S
M
T
W
T
F
S
30
98°
71°
31
99°
75°
1
99°
75°
2
100°
73°
3
97°
72°
4
99°
73°
5
100°
75°
6
100°
73°
7
97°
73°
8
99°
73°
9
99°
73°
10
77°
68°
11
90°
64°
12
88°
68°
13
91°
66°
14
95°
73°
15
97°
79°
16
97°
73°
17
95°
73°
18
94°
72°
19
96°
70°
20
93°
70°
21
85°
63°
22
82°
60°
23
84°
61°
24
82°
59°
25
78°
58°
26
79°
58°
27
80°
59°
28
81°
59°
29
76°
58°
30
75°
51°
1
80°
59°
2
76°
58°
3
76°
57°
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 75° to 96°, with overnight lows between 51° and 73°. The average high for September is 83° with an average low of 61°. 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.
