In September, St. Petersburg typically sees daytime highs of 31.0°C and overnight lows around 23.4°C. Compared to the annual average high of 26.6°C, September runs +4.3°C.
September in St. Petersburg averages a daytime high of 31.0°C and an overnight low of 23.4°C.
September runs +4.3°C compared to St. Petersburg's annual average high of 26.6°C, ranking #3 of 12 months by warmth.
Plan for daytime highs near 31.0°C and cooler evenings around 23.4°C.