S
M
T
W
T
F
S
30
90°
67°
31
89°
67°
1
88°
66°
2
89°
67°
3
89°
67°
4
88°
66°
5
88°
67°
6
87°
66°
7
88°
65°
8
87°
65°
9
88°
64°
10
87°
65°
11
87°
66°
12
86°
66°
13
87°
64°
14
82°
61°
15
75°
63°
16
86°
62°
17
87°
58°
18
85°
51°
19
73°
49°
20
76°
50°
21
78°
54°
22
81°
57°
23
82°
58°
24
83°
57°
25
81°
58°
26
80°
57°
27
82°
52°
28
77°
47°
29
70°
50°
30
75°
54°
1
78°
55°
2
80°
55°
3
81°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Exeter
Exeter's September 2026 forecast shows daily high temperatures ranging from 70° to 90°, with overnight lows between 47° and 67°. The average high for September is 83° with an average low of 60°. 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 Exeter. See also: October | November | December.
