S
M
T
W
T
F
S
30
79°
63°
31
81°
63°
1
80°
64°
2
79°
64°
3
78°
63°
4
83°
66°
5
81°
61°
6
76°
60°
7
77°
61°
8
77°
60°
9
80°
64°
10
81°
59°
11
76°
63°
12
76°
63°
13
77°
62°
14
80°
64°
15
83°
65°
16
82°
63°
17
79°
64°
18
82°
64°
19
81°
63°
20
82°
64°
21
81°
64°
22
79°
63°
23
76°
62°
24
74°
62°
25
73°
61°
26
79°
62°
27
80°
53°
28
70°
51°
29
69°
51°
30
70°
59°
1
78°
56°
2
71°
49°
3
73°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Alumni Stadium (Dover, DE)
Alumni Stadium (Dover, DE)'s September 2026 forecast shows daily high temperatures ranging from 69° to 83°, with overnight lows between 46° and 66°. The average high for September is 78° 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 Alumni Stadium (Dover, DE). See also: October | November | December.