In September, Guildford typically sees daytime highs of 18.3°C and overnight lows around 9.6°C. Compared to the annual average high of 13.5°C, September runs +4.7°C.
September in Guildford averages a daytime high of 18.3°C and an overnight low of 9.6°C.
September runs +4.7°C compared to Guildford's annual average high of 13.5°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 18.3°C and cooler evenings around 9.6°C.