S
M
T
W
T
F
S
30
93°
69°
31
93°
66°
1
91°
69°
2
92°
70°
3
92°
68°
4
86°
69°
5
91°
68°
6
91°
69°
7
92°
70°
8
92°
69°
9
91°
69°
10
91°
68°
11
90°
69°
12
90°
63°
13
89°
61°
14
82°
60°
15
80°
61°
16
84°
62°
17
87°
65°
18
87°
64°
19
81°
63°
20
86°
64°
21
88°
66°
22
89°
64°
23
88°
58°
24
87°
57°
25
78°
57°
26
85°
54°
27
86°
63°
28
85°
63°
29
87°
63°
30
Hist. Avg.
82°
59°
1
Hist. Avg.
81°
59°
2
Hist. Avg.
81°
59°
3
Hist. Avg.
81°
58°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Muenster
Muenster's September 2026 forecast shows daily high temperatures ranging from 78° to 93°, with overnight lows between 54° and 70°. The average high for September is 88° with an average low of 65°. 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 Muenster. See also: October | November | December.
