Boise, Idaho, United States climate
Average temperatures, precipitation and all-time records for Boise, Idaho, United States, with every day graded against ~46 years of local climate history (1980–2026). Its warmest month is July, averaging a high of 94°F, and its coldest is January, with an average low of 27°F.
Boise is the capital and most populous city in the U.S. state of Idaho. It is the county seat of Ada County. The population of the city was 235,685 at the 2020 census. via Wikipedia
How today compares
Latest recorded day: 2026-07-24. Each reading placed on Boise, Idaho, United States's own ±7-day seasonal distribution.
Boise average temperatures by month
Typical daily high and low, and average precipitation, for each month in Boise, Idaho, United States, based on 1980–2026 records. The wettest month is January (0.10 in on an average day).
| Month | Avg high | Avg low | Avg precip |
|---|---|---|---|
| January | 40°F | 27°F | 0.10 in |
| February | 47°F | 31°F | 0.10 in |
| March | 57°F | 37°F | 0.10 in |
| April | 65°F | 41°F | 0.00 in |
| May | 73°F | 48°F | 0.00 in |
| June | 82°F | 54°F | 0.00 in |
| July | 94°F | 63°F | 0.00 in |
| August | 93°F | 62°F | 0.00 in |
| September | 81°F | 53°F | 0.00 in |
| October | 68°F | 44°F | 0.00 in |
| November | 51°F | 35°F | 0.10 in |
| December | 40°F | 27°F | 0.10 in |
Each bar spans the 10th-percentile daily low to the 90th-percentile daily high (the range most days fall within), coloured cold → hot on a shared -10°F to 115°F scale, so the whole year's rhythm reads at a glance.
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Record extremes
- Hottest day on record: 109°F on 2002-07-11
- Coldest day on record: -25°F on 1990-12-22
Percentiles compare each day to Boise, Idaho, United States's own history, so grades are relative to this location: a “Near Record” day here isn't the same temperature as elsewhere. How the grades work →