San Bruno Weather in May
Average highs run from 66°F on May 1 to 68°F on May 31, and lows from 49°F to 50°F. Normal precipitation for the month is 1.00 in over about 4 wet days.
May day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
May at a glance
- Average high
- 67°F
- Average low
- 49°F
- Precipitation
- 1.00 in
- Record high
- 97°FMay 27, 1984
- Record low
- 39°FMay 3, 1950
- Chance of a freeze
- 0%
- Daylight
- 13 h 46 min to 14 h 35 min
- Cloud cover
- 54%
- Humidity
- 85%
- Dew point
- 50°F
- Wind
- 11.0 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 |
|---|---|---|---|---|---|
| May 1 | 66°F | 49°F | 89°F 1947 | 44°F 1946 | 17% |
| May 2 | 66°F | 49°F | 89°F 2013 | 42°F 1950 | 17% |
| May 3 | 66°F | 49°F | 87°F 2017 | 39°F 1950 | 17% |
| May 4 | 66°F | 49°F | 84°F 2011 | 40°F 1950 | 16% |
| May 5 | 66°F | 49°F | 91°F 1987 | 41°F 1965 | 16% |
| May 6 | 66°F | 49°F | 87°F 1949 | 41°F 1968 | 16% |
| May 7 | 66°F | 49°F | 89°F 2007 | 40°F 1968 | 16% |
| May 8 | 66°F | 49°F | 86°F 2001 | 44°F 1952 | 15% |
| May 9 | 67°F | 49°F | 88°F 1993 | 41°F 1950 | 15% |
| May 10 | 67°F | 49°F | 84°F 2006 | 43°F 1953 | 15% |
| May 11 | 67°F | 49°F | 85°F 1959 | 42°F 1953 | 15% |
| May 12 | 67°F | 49°F | 96°F 1976 | 42°F 1953 | 14% |
| May 13 | 67°F | 49°F | 92°F 2014 | 45°F 1956 | 14% |
| May 14 | 67°F | 49°F | 91°F 2014 | 41°F 1968 | 14% |
| May 15 | 67°F | 49°F | 96°F 2008 | 43°F 1955 | 14% |
| May 16 | 67°F | 49°F | 93°F 1956 | 44°F 1955 | 13% |
| May 17 | 67°F | 50°F | 93°F 1997 | 45°F 1966 | 13% |
| May 18 | 67°F | 50°F | 85°F 1978 | 42°F 1950 | 13% |
| May 19 | 67°F | 50°F | 86°F 1952 | 42°F 1950 | 12% |
| May 20 | 67°F | 50°F | 93°F 1988 | 45°F 1950 | 12% |
| May 21 | 67°F | 50°F | 92°F 2000 | 45°F 1962 | 12% |
| May 22 | 67°F | 50°F | 83°F 1954 | 44°F 1952 | 12% |
| May 23 | 67°F | 50°F | 88°F 1982 | 46°F 1954 | 11% |
| May 24 | 67°F | 50°F | 91°F 1982 | 45°F 1953 | 11% |
| May 25 | 68°F | 50°F | 90°F 2020 | 45°F 1953 | 11% |
| May 26 | 68°F | 50°F | 89°F 1974 | 42°F 1953 | 11% |
| May 27 | 68°F | 50°F | 97°F 1984 | 42°F 1954 | 10% |
| May 28 | 68°F | 50°F | 92°F 1984 | 45°F 1954 | 10% |
| May 29 | 68°F | 50°F | 94°F 1975 | 45°F 1946 | 10% |
| May 30 | 68°F | 50°F | 95°F 2001 | 46°F 1974 | 9% |
| May 31 | 68°F | 50°F | 91°F 2001 | 46°F 1962 | 9% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (PDT).
- May 1
- sunrise 6:14 AM, sunset 8:00 PM
- May 31
- sunrise 5:50 AM, sunset 8:25 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00046599 (Pacifica 4 Sse), public domain. Records: NOAA GHCN-Daily, station USW00023234, 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.