S
M
T
W
T
F
S
30
71°
48°
31
69°
46°
1
71°
46°
2
71°
48°
3
72°
51°
4
73°
51°
5
70°
54°
6
76°
52°
7
75°
50°
8
71°
44°
9
69°
45°
10
68°
48°
11
69°
49°
12
71°
50°
13
70°
47°
14
69°
47°
15
72°
50°
16
70°
49°
17
72°
50°
18
69°
49°
19
70°
49°
20
71°
48°
21
71°
47°
22
72°
41°
23
66°
45°
24
62°
45°
25
62°
42°
26
61°
39°
27
61°
40°
28
60°
39°
29
61°
41°
30
60°
38°
1
59°
38°
2
59°
37°
3
60°
40°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Cambridge
Cambridge's September 2026 forecast shows daily high temperatures ranging from 59° to 76°, with overnight lows between 37° and 54°. The average high for September is 68° with an average low of 46°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Cambridge. See also: October | November | December.
