S
M
T
W
T
F
S
30
90°
72°
31
91°
72°
1
91°
71°
2
90°
71°
3
90°
70°
4
89°
72°
5
91°
71°
6
90°
70°
7
90°
68°
8
87°
68°
9
89°
70°
10
87°
67°
11
88°
68°
12
87°
69°
13
88°
68°
14
90°
70°
15
89°
69°
16
85°
69°
17
88°
67°
18
88°
68°
19
84°
69°
20
86°
64°
21
84°
63°
22
82°
64°
23
82°
67°
24
83°
67°
25
86°
66°
26
87°
67°
27
84°
67°
28
84°
66°
29
83°
66°
30
82°
66°
1
83°
65°
2
84°
60°
3
81°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Montrose
Montrose's September 2026 forecast shows daily high temperatures ranging from 81° to 91°, with overnight lows between 60° and 72°. The average high for September is 87° with an average low of 68°. 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 Montrose. See also: October | November | December.
