Boulder, CO weather in July
Expect hot weather with frequent rain in Boulder in July, with highs near 88°F and lows near 57°F. Rain falls on about 11 days. It is one of the warmest months in Boulder.
- Normal high
- 88°F
- Normal low
- 57°F
- Wet days
- 11
- 1.8 in total
- Muggy days
- 0
- dew point 65°F+
How July changes from start to finish
| July 1 | July 31 | |
|---|---|---|
| Normal high | 87°F | 88°F |
| Normal low | 55°F | 58°F |
| Chance of a wet day | 32% | 37% |
| Sunrise / sunset | 5:36 am / 8:33 pm | 5:58 am / 8:16 pm |
| Daylight | 15.0 h | 14.3 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Mountain Time).
A typical July day
- 6 am65°Fdew point 50°F
- 9 am77°Fdew point 50°F
- Noon85°Fdew point 46°F
- 3 pm86°Fdew point 45°F
- 6 pm80°Fdew point 48°F
- 9 pm71°Fdew point 50°F
NOAA hourly normals (local standard time) from Denver Intl Airport (35 mi away); average wind 10 mph; clear or few clouds in 42% of daytime hours, mostly cloudy or overcast in 33%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F3 of 31
- Hot dayshigh 90°F or more14 of 31
- Muggy daysdaily mean dew point 65°F or more0 of 31
- Wet daysat least 0.01 in of rain or melted snow11 of 31
- Notable rainat least 0.10 in4 of 31
- Freezing nightslow 32°F or below0 of 31
- Snow on the groundsnow depth 1 in or more0 of 31
Average days per July, counted from daily records for each year 1991-2020.
Rain in July
Normal precipitation is 1.8 in; a dry July brings about 0.8 in and a wet one about 2.6 in (25th and 75th percentiles). About 1 day brings half an inch or more.
How July varies from year to year
- Warmest July, 1991-20202002: average high 93°F
- Coolest July1992: average high 83°F
- Wettest July2012: 5.0 in
- Driest July2002: 0.09 in
- Highest reading101°F (July 21, 2005)
- Lowest reading44°F (July 3, 1992)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
July compared with June and August
| June | July | August | |
|---|---|---|---|
| Normal high | 83°F | 88°F | 86°F |
| Normal low | 51°F | 57°F | 56°F |
| Wet days | 10 | 11 | 11 |
| Comfortable days | 10 | 3 | 5 |
| Daylight | 15.0 h | 14.7 h | 13.7 h |
Highs change by +5°F from June and -2°F into August.
Nearby alternatives in July
- Warmer: Pueblo, CO127 mi · high 93°F · 9 wet days
- Drier: Thornton, CO19 mi · high 90°F · 7 wet days
- Cooler: Estes Park, CO28 mi · high 79°F · 14 wet days
How Boulder ranks in July
- Normal high179th warmest of 378 cities; 6th of 17 in Colorado
- Wet days252nd driest of 378
- Comfortable days149th most of 340
What to pack for Boulder in July
- Light, breathable clothing – highs near 88°F
- Layers – afternoons near 88°F but nights near 57°F
- A rain jacket or umbrella – rain on about 11 days
- Sunglasses and sunscreen – about 14.7 hours of daylight and highs near 88°F
Heating and cooling
July has 6 heating degree days and 238 cooling degree days (base 65°F), 4% of the year's total heating and cooling demand.
Questions
How hot is Boulder in July?
The normal high is 88°F and the normal low is 57°F. From 1991 to 2020 the hottest July reading was 101°F (most recently on July 21, 2005).
Does it rain a lot in Boulder in July?
About 11 days in July have at least 0.01 in of precipitation, and the normal total is 1.8 in. The wettest July in 1991-2020 was in 2012 (5.0 in); the driest was in 2002 (0.09 in).
Is July a good time to visit Boulder?
July ranks 9th of 12 months on our comfort score for Boulder (50 out of 100). It has about 3 comfortable days and about 14 days at 90°F or hotter. The best month is May.
Where the numbers come from
- Temperature, rain, snowfall, snow depth and frost dates: Boulder (USC00050848), 1.6 mi S of the city center, 5,484 ft (165 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour: Denver Intl Airport (USW00003017), 35 mi ESE of the city center, 5,414 ft (95 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Cloud cover: Aurora Buckley Fld ANGB (USW00023036), 35 mi SE of the city center, 5,663 ft (344 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Denver International Airport (725650-03017), 35 mi ESE of the city center, 5,404 ft (85 ft higher than the city). Hourly observations, 1991-2020.