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Williamstown Weather and Climate: A Comprehensive Guide

The climate in Williamstown is marked by big temperature swings throughout the year. Temperatures range from warm during the warmest months to mild in the cooler months. Williamstown has a dry climate with relatively low precipitation levels. Let's now guide you through the climate details for a complete overview.

Average maximum day and minimum night temperature

In Williamstown, temperatures differ significantly between summer and winter months. Average maximum daytime temperatures range from a comfortable 29°C in January, the warmest time of the year, to a moderate 15°C during cooler months like August.

At night, temperatures typically drop to an average of around 6°C during these months. Check out our detailed temperature page for more information.

Temperature ranges by month

Precipitation and rainy days

Williamstown's climate is marked by below-average rainfall, accumulating 472 mm of precipitation yearly. Significant seasonal changes in precipitation occur throughout the year. During the wetter season, September receives moderate rainfall, averaging 59 mm of precipitation, recorded across 9 rainy days. In contrast, the drier season, March brings less rainfall, with 18 mm over 6 rainy days. For more details, please visit our Williamstown Precipitation page.

The mean monthly precipitation over the year, including rain, hail and snow

Sunshine over the year

Seasonal changes in sunshine hours are quite dramatic in Williamstown. While January receives considerable daily sunshine with up to 10.9 hours, June marks the darkest time of the year, where sunshine is scarce with only 4.7 hours of sunlight per day. Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Data from: Adelaide, Australia (39 KM, 24 Miles).

Daily hours of sunshine

Data from: Adelaide, Australia (39 KM, 24 Miles).

Forecast for Williamstown

Wed   Jan 15
22°C | 13°C
SW 7 m/s
15 mm
partly cloudy and rain

partly cloudy and rain

Thu   Jan 16
22°C | 11°C
S 5 m/s
broken clouds and no rain

broken clouds and no rain

Fri   Jan 17
28°C | 12°C
SE 5 m/s
clear and no rain

clear and no rain

Select a Month of Interest

Check the conditions for any month of the year.

The best time of year to visit Williamstown in Australia

During the months of March, April, October and November you are most likely to experience good weather with pleasant average temperatures that fall between 20°C and 26°C.

Other facts from our historical weather data:
  • Which is the warmest month in Williamstown?
    January has an average maximum temperature of 29°C and is the warmest month of the year.
  • Which is the coldest month in Williamstown?
    The coldest month is August with an average maximum temperature of 15°C.
  • Which is the wettest month in Williamstown?
    September tops the wettest month list with 59 mm of rainfall.
  • Which is the driest month in Williamstown?
    March is the driest month with 18 mm of precipitation.
  • Which is the sunniest month in Williamstown?
    January is the sunniest month with an average of 326 hours of sunshine.

  • No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.