Boise, ID Weather
Boise hourly forecast: next 24 hours
Today's high of 101°F (38°C) is about 7°F (4°C) above the typical July high of 94°F (34°C).
Current conditions in detail
Boise weather tomorrow (Saturday, July 18)
Tomorrow in Boise looks sunny, with a high of 101° and an overnight low of 69°. Rain is unlikely (1% chance). Winds top out near 12 mph, and the UV index reaches 10 (very high).
Boise 14-day forecast
About the weather in Boise
Boise has a semi-arid climate, marked by big day-to-night temperature swings and modest rainfall. Average daytime highs range from about 38°F (4°C) in December to around 94°F (34°C) in July, and the city records roughly 77 days of measurable precipitation a year.
Boise weather: quick facts
- Hottest month: July - highs near 94°F (34°C)
- Coldest month: December - highs near 38°F (4°C)
- Record high: 107°F (42°C) · Record low: -10°F (-23°C) (2015–2024)
- Wettest month: December (12 rainy days) · Sunniest: July (14.0 h sun/day)
- Climate type: semi-arid - big day-to-night temperature swings and modest rainfall
- Snow: about 18 days a year
Temperatures through the year
The warmest stretch of the year centers on July. Highs average 94°F (34°C) and overnight lows stay near 65°F (18°C). The coolest month is December, with typical highs of 38°F (4°C) and lows around 25°F (-4°C). Based on 2015–2024 weather data, temperatures have reached as high as 107°F (42°C) and dropped as low as -10°F (-23°C).
Rain, sun and snow
December is usually the wettest month. It brings about 2.2 inches (56 mm) of rain over 12 days, while July is the driest. July brings the most sunshine, averaging 14.0 hours of sun a day. Snow falls on about 18 days in a typical year, mostly from November through April.
Season by season
Spring (March through May)
Spring in Boise is crisp but comfortable, with daytime highs averaging 62°F (17°C) and nights around 40°F (5°C); expect showers on roughly 25 days across the season, plus around 3 snowy days.
Summer (June through August)
Summer in Boise runs hot, with daytime highs averaging 89°F (32°C) and nights around 62°F (17°C); precipitation is infrequent.
Fall (September through November)
Fall in Boise is mild, with daytime highs averaging 65°F (18°C) and nights around 43°F (6°C); rain falls on about 16 days over the three months.
Winter (December through February)
Winter in Boise is brisk and cold, with daytime highs averaging 41°F (5°C) and nights around 26°F (-3°C); expect showers on roughly 32 days across the season, plus around 14 snowy days.
Average temperatures in Boise by month
| Month | High | Low | Rain days | Precipitation | Sunshine | Humidity |
|---|---|---|---|---|---|---|
| January | 39° | 25° | 10 | 2.0 in | 6.4 h/day | 75% |
| February | 45° | 28° | 10 | 1.6 in | 7.5 h/day | 66% |
| March | 54° | 34° | 10 | 1.6 in | 9.2 h/day | 59% |
| April | 62° | 39° | 7 | 1.3 in | 10.9 h/day | 50% |
| May | 71° | 48° | 8 | 1.6 in | 12.2 h/day | 49% |
| June | 83° | 57° | 3 | 0.9 in | 13.4 h/day | 40% |
| July | 94° | 65° | 1 | 0.1 in | 14.0 h/day | 27% |
| August | 91° | 64° | 1 | 0.1 in | 12.9 h/day | 30% |
| September | 80° | 55° | 3 | 0.5 in | 11.1 h/day | 39% |
| October | 65° | 43° | 5 | 1.0 in | 9.2 h/day | 53% |
| November | 49° | 32° | 8 | 1.4 in | 7.1 h/day | 65% |
| December | 38° | 25° | 12 | 2.2 in | 5.6 h/day | 75% |