S
M
T
W
T
F
S
30
86°
65°
31
91°
73°
1
93°
74°
2
96°
73°
3
93°
71°
4
89°
69°
5
81°
59°
6
81°
59°
7
83°
63°
8
87°
69°
9
88°
67°
10
85°
64°
11
81°
59°
12
81°
62°
13
80°
61°
14
76°
59°
15
80°
56°
16
82°
62°
17
82°
61°
18
78°
61°
19
83°
61°
20
78°
60°
21
79°
61°
22
80°
59°
23
77°
55°
24
73°
57°
25
79°
59°
26
77°
56°
27
70°
50°
28
69°
47°
29
68°
48°
30
68°
47°
1
67°
46°
2
69°
55°
3
73°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Westerville
Westerville's September 2026 forecast shows daily high temperatures ranging from 67° to 96°, with overnight lows between 46° and 73°. The average high for September is 79° with an average low of 59°. 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 Westerville. See also: October | November | December.
