S
M
T
W
T
F
S
30
76°
59°
31
78°
64°
1
80°
65°
2
80°
65°
3
79°
63°
4
75°
61°
5
74°
60°
6
74°
59°
7
75°
62°
8
78°
59°
9
73°
57°
10
73°
57°
11
79°
51°
12
70°
51°
13
72°
53°
14
71°
52°
15
70°
51°
16
71°
52°
17
70°
50°
18
73°
55°
19
70°
51°
20
71°
49°
21
68°
48°
22
68°
52°
23
72°
51°
24
75°
49°
25
74°
54°
26
74°
54°
27
73°
52°
28
66°
50°
29
73°
52°
30
73°
45°
1
66°
52°
2
71°
54°
3
72°
44°
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 66° to 80°, with overnight lows between 44° and 65°. The average high for September is 73° with an average low of 54°. 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.
