May weather in Ismay, MT
The average temperature in Ismay in May is 53.7°F (40.5°F–67.0°F). Average precipitation: 2.90 inches. Average snowfall is 1.3 inches.
May is a spring month in Ismay, and is warmer than the annual average of 44.2°F. Daily temperatures swing about 26.5°F between overnight low and afternoon high. Expect about 12 days with precipitation. Daylight averages about 14h 48m. For travel, May is a comfortable month to visit.
Avg High
67.0°F
Avg Low
40.5°F
Precipitation
2.90 in
Snow
1.3 in
May records in Ismay
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 88.0°F (1981) | 19.0°F (2004) | 3.12 in (2008) |
| May 2 | 88.0°F (1985) | 16.0°F (1976) | 0.39 in (2008) |
| May 3 | 90.0°F (1985) | 7.0°F (1954) | 0.71 in (1964) |
| May 4 | 91.9°F (1952) | 17.1°F (2002) | 0.79 in (2003) |
| May 5 | 91.0°F (1934) | 17.1°F (1931) | 0.54 in (1912) |
| May 6 | 87.1°F (1928) | 10.0°F (1929) | 1.65 in (1975) |
| May 7 | 95.0°F (1934) | 12.0°F (1945) | 1.21 in (2020) |
| May 8 | 93.0°F (1934) | 17.1°F (1923) | 1.74 in (2005) |
| May 9 | 89.1°F (1977) | 19.9°F (1946) | 1.25 in (1986) |
| May 10 | 89.1°F (1977) | 19.0°F (1983) | 1.94 in (1920) |
| May 11 | 91.0°F (2025) | 19.9°F (1968) | 1.07 in (1922) |
| May 12 | 91.9°F (2025) | 19.9°F (1943) | 1.25 in (1942) |
| May 13 | 95.0°F (2001) | 15.1°F (2004) | 1.15 in (1995) |
| May 14 | 93.0°F (1931) | 19.9°F (2016) | 1.15 in (2007) |
| May 15 | 95.0°F (1936) | 21.0°F (1921) | 0.50 in (1982) |
| May 16 | 93.0°F (1934) | 21.0°F (1925) | 1.07 in (2017) |
| May 17 | 90.0°F (1972) | 25.0°F (1916) | 0.95 in (2019) |
| May 18 | 95.0°F (1948) | 24.1°F (1971) | 0.55 in (2019) |
| May 19 | 93.0°F (1948) | 26.1°F (1931) | 1.30 in (2013) |
| May 20 | 97.0°F (1964) | 21.0°F (1968) | 1.79 in (2011) |
| May 21 | 93.0°F (1925) | 19.0°F (1963) | 1.27 in (2011) |
| May 22 | 98.1°F (1980) | 24.1°F (2022) | 1.32 in (1972) |
| May 23 | 91.0°F (1928) | 27.0°F (1917) | 2.83 in (1933) |
| May 24 | 95.0°F (1926) | 25.0°F (2002) | 1.11 in (2024) |
| May 25 | 98.1°F (1931) | 25.0°F (1950) | 1.03 in (1918) |
| May 26 | 99.0°F (1934) | 28.9°F (1947) | 2.09 in (1929) |
| May 27 | 98.1°F (1934) | 18.0°F (1947) | 1.11 in (1912) |
| May 28 | 98.1°F (1919) | 19.0°F (1947) | 1.19 in (1982) |
| May 29 | 100.0°F (1934) | 25.0°F (2016) | 2.39 in (1929) |
| May 30 | 95.0°F (1984) | 28.9°F (2017) | 2.92 in (2013) |
| May 31 | 93.9°F (1986) | 30.0°F (1917) | 1.00 in (2005) |