S
M
T
W
T
F
S
30
74°
53°
31
69°
50°
1
68°
50°
2
68°
49°
3
69°
54°
4
71°
56°
5
76°
57°
6
75°
57°
7
73°
53°
8
75°
52°
9
70°
55°
10
76°
49°
11
77°
51°
12
71°
55°
13
75°
52°
14
75°
43°
15
71°
40°
16
62°
41°
17
63°
43°
18
64°
50°
19
66°
52°
20
67°
52°
21
68°
51°
22
71°
51°
23
70°
50°
24
71°
52°
25
73°
51°
26
72°
52°
27
71°
38°
28
71°
36°
29
59°
40°
30
58°
38°
1
57°
39°
2
58°
41°
3
58°
37°
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 57° to 77°, with overnight lows between 36° and 57°. The average high for September is 69° with an average low of 48°. 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.
