S
M
T
W
T
F
S
30
91°
67°
31
87°
63°
1
85°
60°
2
82°
60°
3
81°
61°
4
82°
64°
5
85°
69°
6
80°
67°
7
85°
68°
8
90°
68°
9
88°
66°
10
86°
64°
11
84°
65°
12
82°
63°
13
83°
63°
14
84°
64°
15
86°
62°
16
89°
66°
17
88°
65°
18
81°
60°
19
82°
61°
20
85°
63°
21
87°
64°
22
85°
64°
23
84°
65°
24
83°
62°
25
83°
64°
26
87°
65°
27
87°
65°
28
86°
64°
29
86°
64°
30
85°
63°
1
86°
64°
2
85°
63°
3
82°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in La Crescenta-Montrose
La Crescenta-Montrose's September 2026 forecast shows daily high temperatures ranging from 80° to 90°, with overnight lows between 60° and 69°. The average high for September is 85° with an average low of 64°. 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 La Crescenta-Montrose. See also: October | November | December.
