S
M
T
W
T
F
S
30
93°
71°
31
96°
73°
1
97°
71°
2
98°
73°
3
97°
73°
4
92°
72°
5
91°
73°
6
94°
71°
7
92°
72°
8
88°
69°
9
90°
68°
10
91°
68°
11
92°
66°
12
92°
67°
13
90°
67°
14
89°
66°
15
86°
64°
16
86°
63°
17
83°
65°
18
80°
66°
19
82°
65°
20
83°
66°
21
84°
66°
22
87°
65°
23
87°
65°
24
86°
64°
25
82°
65°
26
81°
64°
27
84°
59°
28
78°
55°
29
77°
54°
30
79°
54°
1
78°
55°
2
80°
57°
3
78°
54°
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 77° to 97°, with overnight lows between 54° and 73°. The average high for September is 86° with an average low of 64°. 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.
