Hayward Weather in May
Average highs run from 63°F on May 1 to 74°F on May 31, and lows from 36°F to 47°F. Normal precipitation for the month is 3.99 in over about 13 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
- 69°F
- Average low
- 42°F
- Precipitation
- 3.99 in
- Snowfall
- 0.6 in
- Record high
- 98°FMay 28, 2006
- Record low
- 17°FMay 3, 2005
- Chance of a freeze
- 89%
- Days of 90°F or more
- 0.5
- Daylight
- 14 h 21 min to 15 h 30 min
- Cloud cover
- 70%
- Humidity
- 75%
- Dew point
- 44°F
- Wind
- 7.6 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 | 63°F | 36°F | 85°F 2021 | 21°F 1997 | 39% | 4% |
| May 2 | 64°F | 37°F | 78°F 2012 | 22°F 2003 | 39% | 4% |
| May 3 | 64°F | 37°F | 80°F 2000 | 17°F 2005 | 39% | 3% |
| May 4 | 65°F | 37°F | 84°F 2000 | 23°F 2005 | 39% | 3% |
| May 5 | 65°F | 38°F | 85°F 2000 | 23°F 2002 | 39% | 3% |
| May 6 | 66°F | 38°F | 90°F 2016 | 28°F 1997 | 39% | 3% |
| May 7 | 66°F | 39°F | 85°F 2018 | 25°F 2019 | 39% | 2% |
| May 8 | 67°F | 39°F | 80°F 2007 | 23°F 2021 | 39% | 2% |
| May 9 | 67°F | 39°F | 86°F 2007 | 20°F 2010 | 40% | 2% |
| May 10 | 67°F | 40°F | 90°F 2007 | 24°F 2021 | 40% | 2% |
| May 11 | 68°F | 40°F | 84°F 2025 | 22°F 2021 | 40% | 2% |
| May 12 | 68°F | 41°F | 85°F 2025 | 20°F 2020 | 40% | 1% |
| May 13 | 69°F | 41°F | 85°F 2025 | 22°F 2013 | 40% | 1% |
| May 14 | 69°F | 41°F | 92°F 2007 | 24°F 2016 | 40% | 1% |
| May 15 | 69°F | 42°F | 88°F 2001 | 24°F 2004 | 40% | 1% |
| May 16 | 70°F | 42°F | 87°F 2018 | 26°F 2011 | 40% | 1% |
| May 17 | 70°F | 42°F | 84°F 1998 | 26°F 2002 | 40% | 1% |
| May 18 | 70°F | 43°F | 87°F 2012 | 26°F 2000 | 40% | 1% |
| May 19 | 71°F | 43°F | 87°F 2012 | 22°F 2000 | 40% | 1% |
| May 20 | 71°F | 44°F | 89°F 2009 | 22°F 2002 | 41% | 0% |
| May 21 | 71°F | 44°F | 82°F 2016 | 27°F 1997 | 41% | 0% |
| May 22 | 72°F | 44°F | 86°F 2007 | 28°F 2009 | 41% | 0% |
| May 23 | 72°F | 45°F | 85°F 2006 | 28°F 2025 | 41% | 0% |
| May 24 | 72°F | 45°F | 91°F 2010 | 27°F 2013 | 42% | 0% |
| May 25 | 73°F | 45°F | 90°F 2010 | 29°F 2003 | 42% | 0% |
| May 26 | 73°F | 46°F | 91°F 2018 | 29°F 1999 | 42% | 0% |
| May 27 | 73°F | 46°F | 91°F 2006 | 29°F 1997 | 42% | 0% |
| May 28 | 73°F | 46°F | 98°F 2006 | 30°F 2004 | 42% | 0% |
| May 29 | 74°F | 47°F | 98°F 2006 | 30°F 2021 | 43% | 0% |
| May 30 | 74°F | 47°F | 87°F 2006 | 28°F 2001 | 43% | 0% |
| May 31 | 74°F | 47°F | 90°F 2023 | 28°F 2009 | 43% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (CDT).
- May 1
- sunrise 5:53 AM, sunset 8:14 PM
- May 31
- sunrise 5:19 AM, sunset 8:49 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00473511 (Hayward RS), public domain. Records: NOAA GHCN-Daily, station USW00094973, 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.