S
M
T
W
T
F
S
30
73°
53°
31
75°
50°
1
75°
53°
2
78°
53°
3
79°
51°
4
72°
48°
5
72°
46°
6
71°
48°
7
74°
50°
8
76°
45°
9
70°
50°
10
71°
47°
11
68°
46°
12
69°
49°
13
74°
47°
14
72°
41°
15
67°
40°
16
66°
43°
17
67°
42°
18
66°
39°
19
64°
38°
20
63°
38°
21
64°
39°
22
64°
43°
23
69°
46°
24
71°
45°
25
70°
40°
26
69°
42°
27
66°
36°
28
69°
34°
29
59°
35°
30
59°
43°
1
60°
44°
2
67°
45°
3
68°
33°
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 59° to 79°, with overnight lows between 33° and 53°. The average high for September is 69° with an average low of 44°. 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.
