S
M
T
W
T
F
S
30
72°
53°
31
77°
47°
1
76°
53°
2
77°
55°
3
78°
55°
4
81°
54°
5
83°
58°
6
80°
52°
7
74°
52°
8
79°
45°
9
78°
46°
10
80°
46°
11
81°
53°
12
83°
47°
13
85°
56°
14
71°
46°
15
79°
39°
16
73°
52°
17
75°
54°
18
76°
48°
19
65°
43°
20
68°
44°
21
73°
48°
22
71°
46°
23
76°
46°
24
78°
44°
25
81°
45°
26
76°
43°
27
75°
42°
28
74°
41°
29
72°
39°
30
67°
37°
1
69°
36°
2
69°
40°
3
68°
38°
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 65° to 81°, with overnight lows between 36° and 48°. The average high for September is 72° with an average low of 43°. 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.
