In September, Lethbridge typically sees daytime highs of 19.8°C and overnight lows around 5.0°C. Compared to the annual average high of 11.9°C, September runs +7.9°C.
September in Lethbridge averages a daytime high of 19.8°C and an overnight low of 5.0°C.
September runs +7.9°C compared to Lethbridge's annual average high of 11.9°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 19.8°C and cooler evenings around 5.0°C.