July weather in Boulder, CO
The average temperature in Boulder in July is 72.5°F (57.0°F–88.0°F). Average precipitation: 1.83 inches.
July is a summer month in Boulder, and is warmer than the annual average of 51.5°F. Daily temperatures swing about 31°F between overnight low and afternoon high. Expect about 11 days with precipitation. Daylight averages about 14h 35m. For travel, July is hot.
Avg High
88.0°F
Avg Low
57.0°F
Precipitation
1.83 in
Daylight
14h 35m
July records in Boulder
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| July 1 | 100.9°F (2002) | 45.0°F (1945) | 1.73 in (1945) |
| July 2 | 99.0°F (1990) | 45.0°F (1915) | 1.06 in (1915) |
| July 3 | 98.1°F (1953) | 43.0°F (1903) | 1.34 in (1919) |
| July 4 | 98.1°F (1989) | 39.9°F (1903) | 0.63 in (1921) |
| July 5 | 99.0°F (1989) | 42.1°F (1972) | 1.96 in (1894) |
| July 6 | 100.0°F (1973) | 44.1°F (1931) | 0.48 in (2015) |
| July 7 | 100.0°F (1951) | 41.0°F (1904) | 1.08 in (2010) |
| July 8 | 100.0°F (1989) | 44.1°F (1931) | 2.08 in (1906) |
| July 9 | 100.9°F (2025) | 46.0°F (1911) | 1.98 in (2012) |
| July 10 | 100.0°F (1954) | 46.0°F (1895) | 1.78 in (1983) |
| July 11 | 104.0°F (1954) | 44.1°F (1895) | 0.86 in (1895) |
| July 12 | 102.9°F (1954) | 46.9°F (1895) | 0.85 in (1895) |
| July 13 | 102.0°F (1954) | 44.1°F (1987) | 2.04 in (1930) |
| July 14 | 98.1°F (2024) | 46.9°F (1973) | 1.15 in (1912) |
| July 15 | 100.0°F (1925) | 46.9°F (1973) | 0.66 in (1929) |
| July 16 | 100.0°F (2003) | 46.9°F (1992) | 0.67 in (2012) |
| July 17 | 98.1°F (2002) | 46.0°F (1992) | 1.81 in (2000) |
| July 18 | 100.0°F (1998) | 48.9°F (1972) | 1.44 in (1913) |
| July 19 | 100.0°F (1934) | 46.0°F (1902) | 0.63 in (1985) |
| July 20 | 100.0°F (1998) | 45.0°F (1900) | 2.12 in (1990) |
| July 21 | 100.9°F (2005) | 48.0°F (1897) | 2.18 in (1977) |
| July 22 | 102.0°F (1931) | 46.9°F (1973) | 1.32 in (1943) |
| July 23 | 99.0°F (2005) | 46.9°F (1990) | 2.95 in (1929) |
| July 24 | 100.9°F (1953) | 48.9°F (1911) | 1.20 in (1938) |
| July 25 | 98.1°F (1931) | 48.9°F (1926) | 1.80 in (1977) |
| July 26 | 98.1°F (1935) | 48.0°F (1926) | 1.84 in (1907) |
| July 27 | 100.9°F (1947) | 48.0°F (1913) | 1.02 in (1982) |
| July 28 | 100.0°F (1947) | 52.0°F (1894) | 1.11 in (2022) |
| July 29 | 100.0°F (1947) | 46.0°F (1971) | 1.26 in (1953) |
| July 30 | 99.0°F (2024) | 45.0°F (1971) | 2.56 in (2014) |
| July 31 | 100.0°F (2002) | 46.9°F (2009) | 4.80 in (1919) |