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
N/A
6
59°
53°
7
67°
54°
8
62°
48°
9
62°
57°
10
71°
56°
11
62°
50°
12
64°
50°
13
67°
56°
14
68°
52°
15
64°
52°
16
67°
51°
17
66°
51°
18
65°
53°
19
68°
52°
20
64°
51°
21
60°
51°
22
60°
51°
23
62°
50°
24
64°
50°
25
60°
49°
26
65°
49°
27
57°
48°
28
59°
49°
29
65°
49°
30
65°
48°
1
64°
49°
2
64°
48°
3
62°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Summerside
Summerside's September 2026 forecast shows daily high temperatures ranging from 57° to 71°, with overnight lows between 48° and 57°. The average high for September is 64° with an average low of 51°. 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.
