Typical Weather in Boise, ID in August

90° F Avg High

59° F Avg Low

1 Rainy Days

☀️ Temperature Summary

August is a popular time to visit, with an inviting climate featuring warm temperatures. August is one of the warmer months of the year for Boise, with highs averaging around 90°F. Overnight lows will be around 59°F on average. Daily high temperatures can range between 91°F and 84°F for the month of August.

Be ready to seek shade during the day, as mid-day temperatures can be dangerous if you're caught without a way to cool off. If you want to avoid the August heat, you may consider visiting in September instead, when highs are often closer to 79°.

High Temps Throughout the Year

☔ Rain Summary

You can expect about a 2% chance of rain for any given day in August. It's one of the drier months of the year for Boise, with total rainfall for the month around 0 inches.