Roy Weather in May
Average highs run from 61°F on May 1 to 67°F on May 31, and lows from 41°F to 47°F. Normal precipitation for the month is 2.97 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
- 64°F
- Average low
- 45°F
- Precipitation
- 2.97 in
- Record high
- 90°FMay 15, 2023
- Record low
- 36°FMay 6, 2002
- Chance of a freeze
- 7%
- Daylight
- 14 h 27 min to 15 h 37 min
- Cloud cover
- 69%
- Humidity
- 82%
- Dew point
- 46°F
- Wind
- 3.8 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 | 61°F | 41°F | 85°F 2014 | 37°F 2013 | 49% | 0% |
| May 2 | 61°F | 41°F | 85°F 2016 | 38°F 2006 | 48% | 0% |
| May 3 | 61°F | 42°F | 80°F 2026 | 41°F 1999 | 48% | 0% |
| May 4 | 62°F | 42°F | 76°F 2013 | 37°F 2020 | 47% | 0% |
| May 5 | 62°F | 42°F | 81°F 2013 | 39°F 2010 | 47% | 0% |
| May 6 | 62°F | 42°F | 83°F 2013 | 36°F 2002 | 46% | 0% |
| May 7 | 63°F | 43°F | 82°F 2016 | 37°F 2002 | 46% | 0% |
| May 8 | 63°F | 43°F | 75°F 2020 | 38°F 1999 | 45% | 0% |
| May 9 | 63°F | 43°F | 81°F 2020 | 37°F 1999 | 45% | 0% |
| May 10 | 63°F | 43°F | 82°F 2020 | 38°F 1999 | 45% | 0% |
| May 11 | 64°F | 44°F | 84°F 2024 | 41°F 2022 | 44% | 0% |
| May 12 | 64°F | 44°F | 80°F 2002 | 39°F 2008 | 44% | 0% |
| May 13 | 64°F | 44°F | 84°F 2016 | 39°F 2011 | 43% | 0% |
| May 14 | 64°F | 44°F | 87°F 2023 | 42°F 1999 | 43% | 0% |
| May 15 | 64°F | 44°F | 90°F 2023 | 40°F 2002 | 43% | 0% |
| May 16 | 65°F | 45°F | 82°F 2006 | 41°F 2003 | 43% | 0% |
| May 17 | 65°F | 45°F | 88°F 2008 | 39°F 2003 | 43% | 0% |
| May 18 | 65°F | 45°F | 77°F 2008 | 38°F 2003 | 43% | 0% |
| May 19 | 65°F | 45°F | 75°F 2008 | 42°F 1999 | 43% | 0% |
| May 20 | 65°F | 46°F | 77°F 2023 | 41°F 2022 | 42% | 0% |
| May 21 | 66°F | 46°F | 79°F 2015 | 43°F 2007 | 42% | 0% |
| May 22 | 66°F | 46°F | 81°F 2001 | 44°F 2009 | 42% | 0% |
| May 23 | 66°F | 46°F | 82°F 2001 | 43°F 2013 | 42% | 0% |
| May 24 | 66°F | 46°F | 76°F 2008 | 42°F 2010 | 42% | 0% |
| May 25 | 66°F | 47°F | 76°F 2001 | 43°F 2000 | 42% | 0% |
| May 26 | 66°F | 47°F | 87°F 2005 | 44°F 1999 | 41% | 0% |
| May 27 | 66°F | 47°F | 88°F 2005 | 43°F 2009 | 41% | 0% |
| May 28 | 67°F | 47°F | 81°F 2017 | 42°F 2011 | 41% | 0% |
| May 29 | 67°F | 47°F | 81°F 2009 | 43°F 2012 | 41% | 0% |
| May 30 | 67°F | 47°F | 85°F 2007 | 42°F 2010 | 40% | 0% |
| May 31 | 67°F | 47°F | 82°F 2001 | 44°F 2008 | 40% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (PDT).
- May 1
- sunrise 5:54 AM, sunset 8:21 PM
- May 31
- sunrise 5:20 AM, sunset 8:57 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00455224 (Mcmillin Rsvr), public domain. Records: NOAA GHCN-Daily, station USW00094274, 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.