98°F 1974 | 46°F 1968 | 25% |
| Jul 25 | 65°F | 54°F | 102°F 1973 | 47°F 1972 | 25% |
| Jul 26 | 65°F | 54°F | 100°F 1973 | 46°F 1934 | 25% |
| Jul 27 | 65°F | 54°F | 97°F 1975 | 48°F 1972 | 25% |
| Jul 28 | 65°F | 54°F | 101°F 1954 | 48°F 1932 | 25% |
| Jul 29 | 65°F | 54°F | 100°F 1954 | 45°F 1932 | 26% |
| Jul 30 | 65°F | 54°F | 101°F 1977 | 46°F 1932 | 26% |
| Jul 31 | 65°F | 54°F | 101°F 1977 | 48°F 1932 | 26% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (PDT).
- July 1
- sunrise 5:52 AM, sunset 8:34 PM
- July 31
- sunrise 6:13 AM, sunset 8:18 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00043714 (Half Moon Bay), public domain. Records: NOAA GHCN-Daily, station USC00047339, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.