Boise weather in August
August in Boise: hot, dry — an excellent time to visit.
#5 of 12 months in Boise · #209 of 604 destinations to visit in August · comfort 84/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Boise climate normals — August
| Daytime high | 34°C / 93°F | 🥵 hot |
|---|---|---|
| Nighttime low | 19°C / 65°F | |
| Feels like (high) | 32°C / 90°F | |
| Rainfall | 10 mm / 0.4 in | ☀️ dry |
| Rainy days | 2 days | |
| Humidity | 38% | 🌵 dry |
| Dew point | 9°C / 49°F | |
| Sunshine | 12.5 h/day | |
| Daylight | 13.9 h | |
| Wind | 17 km/h / 11 mph | |
| Air quality (US AQI) | 52 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Boise?
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Boise in August — FAQ
- Is August a good time to visit Boise?
- August in Boise: hot, dry — an excellent time to visit. It ranks #5 of 12 months for Boise on SeasonMap's comfort score (84/100).
- What is the weather like in Boise in August?
- In August, Boise averages a daily high of 33.7°C and a low of 18.6°C, with about 9.9 mm of rain over roughly 1.6 rainy days.
- What is the air quality in Boise in August?
- Boise has a mean US Air Quality Index of about 52 in August.