S
M
T
W
T
F
S
30
79°
55°
31
83°
49°
1
78°
45°
2
73°
46°
3
72°
53°
4
71°
52°
5
81°
42°
6
72°
41°
7
68°
41°
8
68°
50°
9
72°
48°
10
78°
51°
11
76°
50°
12
78°
43°
13
70°
39°
14
69°
37°
15
64°
40°
16
67°
39°
17
72°
47°
18
75°
36°
19
65°
39°
20
64°
47°
21
74°
48°
22
76°
46°
23
73°
47°
24
73°
48°
25
74°
44°
26
75°
36°
27
71°
35°
28
59°
41°
29
61°
40°
30
60°
37°
1
59°
41°
2
60°
44°
3
69°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Glen Ullin
Glen Ullin's September 2026 forecast shows daily high temperatures ranging from 59° to 83°, with overnight lows between 35° and 55°. The average high for September is 71° with an average low of 44°. 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 Glen Ullin. See also: October | November | December.
