Mandan Weather in May
Average highs run from 61°F on May 1 to 72°F on May 31, and lows from 36°F to 49°F. Normal precipitation for the month is 2.59 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
- 67°F
- Average low
- 43°F
- Precipitation
- 2.59 in
- Snowfall
- 0.4 in
- Record high
- 102°FMay 28, 1934
- Record low
- 13°FMay 3, 1967
- Chance of a freeze
- 90%
- Daylight
- 14 h 26 min to 15 h 35 min
- Cloud cover
- 63%
- Humidity
- 60%
- Dew point
- 40°F
- Wind
- 11.9 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 | 61°F | 36°F | 91°F 1992 | 20°F 1961 | 28% | 4% |
| May 2 | 61°F | 37°F | 85°F 1955 | 19°F 1967 | 28% | 4% |
| May 3 | 61°F | 37°F | 92°F 1955 | 13°F 1967 | 28% | 4% |
| May 4 | 62°F | 38°F | 95°F 1926 | 16°F 1967 | 29% | 4% |
| May 5 | 62°F | 38°F | 98°F 1926 | 17°F 1944 | 29% | 3% |
| May 6 | 63°F | 38°F | 88°F 1916 | 19°F 1931 | 29% | 3% |
| May 7 | 63°F | 39°F | 91°F 1934 | 21°F 1929 | 29% | 3% |
| May 8 | 63°F | 39°F | 96°F 1934 | 19°F 1945 | 30% | 3% |
| May 9 | 64°F | 40°F | 89°F 1985 | 21°F 1966 | 30% | 3% |
| May 10 | 64°F | 40°F | 89°F 1992 | 24°F 1945 | 30% | 2% |
| May 11 | 65°F | 41°F | 94°F 2025 | 20°F 2020 | 30% | 2% |
| May 12 | 65°F | 41°F | 94°F 2025 | 23°F 1918 | 30% | 2% |
| May 13 | 66°F | 41°F | 91°F 1932 | 25°F 1937 | 30% | 2% |
| May 14 | 66°F | 42°F | 90°F 1977 | 24°F 1953 | 30% | 2% |
| May 15 | 66°F | 42°F | 93°F 1936 | 23°F 2014 | 30% | 2% |
| May 16 | 67°F | 43°F | 94°F 1934 | 23°F 1925 | 31% | 2% |
| May 17 | 67°F | 43°F | 93°F 1934 | 26°F 1930 | 31% | 1% |
| May 18 | 67°F | 44°F | 98°F 1941 | 26°F 1915 | 31% | 1% |
| May 19 | 68°F | 44°F | 93°F 1948 | 25°F 2015 | 31% | 1% |
| May 20 | 68°F | 44°F | 89°F 1925 | 23°F 1931 | 31% | 1% |
| May 21 | 69°F | 45°F | 94°F 1925 | 26°F 1963 | 31% | 1% |
| May 22 | 69°F | 45°F | 95°F 1980 | 24°F 1963 | 32% | 1% |
| May 23 | 69°F | 46°F | 95°F 1928 | 28°F 1917 | 32% | 1% |
| May 24 | 70°F | 46°F | 97°F 1926 | 25°F 1924 | 32% | 1% |
| May 25 | 70°F | 46°F | 95°F 1941 | 23°F 1924 | 32% | 1% |
| May 26 | 70°F | 47°F | 93°F 1934 | 26°F 1984 | 33% | 1% |
| May 27 | 71°F | 47°F | 101°F 1934 | 28°F 1917 | 33% | 0% |
| May 28 | 71°F | 48°F | 102°F 1934 | 23°F 1947 | 33% | 0% |
| May 29 | 71°F | 48°F | 98°F 1934 | 25°F 1947 | 33% | 0% |
| May 30 | 72°F | 48°F | 102°F 1934 | 30°F 1947 | 34% | 0% |
| May 31 | 72°F | 49°F | 92°F 1936 | 29°F 1964 | 34% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (CDT).
- May 1
- sunrise 6:28 AM, sunset 8:54 PM
- May 31
- sunrise 5:54 AM, sunset 9:29 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00325479 (Mandan Exp Stn), public domain. Records: NOAA GHCN-Daily, station USC00325479, 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.