Williamstown Weather in September

With daytime temperatures of 17°C (63°F) and nighttime lows of 8°C (46°F), September in Williamstown brings moderate temperatures during the day. It is also the wettest month of the year, so pack an umbrella.

Rainfall in Williamstown in September

An umbrella might come in handy since it is the wettest month of the year. Rain is expected on roughly 10 days, totalling around 68 mm (2.7 in) for the month. Expect a fairly normal spread of rainfall this month, with no particular pattern of very heavy or very persistent showers.

Temperature in Williamstown in September

Daytime temperatures in Williamstown reach 17°C (63°F) in September, dropping to 8°C (46°F) at night. The difference between afternoon and evening temperatures is usually noticeable. Nights fall to 8°C (46°F), which is cold enough to feel it indoors too. A good thick duvet makes all the difference for a comfortable night's sleep.

Sunshine in Williamstown in September

The city usually sees around 185 hours of sunlight, indicating a moderately sunny period.

Wind Speed in Williamstown in September

September has wind speeds averaging 3 m/s (6 knots). You can expect comfortable light winds that steadily move flags and feel mild throughout the day. Since this is an average, daily conditions vary from gentle winds to more active breezes.

Average water temperature in September

With water at 13°C (55°F), it's on the cooler side. Keen swimmers won't be put off, but those who prefer warm water may find it less enjoyable.

If you prefer dry days with pleasant temperatures, September may not be the ideal month to visit Williamstown. Our weather planner can help you explore destinations with more pleasant weather conditions.