S
M
T
W
T
F
S
30
86°
65°
31
73°
63°
1
69°
63°
2
72°
64°
3
73°
63°
4
85°
66°
5
73°
64°
6
68°
59°
7
82°
59°
8
81°
64°
9
76°
61°
10
87°
71°
11
79°
63°
12
71°
56°
13
70°
63°
14
75°
49°
15
68°
53°
16
79°
62°
17
79°
66°
18
77°
55°
19
70°
59°
20
74°
55°
21
65°
56°
22
71°
53°
23
68°
53°
24
69°
52°
25
71°
51°
26
70°
53°
27
65°
54°
28
74°
55°
29
73°
54°
30
65°
51°
1
64°
52°
2
64°
53°
3
72°
52°
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 64° to 79°, with overnight lows between 49° and 66°. The average high for September is 71° 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.
