S
M
T
W
T
F
S
30
78°
60°
31
80°
65°
1
82°
65°
2
80°
64°
3
83°
63°
4
80°
55°
5
78°
56°
6
78°
56°
7
79°
57°
8
84°
59°
9
84°
62°
10
85°
56°
11
77°
54°
12
77°
57°
13
78°
54°
14
79°
53°
15
73°
57°
16
74°
56°
17
73°
54°
18
75°
52°
19
79°
51°
20
74°
57°
21
78°
51°
22
75°
58°
23
79°
56°
24
81°
57°
25
81°
57°
26
79°
56°
27
78°
57°
28
80°
56°
29
79°
51°
30
74°
54°
1
77°
56°
2
79°
50°
3
79°
46°
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 73° to 85°, with overnight lows between 46° and 65°. The average high for September is 79° 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 Westerville. See also: October | November | December.
