S
M
T
W
T
F
S
30
90°
71°
31
89°
68°
1
93°
69°
2
95°
73°
3
95°
73°
4
95°
73°
5
96°
70°
6
95°
69°
7
91°
69°
8
91°
67°
9
90°
66°
10
86°
57°
11
86°
57°
12
84°
58°
13
84°
59°
14
81°
61°
15
86°
60°
16
86°
62°
17
85°
63°
18
86°
62°
19
85°
60°
20
84°
61°
21
85°
61°
22
85°
60°
23
84°
61°
24
83°
60°
25
82°
60°
26
83°
59°
27
82°
58°
28
82°
58°
29
81°
57°
30
82°
58°
1
81°
58°
2
81°
57°
3
80°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Grand Island
Grand Island's September 2026 forecast shows daily high temperatures ranging from 80° to 96°, with overnight lows between 56° and 73°. The average high for September is 86° with an average low of 62°. 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 Grand Island. See also: October | November | December.
