Boulder County Weather in July
Average highs run from 87°F on July 1 to 88°F on July 31, and lows from 55°F to 58°F. Normal precipitation for the month is 1.83 in over about 11 wet days.
July day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
July at a glance
- Average high
- 88°F
- Average low
- 57°F
- Precipitation
- 1.83 in
- Record high
- 104°FJul 11, 1954
- Record low
- 40°FJul 4, 1903
- Chance of a freeze
- 0%
- Days of 90°F or more
- 14.1
- Daylight
- 14 h 58 min to 14 h 17 min
- Cloud cover
- 57%
- Humidity
- 51%
- Dew point
- 39°F
- Wind
- 5.4 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.
| Date | Normal high | Normal low | Record high | Record low | Chance wet | Chance of snow |
|---|---|---|---|---|---|---|
| Jul 1 | 87°F | 55°F | 101°F 2002 | 45°F 1945 | 32% | 0% |
| Jul 2 | 87°F | 55°F | 99°F 1990 | 45°F 1915 | 32% | 0% |
| Jul 3 | 87°F | 55°F | 98°F 1953 | 43°F 1903 | 32% | 0% |
| Jul 4 | 87°F | 56°F | 98°F 1989 | 40°F 1903 | 32% | 0% |
| Jul 5 | 88°F | 56°F | 99°F 1989 | 42°F 1972 | 32% | 0% |
| Jul 6 | 88°F | 56°F | 100°F 1973 | 44°F 1931 | 32% | 0% |
| Jul 7 | 88°F | 56°F | 100°F 1951 | 41°F 1904 | 32% | 0% |
| Jul 8 | 88°F | 56°F | 100°F 1989 | 44°F 1931 | 32% | 0% |
| Jul 9 | 88°F | 57°F | 101°F 2025 | 46°F 1911 | 33% | 0% |
| Jul 10 | 88°F | 57°F | 100°F 1954 | 46°F 1895 | 33% | 0% |
| Jul 11 | 88°F | 57°F | 104°F 1954 | 44°F 1895 | 33% | 0% |
| Jul 12 | 88°F | 57°F | 103°F 1954 | 47°F 1895 | 33% | 0% |
| Jul 13 | 88°F | 57°F | 102°F 1954 | 44°F 1987 | 34% | 0% |
| Jul 14 | 88°F | 57°F | 98°F 2024 | 47°F 1973 | 34% | 0% |
| Jul 15 | 88°F | 57°F | 100°F 1925 | 47°F 1973 | 34% | 0% |
| Jul 16 | 88°F | 57°F | 100°F 2003 | 47°F 1992 | 34% | 0% |
| Jul 17 | 88°F | 58°F | 98°F 2002 | 46°F 1992 | 34% | 0% |
| Jul 18 | 88°F | 58°F | 100°F 1998 | 49°F 1972 | 35% | 0% |
| Jul 19 | 88°F | 58°F | 100°F 1934 | 46°F 1902 | 35% | 0% |
| Jul 20 | 88°F | 58°F | 101°F 2026 | 45°F 1900 | 35% | 0% |
| Jul 21 | 88°F | 58°F | 101°F 2005 | 48°F 1897 | 35% | 0% |
| Jul 22 | 88°F | 58°F | 102°F 1931 | 47°F 1973 | 36% | 0% |
| Jul 23 | 88°F | 58°F | 99°F 2005 | 47°F 1990 | 36% | 0% |
| Jul 24 | 88°F | 58°F | 101°F 1953 | 49°F 1911 | 36% | 0% |
| Jul 25 | 88°F | 58°F | 100°F 2026 | 49°F 1926 | 36% | 0% |
| Jul 26 | 88°F | 58°F | 102°F 2026 | 48°F 1926 | 37% | 0% |
| Jul 27 | 88°F | 58°F | 101°F 1947 | 48°F 1913 | 37% | 0% |
| Jul 28 | 88°F | 58°F | 100°F 1947 | 52°F 1894 | 37% | 0% |
| Jul 29 | 88°F | 58°F | 100°F 1947 | 46°F 1971 | 37% | 0% |
| Jul 30 | 88°F | 58°F | 99°F 2024 | 45°F 1971 | 37% | 0% |
| Jul 31 | 88°F | 58°F | 100°F 2002 | 47°F 2009 | 37% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (MDT).
- July 1
- sunrise 5:36 AM, sunset 8:34 PM
- July 31
- sunrise 5:59 AM, sunset 8:16 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00050848 (Boulder), public domain. Records: NOAA GHCN-Daily, station USC00050848, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.