S
M
T
W
T
F
S
30
77°
66°
31
86°
70°
1
88°
68°
2
82°
68°
3
86°
70°
4
90°
72°
5
81°
68°
6
77°
66°
7
77°
63°
8
75°
64°
9
82°
63°
10
79°
54°
11
79°
55°
12
77°
55°
13
64°
50°
14
66°
50°
15
70°
57°
16
72°
54°
17
72°
64°
18
75°
61°
19
73°
59°
20
66°
57°
21
57°
54°
22
61°
50°
23
68°
46°
24
66°
48°
25
68°
57°
26
68°
55°
27
61°
54°
28
72°
57°
29
73°
52°
30
68°
64°
1
68°
46°
2
66°
43°
3
70°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Sumner
Sumner's September 2026 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. 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 Sumner. See also: October | November | December.
