Washington County Weather in May
Average highs run from 67°F on May 1 to 75°F on May 31, and lows from 38°F to 46°F. Normal precipitation for the month is 1.81 in over about 8 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
- 72°F
- Average low
- 42°F
- Precipitation
- 1.81 in
- Record high
- 100°FMay 28, 2003
- Record low
- 26°FMay 8, 2002
- Chance of a freeze
- 85%
- Days of 90°F or more
- 1.4
- Daylight
- 14 h 15 min to 15 h 18 min
- Cloud cover
- 59%
- Humidity
- 57%
- Dew point
- 38°F
- Wind
- 6.7 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 | 67°F | 38°F | 84°F 1998 | 27°F 2013 | 26% |
| May 2 | 68°F | 39°F | 85°F 2004 | 29°F 2008 | 26% |
| May 3 | 68°F | 39°F | 87°F 2023 | 35°F 2011 | 26% |
| May 4 | 68°F | 39°F | 87°F 2017 | 30°F 2011 | 26% |
| May 5 | 69°F | 39°F | 86°F 2020 | 31°F 1999 | 26% |
| May 6 | 69°F | 40°F | 91°F 2021 | 31°F 1999 | 26% |
| May 7 | 69°F | 40°F | 84°F 1998 | 28°F 2010 | 26% |
| May 8 | 70°F | 40°F | 86°F 2013 | 26°F 2002 | 26% |
| May 9 | 70°F | 41°F | 90°F 2013 | 31°F 1999 | 26% |
| May 10 | 70°F | 41°F | 91°F 2013 | 28°F 1999 | 26% |
| May 11 | 71°F | 41°F | 93°F 2013 | 28°F 1999 | 26% |
| May 12 | 71°F | 41°F | 94°F 2013 | 29°F 2000 | 26% |
| May 13 | 71°F | 42°F | 96°F 2013 | 28°F 2009 | 26% |
| May 14 | 71°F | 42°F | 91°F 2006 | 33°F 2017 | 26% |
| May 15 | 72°F | 42°F | 94°F 2006 | 40°F 1998 | 26% |
| May 16 | 72°F | 42°F | 94°F 2006 | 37°F 1999 | 26% |
| May 17 | 72°F | 43°F | 95°F 2006 | 34°F 2011 | 27% |
| May 18 | 73°F | 43°F | 96°F 2008 | 37°F 2003 | 27% |
| May 19 | 73°F | 43°F | 91°F 2023 | 31°F 2003 | 27% |
| May 20 | 73°F | 44°F | 94°F 2023 | 35°F 2003 | 27% |
| May 21 | 73°F | 44°F | 93°F 2023 | 35°F 2010 | 27% |
| May 22 | 73°F | 44°F | 88°F 2001 | 37°F 2010 | 27% |
| May 23 | 74°F | 44°F | 95°F 2001 | 30°F 2010 | 26% |
| May 24 | 74°F | 44°F | 98°F 2001 | 38°F 2002 | 26% |
| May 25 | 74°F | 45°F | 92°F 2026 | 37°F 2010 | 26% |
| May 26 | 74°F | 45°F | 87°F 2001 | 40°F 2011 | 26% |
| May 27 | 75°F | 45°F | 91°F 2001 | 40°F 2011 | 26% |
| May 28 | 75°F | 45°F | 100°F 2003 | 36°F 2011 | 26% |
| May 29 | 75°F | 46°F | 98°F 2020 | 39°F 2004 | 26% |
| May 30 | 75°F | 46°F | 98°F 2020 | 38°F 2006 | 25% |
| May 31 | 75°F | 46°F | 98°F 2025 | 38°F 2000 | 25% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (MDT).
- May 1
- sunrise 6:37 AM, sunset 8:52 PM
- May 31
- sunrise 6:06 AM, sunset 9:24 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00101408 (Cambridge), public domain. Records: NOAA GHCN-Daily, station USW00024162, 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.