S
M
T
W
T
F
S
30
72°
53°
31
77°
47°
1
78°
56°
2
80°
53°
3
81°
58°
4
83°
58°
5
81°
55°
6
78°
53°
7
76°
52°
8
82°
49°
9
79°
43°
10
78°
44°
11
81°
46°
12
80°
48°
13
79°
45°
14
76°
41°
15
81°
48°
16
82°
49°
17
81°
46°
18
80°
44°
19
79°
46°
20
79°
46°
21
78°
45°
22
79°
46°
23
79°
46°
24
78°
45°
25
77°
45°
26
75°
46°
27
76°
45°
28
76°
44°
29
75°
43°
30
74°
43°
1
74°
42°
2
73°
43°
3
73°
42°
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 73° to 83°, with overnight lows between 41° and 58°. The average high for September is 78° with an average low of 47°. 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.
