S
M
T
W
T
F
S
30
68°
63°
31
75°
64°
1
86°
67°
2
84°
65°
3
81°
62°
4
72°
58°
5
76°
56°
6
75°
54°
7
76°
50°
8
77°
51°
9
74°
63°
10
76°
50°
11
72°
46°
12
79°
48°
13
79°
53°
14
67°
45°
15
72°
45°
16
81°
58°
17
75°
51°
18
71°
47°
19
61°
54°
20
65°
46°
21
61°
49°
22
62°
52°
23
64°
51°
24
65°
50°
25
68°
49°
26
69°
52°
27
69°
50°
28
70°
49°
29
66°
43°
30
63°
49°
1
65°
49°
2
60°
47°
3
58°
48°
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 58° to 81°, with overnight lows between 43° and 58°. The average high for September is 66° with an average low of 50°. 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.
