Big Sky Weather in May
Average highs run from 53°F on May 1 to 62°F on May 31, and lows from 26°F to 34°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
- 58°F
- Average low
- 30°F
- Precipitation
- 2.83 in
- Snowfall
- 1.3 in
- Record high
- 94°FMay 28, 1919
- Record low
- 12°FMay 9, 2002
- Chance of a freeze
- 100%
- Daylight
- 14 h 18 min to 15 h 24 min
- Cloud cover
- 71%
- Humidity
- 69%
- Dew point
- 33°F
- Wind
- 5.4 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 | 53°F | 26°F | 83°F 2021 | 15°F 1954 | 40% | 7% |
| May 2 | 53°F | 26°F | 82°F 1947 | 13°F 2013 | 40% | 6% |
| May 3 | 54°F | 26°F | 85°F 1947 | 18°F 2019 | 40% | 6% |
| May 4 | 54°F | 27°F | 87°F 1966 | 18°F 1944 | 41% | 6% |
| May 5 | 54°F | 27°F | 87°F 1966 | 17°F 2006 | 41% | 6% |
| May 6 | 55°F | 27°F | 85°F 1992 | 17°F 2026 | 41% | 5% |
| May 7 | 55°F | 28°F | 85°F 1987 | 18°F 2012 | 42% | 5% |
| May 8 | 56°F | 28°F | 84°F 1987 | 19°F 2014 | 42% | 5% |
| May 9 | 56°F | 28°F | 82°F 1928 | 12°F 2002 | 42% | 5% |
| May 10 | 56°F | 28°F | 82°F 1940 | 21°F 1931 | 43% | 4% |
| May 11 | 57°F | 29°F | 86°F 1960 | 19°F 2016 | 43% | 4% |
| May 12 | 57°F | 29°F | 88°F 2001 | 21°F 1933 | 44% | 4% |
| May 13 | 57°F | 29°F | 87°F 2026 | 17°F 1943 | 44% | 4% |
| May 14 | 58°F | 30°F | 87°F 2026 | 20°F 1983 | 44% | 3% |
| May 15 | 58°F | 30°F | 87°F 1987 | 20°F 1929 | 45% | 3% |
| May 16 | 58°F | 30°F | 88°F 1927 | 21°F 1974 | 45% | 3% |
| May 17 | 59°F | 31°F | 87°F 2006 | 21°F 1943 | 46% | 3% |
| May 18 | 59°F | 31°F | 87°F 2006 | 21°F 1965 | 46% | 3% |
| May 19 | 59°F | 31°F | 92°F 1954 | 20°F 2003 | 47% | 2% |
| May 20 | 60°F | 31°F | 88°F 1958 | 25°F 1933 | 47% | 2% |
| May 21 | 60°F | 32°F | 85°F 1919 | 20°F 1918 | 48% | 2% |
| May 22 | 60°F | 32°F | 86°F 1919 | 27°F 1918 | 48% | 2% |
| May 23 | 61°F | 32°F | 84°F 1956 | 22°F 1930 | 49% | 2% |
| May 24 | 61°F | 32°F | 86°F 1922 | 27°F 1943 | 49% | 2% |
| May 25 | 61°F | 33°F | 87°F 1922 | 23°F 1950 | 49% | 2% |
| May 26 | 61°F | 33°F | 89°F 1928 | 25°F 1920 | 50% | 2% |
| May 27 | 62°F | 33°F | 89°F 1919 | 27°F 1932 | 50% | 1% |
| May 28 | 62°F | 33°F | 94°F 1919 | 26°F 1933 | 50% | 1% |
| May 29 | 62°F | 33°F | 92°F 2003 | 23°F 1947 | 50% | 1% |
| May 30 | 62°F | 34°F | 90°F 1936 | 24°F 1977 | 51% | 1% |
| May 31 | 62°F | 34°F | 90°F 2020 | 25°F 1982 | 51% | 1% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (MDT).
- May 1
- sunrise 6:14 AM, sunset 8:32 PM
- May 31
- sunrise 5:41 AM, sunset 9:05 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00240775 (Big Sky 2WNW), public domain. Records: NOAA GHCN-Daily, station USC00242793, 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.