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7 Days
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Monthly
Precipitation
Temperature
Wind
Temperature Unit Selection
°Celsius
°Fahrenheit
Monthly Historical Averages
Chelmsford, MA
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May
Average Temperature
High
21°
Feels 21
Low
9°
Feels 8
Average Precipitation
10 Days
Rain amount
59mm
Snow amount
0cm
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
21
22
23
24
11°
25
21°
26
26°
27
28°
28
19°
29
18°
30
21°
31
23°
Forecast
Sunday, May 24, 2026
Day
11°
Feels 10
Wind
16 km/h E
Gust
24 km/h
Humidity
76%
P.O.P
90%
Rain
~15 mm
Night
11°
Feels 9
Wind
16 km/h E
Gust
24 km/h
Humidity
100%
P.O.P
90%
Rain
~15 mm
Historical Averages
May 24
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity
Historical Averages are based on data recorded from 2000 onwards.