Flathead County Weather in May
Average highs run from 59°F on May 1 to 67°F on May 31, and lows from 36°F to 45°F. Normal precipitation for the month is 2.87 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
- 64°F
- Average low
- 41°F
- Precipitation
- 2.87 in
- Snowfall
- 0.1 in
- Record high
- 95°FMay 27, 1936
- Record low
- 17°FMay 1, 1899
- Chance of a freeze
- 75%
- Daylight
- 14 h 34 min to 15 h 48 min
- Cloud cover
- 70%
- Humidity
- 78%
- Dew point
- 35°F
- Wind
- 5.1 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 | 59°F | 36°F | 86°F 2023 | 17°F 1899 | 38% | 1% |
| May 2 | 59°F | 36°F | 85°F 2023 | 20°F 2013 | 38% | 1% |
| May 3 | 59°F | 36°F | 82°F 1966 | 23°F 2001 | 38% | 1% |
| May 4 | 60°F | 37°F | 85°F 2023 | 22°F 1963 | 38% | 1% |
| May 5 | 60°F | 37°F | 85°F 1966 | 25°F 2020 | 38% | 1% |
| May 6 | 61°F | 37°F | 82°F 1953 | 22°F 1999 | 38% | 1% |
| May 7 | 61°F | 38°F | 82°F 1992 | 24°F 2000 | 38% | 1% |
| May 8 | 61°F | 38°F | 82°F 1987 | 21°F 1999 | 38% | 1% |
| May 9 | 62°F | 38°F | 83°F 1994 | 22°F 2002 | 38% | 1% |
| May 10 | 62°F | 39°F | 85°F 1936 | 23°F 2006 | 38% | 0% |
| May 11 | 63°F | 39°F | 87°F 1993 | 21°F 2012 | 38% | 0% |
| May 12 | 63°F | 39°F | 90°F 1993 | 23°F 1953 | 38% | 0% |
| May 13 | 63°F | 40°F | 87°F 1993 | 24°F 1983 | 38% | 0% |
| May 14 | 64°F | 40°F | 85°F 1993 | 21°F 2022 | 38% | 0% |
| May 15 | 64°F | 40°F | 85°F 1924 | 25°F 2013 | 38% | 0% |
| May 16 | 64°F | 41°F | 86°F 1973 | 26°F 1992 | 39% | 0% |
| May 17 | 65°F | 41°F | 86°F 1973 | 25°F 2003 | 39% | 0% |
| May 18 | 65°F | 41°F | 87°F 2006 | 25°F 1966 | 39% | 0% |
| May 19 | 65°F | 42°F | 87°F 2002 | 26°F 2021 | 40% | 0% |
| May 20 | 65°F | 42°F | 85°F 1897 | 28°F 2001 | 40% | 0% |
| May 21 | 66°F | 42°F | 86°F 1919 | 25°F 2001 | 40% | 0% |
| May 22 | 66°F | 43°F | 86°F 1919 | 25°F 2022 | 41% | 0% |
| May 23 | 66°F | 43°F | 87°F 2001 | 26°F 1953 | 41% | 0% |
| May 24 | 66°F | 43°F | 89°F 1934 | 28°F 1964 | 41% | 0% |
| May 25 | 66°F | 43°F | 87°F 1961 | 24°F 1964 | 41% | 0% |
| May 26 | 67°F | 44°F | 90°F 1986 | 25°F 1918 | 42% | 0% |
| May 27 | 67°F | 44°F | 95°F 1936 | 28°F 1918 | 42% | 0% |
| May 28 | 67°F | 44°F | 91°F 1986 | 31°F 1914 | 42% | 0% |
| May 29 | 67°F | 44°F | 94°F 1936 | 28°F 1951 | 43% | 0% |
| May 30 | 67°F | 45°F | 95°F 1936 | 26°F 2001 | 43% | 0% |
| May 31 | 67°F | 45°F | 92°F 1986 | 28°F 1950 | 43% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (MDT).
- May 1
- sunrise 6:17 AM, sunset 8:51 PM
- May 31
- sunrise 5:40 AM, sunset 9:28 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00244328 (Hungry Horse Dam), public domain. Records: NOAA GHCN-Daily, station USC00244558, 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.