Santa Rosa Weather in May
Average highs run from 25°C on May 1 to 24°C on May 31, and lows from 15°C to 15°C. Normal precipitation for the month is 12 mm over about 3 wet days.
May day by day
The normal high and low for each date, in °C.
- Normal low
- Normal high
- Reanalysis extreme high
- Reanalysis extreme low
May at a glance
- Average high
- 24°C
- Average low
- 15°C
- Precipitation
- 12 mm
- Reanalysis high
- 28°CMay 26, 2020
- Reanalysis low
- 11°CMay 27, 2020
- Daylight
- 11 h 43 min to 11 h 32 min
- Cloud cover
- 69%
- Humidity
- 75%
- Dew point
- 14°C
- Wind
- 5.8 km/h
Every day of the month
A wet day has at least 1 mm of precipitation in the reanalysis.
| Date | Normal high | Normal low | Reanalysis high | Reanalysis low | Chance wet |
|---|---|---|---|---|---|
| May 1 | 25°C | 15°C | 27°C 2007 | 13°C 1993 | 15% |
| May 2 | 24°C | 15°C | 27°C 2007 | 13°C 2006 | 15% |
| May 3 | 24°C | 15°C | 27°C 1998 | 12°C 2011 | 15% |
| May 4 | 25°C | 15°C | 26°C 2020 | 12°C 2008 | 14% |
| May 5 | 25°C | 15°C | 28°C 2020 | 12°C 2008 | 14% |
| May 6 | 25°C | 15°C | 28°C 2010 | 12°C 1997 | 14% |
| May 7 | 25°C | 15°C | 28°C 2019 | 13°C 1997 | 14% |
| May 8 | 25°C | 15°C | 27°C 2011 | 13°C 1997 | 13% |
| May 9 | 25°C | 15°C | 27°C 1992 | 14°C 2006 | 13% |
| May 10 | 24°C | 15°C | 27°C 1992 | 13°C 2006 | 13% |
| May 11 | 24°C | 15°C | 27°C 2005 | 12°C 2006 | 12% |
| May 12 | 24°C | 15°C | 28°C 2020 | 12°C 2010 | 12% |
| May 13 | 24°C | 15°C | 27°C 2007 | 13°C 2010 | 12% |
| May 14 | 24°C | 15°C | 27°C 2007 | 12°C 2006 | 12% |
| May 15 | 24°C | 15°C | 28°C 2007 | 12°C 2006 | 12% |
| May 16 | 24°C | 15°C | 27°C 2010 | 13°C 2006 | 12% |
| May 17 | 24°C | 15°C | 27°C 1992 | 13°C 1998 | 13% |
| May 18 | 24°C | 15°C | 27°C 2020 | 13°C 1998 | 13% |
| May 19 | 24°C | 15°C | 27°C 1992 | 12°C 1998 | 13% |
| May 20 | 24°C | 15°C | 28°C 2008 | 12°C 1998 | 12% |
| May 21 | 24°C | 15°C | 27°C 2008 | 13°C 1998 | 11% |
| May 22 | 24°C | 15°C | 26°C 2003 | 13°C 1999 | 10% |
| May 23 | 24°C | 15°C | 26°C 1992 | 13°C 2006 | 11% |
| May 24 | 24°C | 15°C | 27°C 1992 | 13°C 2006 | 10% |
| May 25 | 24°C | 15°C | 27°C 2005 | 12°C 2007 | 10% |
| May 26 | 24°C | 15°C | 28°C 2020 | 12°C 2007 | 10% |
| May 27 | 24°C | 15°C | 28°C 2020 | 11°C 2020 | 10% |
| May 28 | 24°C | 15°C | 27°C 2012 | 12°C 1995 | 9% |
| May 29 | 24°C | 15°C | 28°C 1991 | 13°C 2012 | 8% |
| May 30 | 24°C | 15°C | 28°C 2019 | 13°C 2011 | 8% |
| May 31 | 24°C | 15°C | 27°C 2019 | 12°C 2011 | 8% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT-5).
- May 1
- sunrise 6:05 AM, sunset 5:48 PM
- May 31
- sunrise 6:11 AM, sunset 5:43 PM
Other months
Sources
Cloud, humidity, wind and sunshine, and temperature and precipitation: 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.