Williamstown Temperature by Month
Williamstown, South Australia, Australia has an average annual maximum temperature of 22°C (72°F), ranging from 15°C (59°F) in August to 29°C (84°F) in January. Below you'll find a full monthly breakdown and a comparison with cities worldwide.
Williamstown Monthly Temperatures
Visitors to Williamstown will encounter a climate influenced by big temperature differences across the year. Nighttime temperatures range from 14°C (57°F) in January to 6°C (43°F) in August.
The chart below illustrates the average maximum day and minimum night temperatures in Williamstown by month:
The minimum temperature is often recorded between 4 AM and 6 AM, while the highest temperature is usually reached at 3 PM, when the sun's heating effect is strongest. January, the warmest month, gets 326 hours of sunshine.
The chart below shows the average temperature throughout the year:
Temperature: Williamstown vs Australia
The map below shows the annual temperature across Australia. You can also select individual months if you want to compare a specific time of year.
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Williamstown vs World: Temperature Compared
Williamstown's average annual maximum temperature is 22°C (72°F). To put that in context, here's how it compares to a few well-known destinations:
Athens, Greece sits at 23°C (73°F) on average, with hot dry summers and mild winters characteristic of the Mediterranean.
Glasgow, Scotland averages 13°C (55°F) a year — mild but often grey, with cold winters and rarely hot summers.
New York City, USA averages 17°C (63°F) a year, with hot humid summers and cold winters that bring regular snowfall.
Adelaide, Australia averages 21°C (70°F) a year, with warm summers, mild winters, and relatively low rainfall year-round.
What Does the Temperature Feel Like in Williamstown?
Temperature alone doesn't tell the whole story — humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.
In Williamstown, August is the coolest month, with average highs of 16°C (61°F) and humidity around 55% — considered moderate. In January, the warmest month, temperatures average 29°C (84°F) with 36% humidity — conditions that feel low. For a full picture, see our humidity page.
Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.
The readings come from a range of sources — land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.
Global average temperatures have risen by around 1.2°C since the pre-industrial era, and the effects are visible across many regions. Winters are milder on average, with fewer frost days and less snow in many parts of the world. Heatwaves are more frequent and more intense, and Europe's summers of 2018, 2019, and 2020 all set records.
Summers are also getting drier in some areas, while winter rainfall has increased in others. This contributies to higher river levels and more flooding. In many countries, spring arrives earlier and autumn lasts longer. It has knock-on effects for wildlife, agriculture, and local ecosystems.
For more on Williamstown's weather — including monthly rainfall, sunshine hours, and humidity — visit our Williamstown climate page.
