May weather in Plains, MT
The average temperature in Plains in May is 53.6°F (38.3°F–69.0°F). Average precipitation: inches.
May is a spring month in Plains, and is warmer than the annual average of 46.2°F. Daily temperatures swing about 30.7°F between overnight low and afternoon high. Daylight averages about 14h 54m. For travel, May is a comfortable month to visit.
Avg High
69.0°F
Avg Low
38.3°F
Precipitation
in
Daylight
14h 54m
May records in Plains
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 82.0°F (1981) | 9.0°F (2013) | 0.42 in (1979) |
| May 2 | 84.0°F (1966) | 12.0°F (2013) | 0.46 in (1961) |
| May 3 | 88.0°F (1966) | 19.9°F (2013) | 0.36 in (1962) |
| May 4 | 88.0°F (1966) | 17.1°F (2013) | 0.51 in (1986) |
| May 5 | 89.1°F (1966) | 19.0°F (2013) | 0.68 in (1961) |
| May 6 | 87.1°F (1966) | 21.9°F (2010) | 0.73 in (1983) |
| May 7 | 87.1°F (1992) | 17.1°F (2013) | 0.39 in (1970) |
| May 8 | 88.0°F (1994) | 17.1°F (2013) | 0.48 in (1975) |
| May 9 | 86.0°F (1994) | 19.9°F (1986) | 0.63 in (1962) |
| May 10 | 84.9°F (1993) | 24.1°F (2006) | 0.63 in (2005) |
| May 11 | 90.0°F (1993) | 23.0°F (1968) | 0.92 in (2004) |
| May 12 | 91.9°F (1993) | 21.9°F (1982) | 0.35 in (1996) |
| May 13 | 90.0°F (1993) | 19.9°F (1983) | 0.30 in (1986) |
| May 14 | 91.9°F (1973) | 25.0°F (1986) | 0.40 in (1996) |
| May 15 | 90.0°F (1973) | 18.0°F (2013) | 0.22 in (1968) |
| May 16 | 91.0°F (2006) | 21.9°F (1974) | 1.48 in (1980) |
| May 17 | 91.9°F (2006) | 24.1°F (1986) | 0.32 in (1977) |
| May 18 | 90.0°F (2006) | 19.0°F (2013) | 0.56 in (1996) |
| May 19 | 89.1°F (2006) | 25.0°F (1986) | 0.30 in (1984) |
| May 20 | 82.9°F (1964) | 19.9°F (2013) | 0.55 in (2006) |
| May 21 | 90.0°F (1988) | 23.0°F (1975) | 1.04 in (2002) |
| May 22 | 88.0°F (1980) | 24.1°F (1986) | 0.87 in (1998) |
| May 23 | 91.9°F (2001) | 12.0°F (2013) | 0.70 in (1978) |
| May 24 | 93.0°F (2001) | 10.9°F (2013) | 0.70 in (1997) |
| May 25 | 91.0°F (1999) | 17.1°F (2013) | 0.78 in (1997) |
| May 26 | 96.1°F (1986) | 18.0°F (2013) | 0.98 in (1998) |
| May 27 | 91.9°F (1966) | 28.0°F (1973) | 0.95 in (1998) |
| May 28 | 91.9°F (1986) | 24.1°F (2013) | 0.79 in (2006) |
| May 29 | 91.9°F (1986) | 18.0°F (2013) | 0.55 in (1988) |
| May 30 | 93.0°F (1986) | 19.9°F (1996) | 1.06 in (1985) |
| May 31 | 96.1°F (1986) | 17.1°F (2013) | 1.17 in (2000) |