Plains Weather in May
Average highs run from 66°F on May 1 to 74°F on May 31, and lows from 35°F to 44°F. Normal precipitation for the month is 1.80 in over about 10 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
- 71°F
- Average low
- 40°F
- Precipitation
- 1.80 in
- Record high
- 99°FMay 30, 1936
- Record low
- 17°FMay 25, 1998
- Chance of a freeze
- 89%
- Days of 90°F or more
- 0.9
- Daylight
- 14 h 29 min to 15 h 41 min
- Cloud cover
- 68%
- Humidity
- 71%
- Dew point
- 38°F
- Wind
- 4.5 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 | 66°F | 35°F | 82°F 1985 | 21°F 1954 | 32% | |
| May 2 | 66°F | 36°F | 87°F 1966 | 20°F 1916 | 32% | |
| May 3 | 67°F | 36°F | 88°F 1966 | 24°F 1919 | 32% | |
| May 4 | 67°F | 36°F | 90°F 1966 | 24°F 1919 | 32% | |
| May 5 | 68°F | 37°F | 89°F 1966 | 19°F 1984 | 32% | |
| May 6 | 68°F | 37°F | 88°F 1966 | 22°F 1929 | 32% | |
| May 7 | 68°F | 37°F | 89°F 1947 | 23°F 1929 | 32% | |
| May 8 | 69°F | 38°F | 89°F 1987 | 20°F 1998 | 32% | |
| May 9 | 69°F | 38°F | 90°F 1949 | 24°F 1935 | 32% | |
| May 10 | 69°F | 38°F | 91°F 1940 | 21°F 1946 | 32% | |
| May 11 | 70°F | 39°F | 90°F 1949 | 25°F 1918 | 32% | |
| May 12 | 70°F | 39°F | 94°F 1993 | 21°F 2008 | 33% | |
| May 13 | 70°F | 39°F | 92°F 1931 | 24°F 1919 | 33% | |
| May 14 | 71°F | 39°F | 92°F 1931 | 26°F 1916 | 33% | |
| May 15 | 71°F | 40°F | 92°F 1939 | 26°F 1916 | 34% | |
| May 16 | 71°F | 40°F | 92°F 2006 | 25°F 1916 | 34% | |
| May 17 | 72°F | 40°F | 93°F 2006 | 25°F 2003 | 34% | 0% |
| May 18 | 72°F | 41°F | 93°F 2006 | 26°F 1929 | 35% | 0% |
| May 19 | 72°F | 41°F | 93°F 2006 | 28°F 1931 | 35% | 0% |
| May 20 | 72°F | 41°F | 89°F 1958 | 27°F 1933 | 35% | 0% |
| May 21 | 73°F | 41°F | 90°F 1928 | 25°F 1934 | 35% | 0% |
| May 22 | 73°F | 42°F | 90°F 1988 | 23°F 1918 | 36% | 0% |
| May 23 | 73°F | 42°F | 91°F 1941 | 26°F 1916 | 36% | 0% |
| May 24 | 73°F | 42°F | 94°F 1934 | 25°F 1918 | 36% | 0% |
| May 25 | 73°F | 42°F | 96°F 2001 | 17°F 1998 | 37% | 0% |
| May 26 | 74°F | 43°F | 95°F 1966 | 24°F 1918 | 37% | 0% |
| May 27 | 74°F | 43°F | 95°F 1986 | 22°F 1918 | 37% | 0% |
| May 28 | 74°F | 43°F | 94°F 1934 | 24°F 1918 | 37% | 0% |
| May 29 | 74°F | 43°F | 96°F 1986 | 26°F 1951 | 37% | 0% |
| May 30 | 74°F | 43°F | 99°F 1936 | 27°F 1916 | 38% | 0% |
| May 31 | 74°F | 44°F | 97°F 1936 | 26°F 1926 | 38% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (MDT).
- May 1
- sunrise 6:23 AM, sunset 8:52 PM
- May 31
- sunrise 5:47 AM, sunset 9:28 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00024159 (Superior), public domain. Records: NOAA GHCN-Daily, station USW00024159, 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.