S
M
T
W
T
F
S
30
80°
71°
31
91°
74°
1
95°
74°
2
95°
70°
3
95°
75°
4
96°
75°
5
93°
73°
6
84°
63°
7
83°
58°
8
88°
69°
9
78°
63°
10
80°
56°
11
82°
64°
12
82°
59°
13
75°
64°
14
77°
60°
15
74°
54°
16
73°
53°
17
74°
54°
18
69°
51°
19
72°
49°
20
72°
52°
21
74°
51°
22
73°
56°
23
75°
56°
24
78°
57°
25
78°
58°
26
77°
57°
27
78°
58°
28
78°
58°
29
77°
57°
30
75°
56°
1
73°
51°
2
64°
45°
3
63°
42°
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 88°, with overnight lows between 42° and 69°. The average high for September is 75° with an average low of 56°. 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.
