S
M
T
W
T
F
S
30
77°
56°
31
78°
56°
1
75°
55°
2
74°
57°
3
75°
58°
4
74°
58°
5
75°
57°
6
76°
56°
7
74°
55°
8
75°
54°
9
73°
54°
10
73°
60°
11
74°
54°
12
76°
53°
13
77°
52°
14
75°
58°
15
76°
57°
16
73°
52°
17
70°
51°
18
72°
51°
19
71°
57°
20
73°
57°
21
76°
56°
22
72°
55°
23
74°
55°
24
75°
52°
25
73°
54°
26
67°
47°
27
73°
47°
28
66°
46°
29
65°
47°
30
68°
49°
1
68°
46°
2
Hist. Avg.
67°
52°
3
Hist. Avg.
67°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Old Cambridge
Old Cambridge's September 2026 forecast shows daily high temperatures ranging from 65° to 78°, with overnight lows between 46° and 60°. 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 Old Cambridge. See also: October | November | December.
