S
M
T
W
T
F
S
30
75°
58°
31
68°
54°
1
68°
50°
2
68°
49°
3
72°
55°
4
65°
59°
5
59°
55°
6
57°
53°
7
59°
51°
8
58°
50°
9
61°
48°
10
74°
56°
11
61°
51°
12
65°
49°
13
69°
54°
14
74°
52°
15
64°
49°
16
70°
48°
17
66°
55°
18
67°
51°
19
59°
47°
20
57°
37°
21
64°
45°
22
59°
41°
23
60°
42°
24
68°
43°
25
66°
42°
26
66°
52°
27
62°
51°
28
62°
51°
29
60°
53°
30
61°
52°
1
68°
51°
2
66°
51°
3
62°
39°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Summerside
Summerside'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 Summerside. See also: October | November | December.
