San Tan Valley Weather in May
Average highs run from 89°F on May 1 to 99°F on May 31, and lows from 56°F to 65°F. Normal precipitation for the month is 0.36 in over about 1 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
- 94°F
- Average low
- 61°F
- Precipitation
- 0.36 in
- Record high
- 112°FMay 28, 2003
- Record low
- 46°FMay 1, 2010
- Chance of a freeze
- 0%
- Days of 90°F or more
- 23.1
- Daylight
- 13 h 31 min to 14 h 12 min
- Cloud cover
- 25%
- Humidity
- 24%
- Dew point
- 32°F
- Wind
- 7.8 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 | 89°F | 56°F | 102°F 2020 | 46°F 2010 | 2% |
| May 2 | 89°F | 57°F | 100°F 2020 | 49°F 2008 | 3% |
| May 3 | 90°F | 57°F | 100°F 2004 | 46°F 2010 | 3% |
| May 4 | 90°F | 57°F | 104°F 2016 | 48°F 2010 | 3% |
| May 5 | 90°F | 58°F | 107°F 2017 | 52°F 2010 | 3% |
| May 6 | 91°F | 58°F | 106°F 2018 | 51°F 2024 | 3% |
| May 7 | 91°F | 58°F | 103°F 2018 | 52°F 2014 | 3% |
| May 8 | 91°F | 58°F | 104°F 2009 | 51°F 2005 | 3% |
| May 9 | 92°F | 59°F | 104°F 2009 | 46°F 2015 | 3% |
| May 10 | 92°F | 59°F | 105°F 2018 | 47°F 2003 | 3% |
| May 11 | 92°F | 59°F | 111°F 2026 | 48°F 2023 | 3% |
| May 12 | 93°F | 60°F | 108°F 2026 | 47°F 2010 | 3% |
| May 13 | 93°F | 60°F | 104°F 2026 | 50°F 2022 | 3% |
| May 14 | 93°F | 60°F | 107°F 2012 | 51°F 2008 | 3% |
| May 15 | 94°F | 61°F | 109°F 2012 | 54°F 2025 | 4% |
| May 16 | 94°F | 61°F | 105°F 2006 | 52°F 2015 | 4% |
| May 17 | 94°F | 61°F | 108°F 2006 | 56°F 2017 | 4% |
| May 18 | 95°F | 62°F | 110°F 2009 | 52°F 2019 | 4% |
| May 19 | 95°F | 62°F | 108°F 2008 | 48°F 2011 | 4% |
| May 20 | 96°F | 62°F | 107°F 2008 | 54°F 2011 | 4% |
| May 21 | 96°F | 62°F | 109°F 2005 | 52°F 2019 | 4% |
| May 22 | 96°F | 63°F | 111°F 2005 | 50°F 2008 | 4% |
| May 23 | 97°F | 63°F | 108°F 2005 | 49°F 2021 | 4% |
| May 24 | 97°F | 63°F | 106°F 2017 | 46°F 2010 | 4% |
| May 25 | 97°F | 64°F | 104°F 2005 | 50°F 2010 | 4% |
| May 26 | 98°F | 64°F | 106°F 2005 | 52°F 2008 | 3% |
| May 27 | 98°F | 64°F | 107°F 2003 | 52°F 2012 | 3% |
| May 28 | 98°F | 65°F | 112°F 2003 | 52°F 2012 | 3% |
| May 29 | 99°F | 65°F | 112°F 2020 | 55°F 2006 | 3% |
| May 30 | 99°F | 65°F | 110°F 2020 | 54°F 2011 | 3% |
| May 31 | 99°F | 65°F | 109°F 2012 | 54°F 2011 | 3% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (MST).
- May 1
- sunrise 5:38 AM, sunset 7:09 PM
- May 31
- sunrise 5:18 AM, sunset 7:30 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00023027 (Florence), public domain. Records: NOAA GHCN-Daily, station USC00022782, 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.