S
M
T
W
T
F
S
30
78°
64°
31
87°
61°
1
82°
55°
2
82°
62°
3
83°
67°
4
86°
60°
5
83°
68°
6
82°
67°
7
78°
69°
8
84°
60°
9
75°
55°
10
72°
59°
11
82°
61°
12
75°
61°
13
77°
57°
14
78°
59°
15
79°
58°
16
72°
50°
17
74°
56°
18
75°
54°
19
75°
55°
20
74°
54°
21
72°
54°
22
72°
52°
23
73°
54°
24
74°
53°
25
73°
49°
26
63°
44°
27
61°
41°
28
59°
40°
29
68°
41°
30
58°
39°
1
59°
46°
2
58°
46°
3
59°
42°
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 86°, with overnight lows between 39° and 69°. 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.
