May weather in Eureka, MT
The average temperature in Eureka in May is 55.9°F (41.9°F–69.9°F). Average precipitation: 1.78 inches. Average snowfall is 0.2 inches.
May is a spring month in Eureka, and is warmer than the annual average of 47°F. Daily temperatures swing about 28°F between overnight low and afternoon high. Expect about 10 days with precipitation. Daylight averages about 15h 4m. For travel, May is a comfortable month to visit.
Avg High
69.9°F
Avg Low
41.9°F
Precipitation
1.78 in
Snow
0.2 in
May records in Eureka
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 86.0°F (2023) | 21.9°F (1973) | 1.31 in (1987) |
| May 2 | 88.0°F (2023) | 25.0°F (1991) | 1.16 in (1964) |
| May 3 | 87.1°F (2023) | 21.9°F (1967) | 0.30 in (1986) |
| May 4 | 86.0°F (1966) | 24.1°F (1963) | 0.52 in (1986) |
| May 5 | 86.0°F (1966) | 24.1°F (1967) | 0.54 in (1981) |
| May 6 | 89.1°F (1992) | 24.1°F (1977) | 0.23 in (1961) |
| May 7 | 88.0°F (1992) | 25.0°F (1965) | 0.26 in (1970) |
| May 8 | 88.0°F (1987) | 25.0°F (1965) | 0.52 in (1991) |
| May 9 | 84.9°F (1994) | 25.0°F (2002) | 0.64 in (1961) |
| May 10 | 84.9°F (1994) | 24.1°F (2002) | 0.52 in (1978) |
| May 11 | 89.1°F (1993) | 26.1°F (1963) | 0.26 in (1977) |
| May 12 | 91.9°F (1993) | 27.0°F (1973) | 0.46 in (2025) |
| May 13 | 90.0°F (1993) | 28.0°F (1985) | 0.85 in (2020) |
| May 14 | 89.1°F (1993) | 21.9°F (2008) | 0.91 in (2007) |
| May 15 | 89.1°F (1973) | 23.0°F (2008) | 1.04 in (1981) |
| May 16 | 89.1°F (2006) | 27.0°F (1977) | 0.30 in (2011) |
| May 17 | 91.9°F (2006) | 26.1°F (1966) | 0.42 in (2005) |
| May 18 | 91.9°F (2006) | 24.1°F (1966) | 0.57 in (1998) |
| May 19 | 90.0°F (2006) | 27.0°F (1977) | 0.28 in (2016) |
| May 20 | 89.1°F (2023) | 28.0°F (2001) | 0.90 in (1965) |
| May 21 | 84.0°F (1967) | 28.0°F (1975) | 1.13 in (2002) |
| May 22 | 91.0°F (1988) | 30.0°F (1987) | 1.50 in (2002) |
| May 23 | 93.9°F (2001) | 28.9°F (1978) | 1.11 in (2013) |
| May 24 | 91.9°F (2001) | 24.1°F (2006) | 0.56 in (1976) |
| May 25 | 90.0°F (2001) | 24.1°F (1964) | 1.08 in (1990) |
| May 26 | 93.9°F (1966) | 28.0°F (1964) | 0.89 in (1998) |
| May 27 | 93.9°F (1986) | 30.9°F (1975) | 1.36 in (1998) |
| May 28 | 91.0°F (1986) | 34.0°F (1975) | 0.38 in (1986) |
| May 29 | 91.9°F (1986) | 32.0°F (1989) | 0.88 in (1993) |
| May 30 | 90.0°F (1986) | 32.0°F (1979) | 0.89 in (1998) |
| May 31 | 93.0°F (2025) | 33.1°F (1979) | 0.57 in (1988) |