May weather in Dillon, MT
The average temperature in Dillon in May is 50.3°F (36.1°F–64.4°F). Average precipitation: 1.93 inches.
May is a spring month in Dillon, and is warmer than the annual average of 42.8°F. Daily temperatures swing about 28.3°F between overnight low and afternoon high. Expect about 11 days with precipitation. Daylight averages about 14h 40m. For travel, May is cool.
Avg High
64.4°F
Avg Low
36.1°F
Precipitation
1.93 in
Snow
0.1 in
May records in Dillon
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 81.0°F (1985) | 17.1°F (1954) | 0.66 in (1938) |
| May 2 | 84.9°F (1947) | 15.1°F (1954) | 1.30 in (1912) |
| May 3 | 82.9°F (1966) | 19.0°F (1959) | 0.71 in (1933) |
| May 4 | 84.0°F (1966) | 23.0°F (1982) | 0.97 in (1975) |
| May 5 | 82.0°F (1966) | 18.0°F (1977) | 1.04 in (1918) |
| May 6 | 86.0°F (1992) | 19.0°F (1968) | 1.32 in (1995) |
| May 7 | 86.0°F (1992) | 21.0°F (1961) | 2.25 in (1896) |
| May 8 | 86.0°F (1987) | 19.0°F (1965) | 0.49 in (1948) |
| May 9 | 82.0°F (1928) | 19.0°F (1965) | 1.80 in (1908) |
| May 10 | 82.9°F (1940) | 19.0°F (2006) | 0.91 in (1967) |
| May 11 | 84.0°F (1993) | 15.1°F (1967) | 1.27 in (1981) |
| May 12 | 84.9°F (1988) | 21.0°F (1966) | 0.74 in (1989) |
| May 13 | 84.9°F (1993) | 17.1°F (1943) | 0.70 in (1896) |
| May 14 | 84.0°F (1987) | 19.9°F (1983) | 1.08 in (2025) |
| May 15 | 84.0°F (1912) | 19.9°F (1896) | 1.14 in (1955) |
| May 16 | 84.0°F (1901) | 21.0°F (1974) | 0.80 in (1900) |
| May 17 | 87.1°F (1901) | 19.0°F (1896) | 1.55 in (1977) |
| May 18 | 89.1°F (2009) | 21.0°F (1965) | 1.43 in (1944) |
| May 19 | 91.0°F (1954) | 19.9°F (2003) | 1.10 in (1948) |
| May 20 | 84.9°F (1958) | 24.1°F (2003) | 1.07 in (1907) |
| May 21 | 82.9°F (1919) | 24.1°F (1896) | 0.95 in (1962) |
| May 22 | 84.9°F (1967) | 26.1°F (1953) | 0.95 in (2008) |
| May 23 | 84.9°F (1919) | 24.1°F (1986) | 2.10 in (2021) |
| May 24 | 84.9°F (1919) | 27.0°F (1971) | 1.02 in (1917) |
| May 25 | 86.0°F (1999) | 21.9°F (1950) | 1.42 in (1980) |
| May 26 | 86.0°F (1986) | 26.1°F (1904) | 1.07 in (1908) |
| May 27 | 90.0°F (1986) | 24.1°F (1911) | 1.70 in (1922) |
| May 28 | 90.0°F (2003) | 25.0°F (1947) | 1.94 in (1982) |
| May 29 | 90.0°F (2003) | 21.9°F (1951) | 0.72 in (1979) |
| May 30 | 89.1°F (1986) | 28.9°F (1978) | 1.12 in (1988) |
| May 31 | 90.0°F (2025) | 25.0°F (1950) | 0.90 in (1935) |