S
M
T
W
T
F
S
30
90°
70°
31
91°
70°
1
90°
71°
2
91°
71°
3
91°
70°
4
90°
69°
5
90°
69°
6
89°
68°
7
90°
69°
8
91°
69°
9
91°
68°
10
90°
69°
11
91°
69°
12
90°
68°
13
90°
69°
14
88°
66°
15
90°
66°
16
88°
64°
17
89°
65°
18
88°
64°
19
89°
65°
20
89°
64°
21
88°
62°
22
87°
64°
23
86°
63°
24
83°
62°
25
80°
62°
26
83°
61°
27
85°
61°
28
84°
60°
29
84°
61°
30
83°
60°
1
84°
55°
2
81°
50°
3
75°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Jasper
Jasper's September 2026 forecast shows daily high temperatures ranging from 75° to 91°, with overnight lows between 49° and 71°. The average high for September is 87° with an average low of 65°. 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 Jasper. See also: October | November | December.
