S
M
T
W
T
F
S
30
91°
68°
31
92°
68°
1
92°
67°
2
91°
67°
3
92°
69°
4
89°
67°
5
91°
64°
6
91°
58°
7
84°
58°
8
83°
60°
9
84°
61°
10
86°
64°
11
89°
62°
12
90°
63°
13
88°
66°
14
89°
65°
15
89°
60°
16
88°
61°
17
88°
62°
18
87°
64°
19
88°
62°
20
87°
58°
21
85°
63°
22
81°
62°
23
79°
58°
24
81°
63°
25
81°
60°
26
84°
57°
27
81°
57°
28
80°
60°
29
80°
55°
30
79°
60°
1
79°
64°
2
86°
61°
3
80°
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 79° to 92°, with overnight lows between 55° and 69°. The average high for September is 86° with an average low of 62°. 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.
