Williamstown Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Williamstown.
Climate overview of Williamstown
Williamstown, Victoria, Australia, sees big temperature differences between seasons, with January peaking at 25°C (77°F) and July dropping to 14°C (57°F).
Annual rainfall is moderate at around 685 mm (27 in), with September being the wettest month. Sunshine peaks in January, when the city sees around 9.2 hours of sunshine per day.
Williamstown Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Williamstown — and find the best time to visit.
Monthly Temperature in Williamstown
Visitors to Williamstown can expect significant temperature changes throughout the year. Average daytime temperatures reach a comfortable 25°C (77°F) in January. In July, the coolest month of the year, temperatures drop to a moderate 14°C (57°F).
At night, temperatures range from around 15°C (59°F) in January to 7°C (45°F) in July.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Williamstown
Generally, Williamstown experiences moderate precipitation patterns, averaging 685 mm (27 in) yearly. Williamstown experiences moderate seasonal variation in rainfall, with monthly averages ranging from 68 mm (2.7 in) in September, the wettest month, and 40 mm (1.6 in) in March, the driest month. For more details, please visit our Williamstown Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Williamstown
Williamstown can be enjoyed more throughout the sunniest month of January under a blue sky, with approximately 9.2 hours of sunshine daily. In contrast, the city experiences much darker days in June, with only 4.1 hours of sunlight per day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Water Temperature in Williamstown
The mean water temperature over the year ranges from 13°C (55°F) in August to 17°C (63°F) in January.
Water temperature over the year
Humidity in Williamstown by Month
The relative humidity is moderate throughout the year in Williamstown.
The city experiences its highest humidity in June, reaching 64%. In January, the humidity drops to its lowest level at 44%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Wind Speed in Williamstown
The mean wind speed over the year ranges from 3 m/s (6 knots) in January, February, March, April, May, June, July, August, September, October, November and December to 3 m/s (6 knots) in January, February, March, April, May, June, July, August, September, October, November and December. What does this mean?
The mean monthly wind speed over the year (meters per second)
Best Time to Visit Williamstown
The weather does bring rainfall during this period, between 40 mm (1.6 in) and 66 mm (2.6 in). Wondering where to travel based on your weather preferences? Our recommendation tool helps you find destinations with your ideal climate conditions. Use our weather planner to find your perfect destination.
Frequently asked questions about the climate in Williamstown
What is the best time to visit Williamstown?
January, February, March, April, November and December typically offer the most optimal weather in Williamstown. In contrast, May, June, July, August and September tend to have less optimal conditions.
What temperatures can I expect in Williamstown?
Daytime highs range from 14°C (57°F) in July to 25°C (77°F) in January. Nighttime lows range from 7°C (45°F) to 15°C (59°F). Temperatures vary considerably through the year.
How much rain does Williamstown get?
Annual rainfall is around 685 mm (27 in). September is the wettest month with 68 mm (2.7 in), while March is the driest with 40 mm (1.6 in).
How sunny is Williamstown?
Williamstown receives around 2,383 hours of sunshine per year. January is the sunniest month with 276 hours, while June is the cloudiest with just 123 hours. Overall, Williamstown enjoys abundant sunshine.
Williamstown 3-Day Forecast
Williamstown 3-Day Forecast
Williamstown on the map
Williamstown is highlighted — select any city to see its climate.
Popular this month
Where to go in July — average daytime high across popular destinations.
Bucket list
Need travel inspiration? Check out our bucket list articles and be inspired.
An alternative way to discover Sydney
We have made an overview of the sights in Sydney that you must see if you want to visit Sydney in an alternative way.
The most relaxed and alternative area of Australia is called the Byron Shire
The Byron Shire is one of the most pretty areas in the world. Not only in terms on natural beauty, also the relaxed vibe and people make this an area that remains close to your heart.
Sail the Whitsunday islands
The best travel period to sail the Whitsunday islands is “winter” between June and October, with pleasant temperatures around 23 degrees Celsius (74 Fahrenheit).
The best dive spots in Australia
Explore Australia's best dive spots: from the Great Barrier Reef to HMAS Perth. Discover vibrant corals, marine life, and historic wrecks.