May weather in Boulder, UT
The average temperature in Boulder in May is 56.4°F (44.6°F–68.1°F). Average precipitation: 0.72 inches. Average snowfall is 0.4 inches.
May is a spring month in Boulder, and is warmer than the annual average of 50.3°F. Daily temperatures swing about 23.5°F between overnight low and afternoon high. Expect about 5 days with precipitation. Daylight averages about 14h 3m. For travel, May is a comfortable month to visit.
Avg High
68.1°F
Avg Low
44.6°F
Precipitation
0.72 in
Snow
0.4 in
May records in Boulder
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 80.1°F (2001) | 24.1°F (1967) | 0.80 in (1978) |
| May 2 | 80.1°F (2000) | 21.0°F (1973) | 0.48 in (2018) |
| May 3 | 82.0°F (2000) | 24.1°F (1955) | 0.26 in (2015) |
| May 4 | 80.1°F (2000) | 25.0°F (2001) | 0.22 in (1960) |
| May 5 | 79.0°F (2004) | 24.1°F (1964) | 0.69 in (2025) |
| May 6 | 82.9°F (2022) | 21.9°F (1975) | 0.50 in (1969) |
| May 7 | 81.0°F (1989) | 25.0°F (1968) | 0.64 in (1976) |
| May 8 | 82.9°F (1989) | 26.1°F (1986) | 0.69 in (1979) |
| May 9 | 82.0°F (1974) | 26.1°F (1990) | 0.23 in (2015) |
| May 10 | 81.0°F (1960) | 27.0°F (2003) | 0.28 in (2019) |
| May 11 | 82.9°F (1996) | 26.1°F (1991) | 0.52 in (1958) |
| May 12 | 86.0°F (1996) | 26.1°F (1957) | 0.54 in (1992) |
| May 13 | 86.0°F (1996) | 27.0°F (1967) | 0.67 in (1987) |
| May 14 | 82.0°F (1996) | 28.9°F (1998) | 0.47 in (1989) |
| May 15 | 81.0°F (1997) | 27.0°F (1962) | 1.20 in (2003) |
| May 16 | 80.1°F (1997) | 21.0°F (2000) | 0.31 in (1987) |
| May 17 | 82.0°F (2022) | 28.9°F (1977) | 0.21 in (2019) |
| May 18 | 82.9°F (2009) | 19.9°F (1977) | 0.15 in (1997) |
| May 19 | 87.1°F (2008) | 27.0°F (1977) | 0.15 in (2001) |
| May 20 | 84.9°F (2008) | 24.1°F (1959) | 0.50 in (1981) |
| May 21 | 81.0°F (1984) | 28.9°F (1957) | 0.55 in (1985) |
| May 22 | 87.1°F (2000) | 25.0°F (1975) | 0.35 in (2009) |
| May 23 | 89.1°F (2000) | 30.0°F (1975) | 1.07 in (2009) |
| May 24 | 84.9°F (2000) | 27.0°F (2010) | 0.59 in (1992) |
| May 25 | 84.9°F (2001) | 24.1°F (1980) | 0.58 in (1967) |
| May 26 | 84.0°F (1984) | 30.9°F (1980) | 0.59 in (1964) |
| May 27 | 86.0°F (2020) | 32.0°F (2012) | 0.53 in (2019) |
| May 28 | 88.0°F (2000) | 28.9°F (1955) | 0.24 in (1990) |
| May 29 | 88.0°F (2000) | 32.0°F (1980) | 0.40 in (1961) |
| May 30 | 89.1°F (2002) | 28.0°F (1971) | 0.73 in (1962) |
| May 31 | 89.1°F (2002) | 28.0°F (1989) | 0.56 in (1991) |