S
M
T
W
T
F
S
30
82°
68°
31
90°
72°
1
89°
68°
2
88°
66°
3
85°
66°
4
84°
65°
5
85°
63°
6
79°
61°
7
74°
60°
8
77°
59°
9
76°
57°
10
76°
54°
11
73°
53°
12
73°
55°
13
72°
56°
14
73°
51°
15
78°
57°
16
78°
55°
17
76°
55°
18
77°
57°
19
76°
56°
20
77°
54°
21
77°
56°
22
76°
56°
23
77°
55°
24
77°
55°
25
76°
54°
26
75°
54°
27
76°
53°
28
76°
53°
29
75°
52°
30
74°
52°
1
74°
51°
2
73°
52°
3
74°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Rock Springs
Rock Springs's September 2026 forecast shows daily high temperatures ranging from 72° to 89°, with overnight lows between 50° and 68°. The average high for September is 77° with an average low of 56°. 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 Rock Springs. See also: October | November | December.
