S
M
T
W
T
F
S
30
83°
67°
31
86°
67°
1
88°
67°
2
87°
70°
3
82°
70°
4
86°
68°
5
79°
62°
6
80°
58°
7
80°
59°
8
82°
69°
9
81°
55°
10
75°
53°
11
78°
62°
12
79°
58°
13
76°
59°
14
76°
57°
15
71°
52°
16
68°
51°
17
71°
55°
18
70°
53°
19
69°
51°
20
72°
49°
21
70°
54°
22
69°
54°
23
71°
53°
24
74°
54°
25
75°
54°
26
74°
53°
27
73°
54°
28
75°
55°
29
75°
54°
30
73°
54°
1
70°
48°
2
63°
44°
3
60°
40°
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 60° to 82°, with overnight lows between 40° 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.
