In September, Spokane Valley typically sees daytime highs of 22.4°C and overnight lows around 6.9°C. Compared to the annual average high of 13.8°C, September runs +8.5°C.
September in Spokane Valley averages a daytime high of 22.4°C and an overnight low of 6.9°C.
September runs +8.5°C compared to Spokane Valley's annual average high of 13.8°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 22.4°C and cooler evenings around 6.9°C.