Portola Valley Weather in July
Average highs run from 81°F on July 1 to 81°F on July 31, and lows from 55°F to 57°F. Normal precipitation for the month is 0.00 in over about 0 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
- 81°F
- Average low
- 57°F
- Precipitation
- 0.00 in
- Record high
- 105°FJul 14, 1972
- Record low
- 41°FJul 19, 1983
- Chance of a freeze
- 0%
- Days of 90°F or more
- 3.6
- Daylight
- 14 h 42 min to 14 h 04 min
- Cloud cover
- 14%
- Humidity
- 62%
- Dew point
- 50°F
- Wind
- 8.9 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.
| Date | Normal high | Normal low | Record high | Record low | Chance wet | Chance of snow |
|---|---|---|---|---|---|---|
| Jul 1 | 81°F | 55°F | 99°F 1996 | 42°F 1976 | 1% | 0% |
| Jul 2 | 81°F | 55°F | 97°F 1985 | 44°F 1956 | 1% | 0% |
| Jul 3 | 81°F | 56°F | 101°F 1970 | 45°F 1963 | 1% | 0% |
| Jul 4 | 81°F | 56°F | 94°F 2011 | 45°F 1982 | 1% | 0% |
| Jul 5 | 81°F | 56°F | 94°F 1973 | 45°F 1955 | 1% | 0% |
| Jul 6 | 81°F | 56°F | 88°F 1968 | 42°F 2012 | 1% | 0% |
| Jul 7 | 81°F | 56°F | 96°F 1989 | 47°F 1961 | 1% | 0% |
| Jul 8 | 81°F | 56°F | 93°F 2017 | 47°F 1982 | 1% | 0% |
| Jul 9 | 81°F | 56°F | 101°F 2002 | 47°F 1964 | 1% | 0% |
| Jul 10 | 81°F | 56°F | 101°F 2002 | 47°F 1982 | 1% | 0% |
| Jul 11 | 81°F | 56°F | 101°F 1959 | 47°F 1974 | 1% | 0% |
| Jul 12 | 81°F | 57°F | 99°F 1983 | 47°F 1981 | 1% | 0% |
| Jul 13 | 81°F | 57°F | 95°F 1972 | 44°F 1977 | 1% | 0% |
| Jul 14 | 81°F | 57°F | 105°F 1972 | 46°F 1994 | 1% | 0% |
| Jul 15 | 81°F | 57°F | 105°F 1972 | 46°F 1994 | 1% | 0% |
| Jul 16 | 81°F | 57°F | 100°F 1995 | 47°F 1964 | 1% | 0% |
| Jul 17 | 81°F | 57°F | 96°F 2017 | 46°F 1955 | 1% | 0% |
| Jul 18 | 81°F | 57°F | 105°F 1988 | 47°F 1983 | 0% | 0% |
| Jul 19 | 81°F | 57°F | 96°F 1998 | 41°F 1983 | 0% | 0% |
| Jul 20 | 81°F | 57°F | 99°F 1961 | 48°F 1983 | 0% | 0% |
| Jul 21 | 81°F | 57°F | 99°F 1996 | 49°F 1963 | 0% | 0% |
| Jul 22 | 81°F | 57°F | 99°F 2006 | 46°F 2017 | 0% | 0% |
| Jul 23 | 81°F | 57°F | 99°F 2006 | 50°F 1963 | 0% | 0% |
| Jul 24 | 81°F | 57°F | 99°F 2006 | 47°F 2017 | 0% | 0% |
| Jul 25 | 81°F | 57°F | 94°F 1974 | 49°F 1955 | 0% | 0% |
| Jul 26 | 81°F | 57°F | 96°F 1973 | 47°F 1955 | 0% | 0% |
| Jul 27 | 81°F | 57°F | 96°F 1963 | 46°F 1982 | 0% | 0% |
| Jul 28 | 81°F | 57°F | 91°F 1954 | 48°F 1955 | 0% | 0% |
| Jul 29 | 81°F | 57°F | 101°F 1954 | 43°F 1978 | 0% | 0% |
| Jul 30 | 81°F | 57°F | 98°F 1977 | 48°F 1983 | 0% | 0% |
| Jul 31 | 81°F | 57°F | 101°F 1977 | 42°F 1982 | 0% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
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 8:17 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00047339 (Redwood City), public domain. Records: NOAA GHCN-Daily, station USC00046646, 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.