S
M
T
W
T
F
S
30
73°
49°
31
74°
49°
1
73°
48°
2
78°
52°
3
81°
48°
4
76°
49°
5
71°
45°
6
77°
43°
7
72°
44°
8
73°
45°
9
74°
46°
10
77°
50°
11
79°
40°
12
74°
44°
13
69°
48°
14
72°
42°
15
76°
37°
16
76°
36°
17
64°
35°
18
64°
35°
19
65°
40°
20
65°
41°
21
71°
38°
22
67°
36°
23
63°
33°
24
62°
32°
25
61°
33°
26
62°
34°
27
62°
34°
28
61°
35°
29
61°
35°
30
Hist. Avg.
64°
36°
1
Hist. Avg.
64°
35°
2
Hist. Avg.
63°
35°
3
Hist. Avg.
63°
34°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Glen Ullin
Glen Ullin's September 2026 forecast shows daily high temperatures ranging from 61° to 81°, with overnight lows between 32° and 52°. The average high for September is 70° with an average low of 41°. 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.
