S
M
T
W
T
F
S
30
75°
50°
31
74°
50°
1
73°
52°
2
72°
51°
3
74°
51°
4
73°
50°
5
72°
51°
6
72°
51°
7
70°
52°
8
72°
52°
9
72°
50°
10
73°
49°
11
71°
49°
12
70°
50°
13
71°
52°
14
72°
54°
15
76°
53°
16
77°
54°
17
76°
55°
18
76°
54°
19
68°
46°
20
74°
51°
21
68°
51°
22
Hist. Avg.
70°
48°
23
Hist. Avg.
70°
48°
24
Hist. Avg.
69°
47°
25
Hist. Avg.
69°
47°
26
Hist. Avg.
68°
46°
27
Hist. Avg.
68°
46°
28
Hist. Avg.
68°
46°
29
Hist. Avg.
67°
45°
30
Hist. Avg.
67°
45°
1
Hist. Avg.
66°
44°
2
Hist. Avg.
66°
44°
3
Hist. Avg.
66°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Rock Springs
Rock Springs's September 2026 forecast shows daily high temperatures ranging from 68° to 77°, with overnight lows between 46° and 55°. The average high for September is 73° with an average low of 51°. 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.
