In September, Nampa typically sees daytime highs of 26.6°C and overnight lows around 7.9°C. Compared to the annual average high of 18.2°C, September runs +8.4°C.
September in Nampa averages a daytime high of 26.6°C and an overnight low of 7.9°C.
September runs +8.4°C compared to Nampa's annual average high of 18.2°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 26.6°C and cooler evenings around 7.9°C.