S
M
T
W
T
F
S
30
67°
44°
31
71°
42°
1
76°
44°
2
78°
51°
3
63°
52°
4
60°
40°
5
61°
35°
6
69°
37°
7
74°
38°
8
77°
46°
9
72°
48°
10
57°
47°
11
54°
35°
12
59°
33°
13
64°
45°
14
56°
35°
15
64°
40°
16
72°
46°
17
70°
42°
18
70°
44°
19
74°
48°
20
71°
45°
21
66°
42°
22
65°
41°
23
63°
44°
24
67°
45°
25
52°
37°
26
51°
36°
27
52°
31°
28
52°
40°
29
53°
36°
30
50°
37°
1
51°
30°
2
48°
30°
3
47°
28°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Grande Prairie
Grande Prairie's September 2026 forecast shows daily high temperatures ranging from 47° to 74°, with overnight lows between 28° and 48°. The average high for September is 60° with an average low of 39°. 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 Grande Prairie. See also: October | November | December.
