Williamstown monthly weather averages

Average daytime temperature

The bar chart below shows the average monthly peak daytime temperatures at Williamstown

Williamstown average temperature chart (Celsius) Williamstown average temperature chart (Fahrenheit)
Average monthly temperatures in Williamstown (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 27.7 28 24.6 21 16.6 13.8 12.8 13.9 16 19.5 22.7 25.3
°F 81.8 82.4 76.3 69.8 61.9 56.8 55.1 57 60.8 67.1 72.8 77.6

Please note: these are the average peak daytime temperatures (usually around mid-afternoon) so do not show daytime / night highs and lows. To see the daily range of temperatures have a look at the temperature max / min chart below.

Average rainfall & rainy days

The graph below shows the average rainfall and number of rainy days per month.

Williamstown monthly rainfall chart (mm) Williamstown monthly rainfall chart (inches)
Average monthly rainfall in Williamstown (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 20 21 25 53 84 84 99 94 75 59 35 29
inches 0.8 0.8 1 2.1 3.3 3.3 3.9 3.7 3 2.3 1.4 1.1
Rainy days 7 7 6 6 8 8 10 9 9 10 7 7

Average annual rainfall in Williamstown: 780.367mm (307.2 inches)

Average daily sunshine

The bar chart below shows the average daily sunshine hours in Williamstown

Williamstown average daily sunshine chart
Average daily sunshine Williamstown
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 10.6 10 8.8 7.3 5.5 4.9 4.9 5.8 6.8 8.2 9.2 9.7

Day / night temperatures

The graph below shows the daily range of temperatures for each month.

Williamstown average minimum / maximum temperatures (Celsius) Williamstown average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Williamstown (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C 12.4 12.7 10.9 8.3 6 4.2 4 4.3 5.4 6.8 8.8 10.7
Max °C 28.1 28.4 25 21.3 16.9 14 13.1 14.2 16.3 19.8 23 25.7
Min °F 54.2 54.8 51.5 46.9 42.7 39.6 39.1 39.7 41.6 44.2 47.8 51.3
Max °F 68.4 68.9 64.2 58.6 52.5 48.4 47.3 48.6 51.4 55.9 60.6 64.8

Sea temperature

The graph below shows the average sea temperature.

Williamstown average sea temperature chart (Celsius) Williamstown average sea temperature chart (Fahrenheit)
Average sea temperature around Williamstown in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 20.2 20.7 20.1 18.9 17.6 16.2 14.8 14.1 14.4 15.5 17 18.7
°F 68.3 69.2 68.2 66.1 63.8 61.1 58.7 57.3 57.9 59.8 62.7 65.7

Wind speed

The graph below shows the average wind speed.

Williamstown average winspeed by month (km/h) Williamstown average winspeed by month (mph)
Average wind speed in Williamstown (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 13 12 12 11 10 10 12 13 14 14 13 13
mph 8 7 7 7 7 6 7 8 9 9 8 8

A monthly average windspeed of over 16km/h or 10mph suggests a location is fairly windy.

Relative humidity

The graph below shows the average relative humidity.

Williamstown relative humidity averages
Average relative humidity in Williamstown
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
41% 43% 47% 54% 67% 74% 74% 69% 61% 52% 45% 43%

Other monthly averages

UV index Best time to go?

Williamstown weather stats

Williamstown weather statistics
Hottest month: February 28°C 82.4°F
Driest month: January 20mm 0.8ins
Sunniest month: February 10hrs
Coldest month: July 12.8°C 55°F
Wettest month: July 99mm 3.9ins
Warmest sea: February 20.7°C 69.3°F
Map showing location of Williamstown (-34.6721, 138.89108) Williamstown map pin © Google

Locations nearby

Top Australia locations