S
M
T
W
T
F
S
30
68°
48°
31
63°
48°
1
70°
47°
2
71°
48°
3
71°
42°
4
68°
39°
5
60°
39°
6
60°
40°
7
61°
37°
8
59°
35°
9
58°
37°
10
57°
38°
11
58°
44°
12
59°
45°
13
62°
42°
14
60°
45°
15
58°
41°
16
63°
36°
17
59°
35°
18
56°
43°
19
60°
42°
20
64°
41°
21
57°
36°
22
55°
33°
23
55°
33°
24
54°
34°
25
55°
33°
26
55°
33°
27
54°
39°
28
55°
40°
29
56°
35°
30
53°
40°
1
57°
39°
2
56°
38°
3
54°
38°
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 53° to 71°, with overnight lows between 33° and 48°. The average high for September is 59° with an average low of 40°. 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.
