S
M
T
W
T
F
S
30
75°
52°
31
76°
51°
1
74°
51°
2
74°
53°
3
75°
54°
4
72°
54°
5
73°
53°
6
74°
52°
7
72°
51°
8
73°
50°
9
71°
50°
10
72°
56°
11
71°
50°
12
72°
49°
13
75°
48°
14
73°
54°
15
73°
54°
16
71°
49°
17
69°
47°
18
70°
47°
19
70°
51°
20
72°
53°
21
73°
52°
22
69°
50°
23
73°
51°
24
72°
49°
25
71°
50°
26
66°
43°
27
71°
44°
28
64°
43°
29
63°
43°
30
65°
44°
1
65°
42°
2
Hist. Avg.
64°
47°
3
Hist. Avg.
64°
47°
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 63° to 76°, with overnight lows between 42° and 56°. The average high for September is 71° with an average low of 50°. 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.
