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Williamstown climate
Typical historical weather for Williamstown, United States, averaged across 10 years of hourly climate data. Pick a date for a specific day.
Want today's actual conditions instead? See the current forecast for Williamstown.
Annual average
14.2°C
across all months
Warmest month
30.6°C
Jul average high
Coolest month
-1.6°C
Jan average low
Annual rainfall
1181mm
total per year
Monthly averages
Average daily high/low temperature (band) and monthly rainfall (bars).
● Avg high● Avg low▮ Rainfall
Records on file
Hottest day
38.8°C
24 June 2025
Coldest day
-17.1°C
7 January 2018
Wettest day
60.5mm
29 October 2017
Windiest day
9m/s
23 January 2016
See the detail: Williamstown on 29 October 2017.