The wettest September was in 1965 when 127.2mm of rain fell, followed by 1994 (104.8mm) and 1962 (97.7mm). September's average rainfall is 50.8mm.

The driest September was in 1996 when only 7.1mm of rain fell, followed by 1964 (8.4mm) and 1986 (8.6mm).

2006 had the highest average temperature for September (21.5°C), followed by 1999 (20.5°C) and 1991 (20.4°C).

The coldest September was in 1972, with an average maximum temperature of 15.3°C, followed by 1974 (15.5°C) and 1986 (16°C).

The overall average maximum temperature for September is 18.1°C.

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