S
M
T
W
T
F
S
30
97°
64°
31
100°
70°
1
103°
71°
2
102°
72°
3
102°
73°
4
103°
73°
5
103°
75°
6
90°
67°
7
N/A
8
94°
73°
9
98°
71°
10
80°
61°
11
85°
65°
12
85°
66°
13
92°
66°
14
90°
66°
15
82°
58°
16
76°
56°
17
77°
56°
18
76°
55°
19
75°
52°
20
78°
55°
21
79°
54°
22
76°
59°
23
77°
58°
24
82°
59°
25
83°
60°
26
83°
59°
27
82°
60°
28
82°
59°
29
81°
60°
30
82°
60°
1
77°
55°
2
77°
49°
3
68°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Sumner
Sumner's September 2026 forecast shows daily high temperatures ranging from 68° to 98°, with overnight lows between 45° and 73°. The average high for September is 81° 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 Sumner. See also: October | November | December.
