In September, Idah typically sees daytime highs of 29.5°C and overnight lows around 22.3°C. Compared to the annual average high of 31.9°C, September runs -2.4°C.
September in Idah averages a daytime high of 29.5°C and an overnight low of 22.3°C.
September runs -2.4°C compared to Idah's annual average high of 31.9°C, ranking #10 of 12 months by warmth.
Plan for daytime highs near 29.5°C and cooler evenings around 22.3°C.