May weather in Forsyth, MT
The average temperature in Forsyth in May is 55.8°F (42.8°F–68.8°F). Average precipitation: 2.92 inches. Average snowfall is 0.4 inches.
May is a spring month in Forsyth, and is warmer than the annual average of 46.7°F. Daily temperatures swing about 26°F between overnight low and afternoon high. Expect about 11 days with precipitation. Daylight averages about 14h 47m. For travel, May is a comfortable month to visit.
Avg High
68.8°F
Avg Low
42.8°F
Precipitation
2.92 in
Snow
0.4 in
May records in Forsyth
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 91.0°F (1981) | 23.0°F (2005) | 1.66 in (2008) |
| May 2 | 93.0°F (1985) | 27.0°F (1976) | 0.26 in (2021) |
| May 3 | 88.0°F (1986) | 19.9°F (2008) | 1.14 in (2007) |
| May 4 | 87.1°F (2016) | 24.1°F (2024) | 0.75 in (2003) |
| May 5 | 89.1°F (2016) | 25.0°F (2006) | 1.09 in (1986) |
| May 6 | 91.9°F (2017) | 28.9°F (1985) | 2.02 in (2024) |
| May 7 | 89.1°F (1992) | 27.0°F (1984) | 1.98 in (2024) |
| May 8 | 91.0°F (1987) | 25.0°F (1979) | 0.92 in (2024) |
| May 9 | 88.0°F (1977) | 26.1°F (2002) | 1.10 in (1986) |
| May 10 | 90.0°F (1977) | 26.1°F (1979) | 2.88 in (2016) |
| May 11 | 90.0°F (2025) | 27.0°F (2015) | 1.07 in (1981) |
| May 12 | 91.9°F (1987) | 28.0°F (1983) | 1.09 in (1983) |
| May 13 | 98.1°F (2001) | 19.0°F (2004) | 1.57 in (1995) |
| May 14 | 90.0°F (1987) | 26.1°F (1983) | 0.81 in (2024) |
| May 15 | 91.0°F (1978) | 30.0°F (1983) | 1.17 in (1977) |
| May 16 | 91.0°F (1988) | 30.9°F (1986) | 0.32 in (1994) |
| May 17 | 87.1°F (1997) | 30.0°F (1986) | 0.96 in (1978) |
| May 18 | 93.0°F (1992) | 30.9°F (1999) | 0.99 in (1978) |
| May 19 | 91.9°F (1992) | 24.1°F (1997) | 0.78 in (2025) |
| May 20 | 90.0°F (1980) | 30.0°F (2003) | 0.72 in (1987) |
| May 21 | 96.1°F (1980) | 30.0°F (1992) | 0.76 in (2016) |
| May 22 | 99.0°F (1980) | 28.0°F (2022) | 1.51 in (2007) |
| May 23 | 93.0°F (1980) | 30.9°F (2002) | 1.60 in (2008) |
| May 24 | 91.9°F (1985) | 30.0°F (2002) | 1.62 in (2010) |
| May 25 | 89.1°F (2003) | 30.9°F (2004) | 1.51 in (1997) |
| May 26 | 91.0°F (1998) | 30.9°F (2004) | 1.32 in (1995) |
| May 27 | 90.0°F (1979) | 37.0°F (2011) | 1.25 in (1987) |
| May 28 | 93.9°F (2014) | 37.0°F (1997) | 0.99 in (2018) |
| May 29 | 98.1°F (1988) | 37.0°F (1982) | 1.25 in (2013) |
| May 30 | 95.0°F (1984) | 32.0°F (1982) | 2.02 in (2013) |
| May 31 | 93.0°F (1986) | 36.0°F (1983) | 1.25 in (2013) |