S
M
T
W
T
F
S
30
81°
62°
31
83°
60°
1
83°
54°
2
80°
56°
3
81°
55°
4
74°
56°
5
78°
55°
6
81°
58°
7
79°
51°
8
74°
48°
9
74°
55°
10
73°
58°
11
80°
55°
12
79°
58°
13
79°
55°
14
80°
56°
15
79°
58°
16
Hist. Avg.
73°
50°
17
Hist. Avg.
73°
50°
18
Hist. Avg.
72°
49°
19
Hist. Avg.
72°
49°
20
Hist. Avg.
71°
48°
21
Hist. Avg.
71°
48°
22
Hist. Avg.
71°
48°
23
Hist. Avg.
70°
47°
24
Hist. Avg.
70°
46°
25
Hist. Avg.
69°
46°
26
Hist. Avg.
69°
46°
27
Hist. Avg.
69°
45°
28
Hist. Avg.
68°
45°
29
Hist. Avg.
68°
44°
30
Hist. Avg.
67°
44°
1
Hist. Avg.
67°
44°
2
Hist. Avg.
66°
43°
3
Hist. Avg.
66°
43°
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 73° to 83°, with overnight lows between 48° and 62°. 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 Sumner. See also: October | November | December.
