Glacier County Weather in May
Average highs run from 51°F on May 1 to 59°F on May 31, and lows from 32°F to 39°F. Normal precipitation for the month is 2.83 in over about 13 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
- 56°F
- Average low
- 35°F
- Precipitation
- 2.83 in
- Record high
- 92°FMay 31, 2025
- Record low
- 9°FMay 2, 1954
- Chance of a freeze
- 100%
- Daylight
- 14 h 35 min to 15 h 52 min
- Cloud cover
- 70%
- Humidity
- 72%
- Dew point
- 35°F
- Wind
- 7.8 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 | 51°F | 32°F | 77°F 1914 | 12°F 1954 | 42% |
| May 2 | 51°F | 32°F | 83°F 1985 | 9°F 1954 | 42% |
| May 3 | 52°F | 32°F | 81°F 2023 | 10°F 1967 | 42% |
| May 4 | 52°F | 33°F | 81°F 1966 | 12°F 1967 | 42% |
| May 5 | 53°F | 33°F | 85°F 1911 | 15°F 1967 | 42% |
| May 6 | 53°F | 33°F | 85°F 1992 | 18°F 1929 | 42% |
| May 7 | 53°F | 33°F | 84°F 1992 | 18°F 1914 | 42% |
| May 8 | 54°F | 34°F | 82°F 1987 | 21°F 1909 | 42% |
| May 9 | 54°F | 34°F | 87°F 1940 | 18°F 1918 | 42% |
| May 10 | 54°F | 34°F | 86°F 1940 | 14°F 1946 | 42% |
| May 11 | 55°F | 34°F | 86°F 1993 | 15°F 1904 | 42% |
| May 12 | 55°F | 35°F | 85°F 1960 | 18°F 1983 | 42% |
| May 13 | 55°F | 35°F | 84°F 1931 | 21°F 1916 | 42% |
| May 14 | 56°F | 35°F | 88°F 1931 | 24°F 1916 | 42% |
| May 15 | 56°F | 35°F | 87°F 2012 | 20°F 1929 | 42% |
| May 16 | 56°F | 36°F | 86°F 2006 | 20°F 1992 | 42% |
| May 17 | 57°F | 36°F | 87°F 2006 | 13°F 1909 | 43% |
| May 18 | 57°F | 36°F | 87°F 2006 | 13°F 1909 | 43% |
| May 19 | 57°F | 36°F | 85°F 1964 | 27°F 1929 | 43% |
| May 20 | 57°F | 36°F | 84°F 1925 | 24°F 1931 | 43% |
| May 21 | 58°F | 37°F | 91°F 1980 | 24°F 2001 | 44% |
| May 22 | 58°F | 37°F | 83°F 1928 | 24°F 2022 | 44% |
| May 23 | 58°F | 37°F | 86°F 1941 | 25°F 1949 | 44% |
| May 24 | 58°F | 37°F | 87°F 2001 | 15°F 1904 | 44% |
| May 25 | 58°F | 38°F | 90°F 1928 | 25°F 1904 | 45% |
| May 26 | 59°F | 38°F | 88°F 1928 | 17°F 1918 | 45% |
| May 27 | 59°F | 38°F | 91°F 1936 | 27°F 1904 | 45% |
| May 28 | 59°F | 38°F | 90°F 1934 | 25°F 1947 | 45% |
| May 29 | 59°F | 38°F | 90°F 1936 | 23°F 1951 | 45% |
| May 30 | 59°F | 39°F | 89°F 1936 | 25°F 1924 | 45% |
| May 31 | 59°F | 39°F | 92°F 2025 | 28°F 1979 | 45% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (MDT).
- May 1
- sunrise 6:12 AM, sunset 8:47 PM
- May 31
- sunrise 5:34 AM, sunset 9:26 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00004130 (St. Mary 1 Ssw), public domain. Records: NOAA GHCN-Daily, station USW00024137, 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.