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Precipitation
Temperature
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Temperature Unit Selection
°Celsius
°Fahrenheit
Monthly Historical Averages
Chatham, MA
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September
Average Temperature
High
21°
Feels 21
Low
15°
Feels 15
Average Precipitation
8 Days
Rain amount
70.8mm
Snow amount
0cm
Content continues below
Daily Historical Averages
September 2026
S
M
T
W
T
F
S
1
21°
2
21°
3
23°
4
22°
5
20°
6
18°
7
21°
8
20°
9
20°
10
21°
11
20°
12
20°
13
19°
14
20°
15
19°
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Forecast
Tuesday, September 1, 2026
Day
21°
Feels 21
Wind
27 km/h SE
Gust
41 km/h
Humidity
69%
P.O.P
90%
Rain
5-10 mm
Night
18°
Feels 18
Wind
31 km/h E
Gust
47 km/h
Humidity
78%
P.O.P
70%
Rain
1-3 mm
Historical Averages
Sep 1
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity
Historical Averages are based on data recorded from 2000 onwards.