In September, Greeley typically sees daytime highs of 26.6°C and overnight lows around 7.6°C. Compared to the annual average high of 18.5°C, September runs +8.0°C.
September in Greeley averages a daytime high of 26.6°C and an overnight low of 7.6°C.
September runs +8.0°C compared to Greeley's annual average high of 18.5°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 26.6°C and cooler evenings around 7.6°C.