Boise, ID weather in July
Boise is hot and dry in July: highs average 93°F and nights drop to about 62°F. There are about 2 days with rain. This is the peak of the warm season in Boise. Midday heat is the main thing to plan around.
- Normal high
- 93°F
- Normal low
- 62°F
- Wet days
- 2
- 0.2 in total
- Muggy days
- 0
- dew point 65°F+
How July changes from start to finish
| July 1 | July 31 | |
|---|---|---|
| Normal high | 88°F | 95°F |
| Normal low | 58°F | 64°F |
| Chance of a wet day | 10% | 7% |
| Sunrise / sunset | 6:07 am / 9:30 pm | 6:33 am / 9:09 pm |
| Daylight | 15.4 h | 14.6 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 am63°Fdew point 44°F
- 9 am74°Fdew point 45°F
- Noon84°Fdew point 44°F
- 3 pm90°Fdew point 41°F
- 6 pm90°Fdew point 39°F
- 9 pm81°Fdew point 43°F
NOAA hourly normals (local standard time) from Boise Air Terminal (4 mi away); average wind 7 mph; clear or few clouds in 93% of daytime hours, mostly cloudy or overcast in 5%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F2 of 31
- Hot dayshigh 90°F or more22 of 31
- Muggy daysdaily mean dew point 65°F or more0 of 31
- Wet daysat least 0.01 in of rain or melted snow2 of 31
- Notable rainat least 0.10 in1 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 0.2 in; a dry July brings about 0.03 in and a wet one about 0.3 in (25th and 75th percentiles). Days with half an inch or more are rare.
How July varies from year to year
- Warmest July, 1991-20202007: average high 99°F
- Coolest July1993: average high 80°F
- Wettest July2015: 1.0 in
- Driest July1999: no measurable precipitation
- Highest reading110°F (July 1, 2013)
- Lowest reading42°F (July 18, 1993)
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 | 81°F | 93°F | 91°F |
| Normal low | 54°F | 62°F | 61°F |
| Wet days | 5 | 2 | 2 |
| Comfortable days | 12 | 2 | 3 |
| Daylight | 15.4 h | 15.1 h | 13.9 h |
Highs change by +12°F from June and -2°F into August.
Nearby alternatives in July
- Cooler: Sun Valley, ID93 mi · high 80°F · 4 wet days
How Boise ranks in July
- Normal high89th warmest of 378 cities; 1st of 2 in Idaho
- Wet days63rd driest of 378
- Comfortable days155th most of 340
What to pack for Boise in July
- Light, breathable clothing – highs near 93°F
- Layers – afternoons near 93°F but nights near 62°F
- Sunglasses and sunscreen – about 15.1 hours of daylight and highs near 93°F
Heating and cooling
July has 5 heating degree days and 386 cooling degree days (base 65°F), 6% of the year's total heating and cooling demand.
Questions
How hot is Boise in July?
The normal high is 93°F and the normal low is 62°F. From 1991 to 2020 the hottest July reading was 110°F (most recently on July 1, 2013).
Does it rain a lot in Boise in July?
About 2 days in July have at least 0.01 in of precipitation, and the normal total is 0.2 in. The wettest July in 1991-2020 was in 2015 (1.0 in); the driest was in 1999, with no measurable precipitation.
Is July a good time to visit Boise?
July ranks 7th of 12 months on our comfort score for Boise (48 out of 100). It has about 2 comfortable days and about 22 days at 90°F or hotter. The best month is May.
Where the numbers come from
- Temperature, rain, snowfall, snow depth, frost dates, humidity and wind by hour and cloud cover: Boise Air Terminal (USW00024131), 3.7 mi SSW of the city center, 2,814 ft (114 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Boise Air Terminal/Gowen Fd Airport (726810-24131), 3.7 mi SSW of the city center, 2,823 ft (123 ft higher than the city). Hourly observations, 1991-2020.