S
M
T
W
T
F
S
30
89°
60°
31
83°
59°
1
81°
62°
2
81°
63°
3
85°
59°
4
86°
65°
5
87°
65°
6
88°
58°
7
86°
58°
8
80°
57°
9
80°
57°
10
81°
62°
11
85°
57°
12
84°
58°
13
77°
56°
14
78°
62°
15
82°
63°
16
85°
55°
17
84°
54°
18
76°
53°
19
75°
54°
20
76°
59°
21
75°
57°
22
76°
53°
23
75°
57°
24
75°
55°
25
76°
58°
26
78°
58°
27
80°
53°
28
80°
51°
29
73°
56°
30
74°
56°
1
73°
57°
2
77°
55°
3
78°
49°
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 73° to 89°, with overnight lows between 49° and 65°. The average high for September is 80° with an average low of 57°. 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.
