S
M
T
W
T
F
S
30
78°
63°
31
82°
63°
1
83°
64°
2
84°
63°
3
83°
56°
4
82°
54°
5
75°
56°
6
75°
61°
7
77°
61°
8
80°
60°
9
80°
61°
10
80°
59°
11
79°
57°
12
79°
55°
13
78°
60°
14
79°
60°
15
79°
59°
16
80°
54°
17
78°
59°
18
75°
57°
19
77°
54°
20
73°
50°
21
70°
48°
22
69°
54°
23
69°
52°
24
75°
48°
25
68°
47°
26
67°
47°
27
68°
52°
28
72°
53°
29
74°
49°
30
72°
48°
1
66°
51°
2
66°
44°
3
65°
46°
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 84°, with overnight lows between 44° and 64°. The average high for September is 75° with an average low of 55°. 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.
