In August, Boise typically sees daytime highs of 29.8°C and overnight lows around 11.3°C. Compared to the annual average high of 15.8°C, August runs +14.0°C.
August in Boise averages a daytime high of 29.8°C and an overnight low of 11.3°C.
August runs +14.0°C compared to Boise's annual average high of 15.8°C, ranking #2 of 12 months by warmth.
Plan for daytime highs near 29.8°C and cooler evenings around 11.3°C.