Santa Rosa Weather in May
Average highs run from 78°F on May 1 to 89°F on May 31, and lows from 44°F to 54°F. Normal precipitation for the month is 1.28 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
- 83°F
- Average low
- 48°F
- Precipitation
- 1.28 in
- Record high
- 100°FMay 23, 2005
- Record low
- 21°FMay 19, 2000
- Chance of a freeze
- 21%
- Days of 90°F or more
- 6.8
- Daylight
- 13 h 36 min to 14 h 21 min
- Cloud cover
- 45%
- Humidity
- 36%
- Dew point
- 34°F
- Wind
- 11.6 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 |
|---|---|---|---|---|---|---|
| May 1 | 78°F | 44°F | 93°F 2020 | 31°F 1962 | 9% | |
| May 2 | 78°F | 44°F | 92°F 1943 | 28°F 1953 | 9% | |
| May 3 | 79°F | 44°F | 95°F 1947 | 29°F 1954 | 10% | |
| May 4 | 79°F | 45°F | 97°F 1947 | 30°F 1953 | 10% | |
| May 5 | 79°F | 45°F | 93°F 2000 | 32°F 1933 | 10% | |
| May 6 | 80°F | 45°F | 92°F 1934 | 31°F 1960 | 10% | |
| May 7 | 80°F | 45°F | 95°F 1989 | 32°F 1933 | 10% | |
| May 8 | 80°F | 46°F | 98°F 1989 | 33°F 1984 | 10% | |
| May 9 | 81°F | 46°F | 95°F 1989 | 31°F 1964 | 10% | |
| May 10 | 81°F | 46°F | 93°F 1962 | 34°F 1981 | 11% | |
| May 11 | 81°F | 47°F | 97°F 1962 | 31°F 1953 | 11% | |
| May 12 | 82°F | 47°F | 96°F 1996 | 30°F 1918 | 11% | |
| May 13 | 82°F | 47°F | 94°F 1996 | 30°F 1918 | 11% | |
| May 14 | 82°F | 48°F | 95°F 1978 | 32°F 1933 | 12% | |
| May 15 | 83°F | 48°F | 95°F 2000 | 27°F 2000 | 12% | |
| May 16 | 83°F | 48°F | 98°F 1948 | 33°F 1998 | 12% | |
| May 17 | 83°F | 49°F | 96°F 1927 | 22°F 2000 | 12% | |
| May 18 | 84°F | 49°F | 95°F 1966 | 35°F 1983 | 13% | |
| May 19 | 84°F | 49°F | 96°F 1996 | 21°F 2000 | 13% | |
| May 20 | 85°F | 50°F | 99°F 1925 | 35°F 1960 | 13% | |
| May 21 | 85°F | 50°F | 99°F 2005 | 37°F 1967 | 13% | 0% |
| May 22 | 85°F | 50°F | 97°F 1989 | 33°F 1931 | 14% | 0% |
| May 23 | 86°F | 51°F | 100°F 2005 | 35°F 1930 | 14% | 0% |
| May 24 | 86°F | 51°F | 100°F 2000 | 36°F 1930 | 14% | 0% |
| May 25 | 86°F | 51°F | 98°F 2006 | 38°F 2010 | 14% | 0% |
| May 26 | 87°F | 52°F | 97°F 2006 | 41°F 1996 | 15% | 0% |
| May 27 | 87°F | 52°F | 98°F 1974 | 40°F 1997 | 15% | 0% |
| May 28 | 88°F | 53°F | 97°F 1951 | 39°F 2012 | 15% | 0% |
| May 29 | 88°F | 53°F | 97°F 2000 | 37°F 1947 | 15% | 0% |
| May 30 | 88°F | 53°F | 97°F 2000 | 41°F 1975 | 15% | 0% |
| May 31 | 89°F | 54°F | 97°F 2002 | 42°F 1983 | 15% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (MDT).
- May 1
- sunrise 6:08 AM, sunset 7:44 PM
- May 31
- sunrise 5:46 AM, sunset 8:07 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00298107 (Santa Rosa), public domain. Records: NOAA GHCN-Daily, station USC00298107, 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 2026-09-25. Sun and moon: computed with the NOAA solar equations and Meeus.