Warm
Average highs sit around 27°C, giving warm days by monthly-average standards.
Weather Guide
Williamstown, Massachusetts, United States Average Monthly Weather
Weather score40Poor annual avg
Best months: July, August, June
Across the year, average daytime temperatures are around 13°C, sunshine averages 6.4h per day, and rainfall totals about 1132mm.
Annual weather
Annual averages
Temp
13°C
Rain
1132mm
Annual total
Sun
6.4h
Weather score
40
Poor avg
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 96mm, so some wet days are possible.
Bright
Sunshine averages 9h per day, so bright days are a strong part of the month.
Map
Weather map
Compare Williamstown, Massachusetts, United States with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
July27°C average high
July is one of Williamstown's warmest months, with daytime heat above the yearly average.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
July96mm average rain
July sits near Williamstown's yearly rainfall average, so rain is a normal planning factor rather than an outlier.
Driest monthsJanuary to July and September to December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
July9 hours average sun
July is one of Williamstown's sunniest months, with some of the strongest bright-day conditions in the yearly averages.
Brightest monthsMay to August
This stretch has the strongest sunshine in the monthly averages.
Weather score
July69 weather score
July is one of Williamstown's best weather-score months, combining the strongest overall balance in the yearly averages.
Best weather monthsJune to August
These months have the strongest weather score in the monthly averages.
