S
M
T
W
T
F
S
30
92°
70°
31
91°
69°
1
92°
69°
2
90°
68°
3
87°
67°
4
88°
66°
5
85°
67°
6
86°
67°
7
85°
66°
8
88°
67°
9
90°
67°
10
87°
66°
11
85°
63°
12
88°
66°
13
90°
66°
14
89°
59°
15
84°
59°
16
82°
60°
17
83°
59°
18
85°
60°
19
88°
63°
20
88°
63°
21
87°
62°
22
83°
63°
23
86°
63°
24
83°
60°
25
84°
59°
26
86°
58°
27
86°
61°
28
85°
60°
29
86°
61°
30
86°
60°
1
85°
59°
2
86°
59°
3
85°
55°
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 82° to 92°, with overnight lows between 55° and 70°. The average high for September is 87° with an average low of 63°. 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.
