S
M
T
W
T
F
S
30
73°
51°
31
77°
47°
1
71°
59°
2
69°
54°
3
67°
53°
4
66°
50°
5
69°
51°
6
70°
51°
7
68°
52°
8
69°
49°
9
67°
50°
10
69°
51°
11
70°
52°
12
69°
52°
13
68°
51°
14
69°
49°
15
71°
50°
16
65°
49°
17
64°
50°
18
64°
45°
19
63°
50°
20
63°
46°
21
64°
43°
22
63°
44°
23
62°
43°
24
61°
42°
25
62°
42°
26
66°
44°
27
68°
50°
28
62°
49°
29
61°
43°
30
69°
47°
1
66°
49°
2
61°
49°
3
62°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Sunday Lake
Sunday Lake's September 2026 forecast shows daily high temperatures ranging from 61° to 71°, with overnight lows between 42° and 59°. The average high for September is 66° with an average low of 49°. 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 Sunday Lake. See also: October | November | December.
