S
M
T
W
T
F
S
30
64°
51°
31
65°
50°
1
64°
53°
2
63°
52°
3
63°
50°
4
64°
49°
5
63°
51°
6
64°
50°
7
66°
52°
8
65°
54°
9
66°
53°
10
62°
54°
11
64°
54°
12
63°
53°
13
66°
54°
14
66°
53°
15
65°
52°
16
63°
50°
17
60°
51°
18
60°
48°
19
61°
47°
20
61°
47°
21
60°
46°
22
60°
48°
23
61°
47°
24
60°
49°
25
59°
51°
26
59°
51°
27
62°
49°
28
61°
47°
29
59°
47°
30
58°
46°
1
58°
45°
2
59°
46°
3
59°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Sunniside
Sunniside's September 2026 forecast shows daily high temperatures ranging from 58° to 66°, with overnight lows between 45° and 54°. The average high for September is 62° with an average low of 50°. 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 Sunniside. See also: October | November | December.
