S
M
T
W
T
F
S
30
77°
54°
31
80°
54°
1
79°
45°
2
75°
46°
3
70°
51°
4
73°
53°
5
74°
54°
6
76°
46°
7
75°
44°
8
70°
45°
9
71°
52°
10
68°
52°
11
75°
51°
12
69°
45°
13
67°
48°
14
65°
47°
15
66°
43°
16
65°
42°
17
66°
48°
18
66°
42°
19
65°
46°
20
66°
50°
21
69°
47°
22
68°
40°
23
65°
40°
24
64°
47°
25
64°
41°
26
62°
42°
27
66°
46°
28
Hist. Avg.
61°
44°
29
Hist. Avg.
60°
44°
30
Hist. Avg.
60°
43°
1
Hist. Avg.
59°
43°
2
Hist. Avg.
59°
42°
3
Hist. Avg.
59°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Cambridge
Cambridge's September 2026 forecast shows daily high temperatures ranging from 62° to 80°, with overnight lows between 40° and 54°. The average high for September is 70° with an average low of 47°. 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.
