Union Weather in May
Average highs run from 58°F on May 1 to 66°F on May 31, and lows from 39°F to 49°F. Normal precipitation for the month is 4.22 in over about 12 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
- 62°F
- Average low
- 44°F
- Precipitation
- 4.22 in
- Record high
- 88°FMay 25, 2007
- Record low
- 31°FMay 4, 2002
- Chance of a freeze
- 33%
- Daylight
- 14 h 13 min to 15 h 16 min
- Cloud cover
- 68%
- Humidity
- 84%
- Dew point
- 45°F
- Wind
- 6.9 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 | 58°F | 39°F | 70°F 2010 | 32°F 2018 | 37% | |
| May 2 | 58°F | 40°F | 75°F 2018 | 34°F 1995 | 37% | |
| May 3 | 59°F | 40°F | 72°F 2018 | 35°F 1990 | 37% | |
| May 4 | 59°F | 40°F | 71°F 2001 | 31°F 2002 | 37% | |
| May 5 | 59°F | 41°F | 72°F 2010 | 36°F 2013 | 37% | |
| May 6 | 60°F | 41°F | 71°F 1993 | 32°F 1992 | 38% | |
| May 7 | 60°F | 41°F | 73°F 2004 | 32°F 1992 | 38% | |
| May 8 | 60°F | 42°F | 72°F 2000 | 33°F 1992 | 38% | |
| May 9 | 61°F | 42°F | 72°F 2000 | 33°F 2017 | 38% | |
| May 10 | 61°F | 42°F | 64°F 2003 | 38°F 1995 | 38% | |
| May 11 | 61°F | 43°F | 81°F 1991 | 35°F 2010 | 38% | |
| May 12 | 61°F | 43°F | 81°F 2014 | 34°F 1992 | 38% | |
| May 13 | 62°F | 43°F | 68°F 2008 | 31°F 2018 | 38% | |
| May 14 | 62°F | 44°F | 72°F 2016 | 34°F 1996 | 38% | |
| May 15 | 62°F | 44°F | 68°F 2018 | 35°F 1996 | 38% | |
| May 16 | 63°F | 44°F | 72°F 2017 | 36°F 2003 | 39% | |
| May 17 | 63°F | 44°F | 73°F 2017 | 36°F 2003 | 39% | |
| May 18 | 63°F | 45°F | 82°F 2017 | 35°F 2002 | 39% | |
| May 19 | 63°F | 45°F | 81°F 2017 | 35°F 1991 | 39% | |
| May 20 | 64°F | 45°F | 72°F 2017 | 33°F 2002 | 39% | 0% |
| May 21 | 64°F | 46°F | 75°F 1992 | 36°F 2017 | 39% | 0% |
| May 22 | 64°F | 46°F | 75°F 1996 | 38°F 2007 | 39% | 0% |
| May 23 | 64°F | 46°F | 77°F 2016 | 38°F 1990 | 39% | 0% |
| May 24 | 65°F | 47°F | 71°F 1998 | 39°F 1990 | 39% | 0% |
| May 25 | 65°F | 47°F | 88°F 2007 | 38°F 1990 | 39% | 0% |
| May 26 | 65°F | 47°F | 83°F 2007 | 37°F 1992 | 39% | 0% |
| May 27 | 65°F | 48°F | 72°F 1991 | 38°F 1997 | 39% | 0% |
| May 28 | 66°F | 48°F | 78°F 2016 | 38°F 1994 | 39% | 0% |
| May 29 | 66°F | 48°F | 82°F 2018 | 39°F 2014 | 39% | 0% |
| May 30 | 66°F | 48°F | 78°F 1998 | 39°F 2017 | 39% | 0% |
| May 31 | 66°F | 49°F | 80°F 2018 | 39°F 1990 | 39% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (EDT).
- May 1
- sunrise 5:28 AM, sunset 7:41 PM
- May 31
- sunrise 4:57 AM, sunset 8:13 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00179593 (W Rockport 1 Nnw), public domain. Records: NOAA GHCN-Daily, station USC00176881, 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.