S
M
T
W
T
F
S
30
78°
53°
31
83°
53°
1
86°
54°
2
85°
51°
3
81°
47°
4
76°
44°
5
76°
48°
6
79°
49°
7
82°
49°
8
83°
50°
9
83°
50°
10
84°
49°
11
84°
50°
12
82°
50°
13
81°
46°
14
78°
46°
15
79°
45°
16
79°
46°
17
78°
45°
18
75°
45°
19
74°
44°
20
Hist. Avg.
74°
41°
21
Hist. Avg.
73°
40°
22
Hist. Avg.
72°
40°
23
Hist. Avg.
72°
40°
24
Hist. Avg.
71°
39°
25
Hist. Avg.
71°
39°
26
Hist. Avg.
70°
38°
27
Hist. Avg.
70°
38°
28
Hist. Avg.
69°
38°
29
Hist. Avg.
68°
37°
30
Hist. Avg.
68°
37°
1
Hist. Avg.
67°
36°
2
Hist. Avg.
67°
36°
3
Hist. Avg.
66°
36°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Casper South
Casper South's September 2026 forecast shows daily high temperatures ranging from 74° to 86°, with overnight lows between 44° and 54°. The average high for September is 80° with an average low of 48°. 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 Casper South. See also: October | November | December.
