S
M
T
W
T
F
S
30
86°
52°
31
85°
52°
1
84°
51°
2
84°
51°
3
79°
49°
4
77°
49°
5
81°
50°
6
77°
49°
7
73°
43°
8
75°
44°
9
78°
46°
10
81°
47°
11
82°
48°
12
81°
48°
13
80°
44°
14
77°
46°
15
75°
46°
16
73°
44°
17
69°
42°
18
70°
43°
19
76°
46°
20
77°
42°
21
73°
41°
22
73°
42°
23
76°
45°
24
78°
43°
25
76°
43°
26
77°
41°
27
74°
43°
28
76°
43°
29
76°
36°
30
71°
45°
1
72°
45°
2
70°
37°
3
64°
40°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Green River
Green River's September 2026 forecast shows daily high temperatures ranging from 64° to 86°, with overnight lows between 36° and 52°. The average high for September is 76° with an average low of 45°. 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 Green River. See also: October | November | December.
