Union Weather in May
Average highs run from 81°F on May 1 to 88°F on May 31, and lows from 54°F to 63°F. Normal precipitation for the month is 4.08 in over about 9 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
- 84°F
- Average low
- 59°F
- Precipitation
- 4.08 in
- Record high
- 101°FMay 31, 1951
- Record low
- 37°FMay 2, 1909
- Chance of a freeze
- 0%
- Days of 90°F or more
- 4.6
- Daylight
- 13 h 28 min to 14 h 09 min
- Cloud cover
- 53%
- Humidity
- 77%
- Dew point
- 63°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 | 81°F | 54°F | 94°F 1901 | 38°F 1903 | 26% | 0% |
| May 2 | 81°F | 55°F | 93°F 2012 | 37°F 1909 | 26% | 0% |
| May 3 | 81°F | 55°F | 92°F 1891 | 40°F 1929 | 26% | 0% |
| May 4 | 81°F | 55°F | 93°F 1891 | 39°F 1921 | 27% | 0% |
| May 5 | 82°F | 56°F | 93°F 1952 | 40°F 1976 | 27% | 0% |
| May 6 | 82°F | 56°F | 94°F 1952 | 38°F 1891 | 27% | 0% |
| May 7 | 82°F | 56°F | 94°F 1952 | 37°F 1944 | 27% | 0% |
| May 8 | 82°F | 57°F | 92°F 1952 | 41°F 1891 | 27% | 0% |
| May 9 | 83°F | 57°F | 92°F 2018 | 38°F 1917 | 27% | 0% |
| May 10 | 83°F | 57°F | 93°F 1986 | 37°F 1906 | 27% | 0% |
| May 11 | 83°F | 58°F | 92°F 1916 | 43°F 1928 | 27% | 0% |
| May 12 | 83°F | 58°F | 92°F 1916 | 41°F 1960 | 27% | 0% |
| May 13 | 84°F | 58°F | 93°F 1916 | 39°F 1960 | 28% | 0% |
| May 14 | 84°F | 59°F | 94°F 2018 | 41°F 1910 | 28% | 0% |
| May 15 | 84°F | 59°F | 94°F 2018 | 40°F 1917 | 28% | 0% |
| May 16 | 84°F | 59°F | 95°F 2018 | 42°F 1891 | 28% | 0% |
| May 17 | 85°F | 59°F | 93°F 1911 | 44°F 2011 | 28% | 0% |
| May 18 | 85°F | 60°F | 95°F 1951 | 40°F 2011 | 28% | 0% |
| May 19 | 85°F | 60°F | 95°F 1951 | 43°F 1976 | 29% | 0% |
| May 20 | 85°F | 60°F | 93°F 1937 | 39°F 1894 | 29% | 0% |
| May 21 | 86°F | 61°F | 95°F 1937 | 43°F 1894 | 29% | 0% |
| May 22 | 86°F | 61°F | 95°F 1937 | 44°F 1993 | 29% | 0% |
| May 23 | 86°F | 61°F | 98°F 1925 | 47°F 1931 | 30% | 0% |
| May 24 | 86°F | 62°F | 95°F 2010 | 44°F 1931 | 30% | 0% |
| May 25 | 87°F | 62°F | 95°F 1941 | 47°F 1925 | 30% | 0% |
| May 26 | 87°F | 62°F | 96°F 1911 | 44°F 1925 | 30% | 0% |
| May 27 | 87°F | 62°F | 97°F 1953 | 39°F 1961 | 31% | 0% |
| May 28 | 87°F | 63°F | 98°F 1911 | 45°F 1901 | 31% | 0% |
| May 29 | 88°F | 63°F | 98°F 1911 | 48°F 1971 | 31% | 0% |
| May 30 | 88°F | 63°F | 98°F 1911 | 44°F 1984 | 32% | 0% |
| May 31 | 88°F | 63°F | 101°F 1951 | 46°F 1984 | 32% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (CDT).
- May 1
- sunrise 6:10 AM, sunset 7:38 PM
- May 31
- sunrise 5:50 AM, sunset 7:59 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00226308 (Newton Exp Stn), public domain. Records: NOAA GHCN-Daily, station USC00225247, 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.