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7 Days
14 Days
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Monthly
Precipitation
Temperature
Wind
Temperature Unit Selection
°Celsius
°Fahrenheit
Monthly Historical Averages
Williamstown, MA
Content continues below
May
Average Temperature
High
21°
Feels 21
Low
7°
Feels 6
Average Precipitation
12 Days
Rain amount
75.5mm
Snow amount
0.1cm
Content continues below
Daily Historical Averages
May 2026
S
M
T
W
T
F
S
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
26°
21
17°
22
17°
23
12°
24
10°
25
15°
26
19°
27
20°
28
19°
29
20°
30
20°
31
19°
Forecast
Wednesday, May 20, 2026
Day
26°
Feels 26
Wind
24 km/h W
Gust
36 km/h
Humidity
53%
P.O.P
40%
Rain
~1 mm
Night
10°
Feels 8
Wind
20 km/h W
Gust
30 km/h
Humidity
71%
P.O.P
30%
Historical Averages
May 20
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity
Historical Averages are based on data recorded from 2000 onwards.