S
M
T
W
T
F
S
30
80°
63°
31
81°
62°
1
83°
61°
2
76°
58°
3
75°
58°
4
76°
60°
5
80°
60°
6
82°
61°
7
83°
62°
8
83°
62°
9
82°
61°
10
81°
60°
11
81°
60°
12
82°
61°
13
82°
61°
14
77°
51°
15
70°
52°
16
72°
54°
17
74°
55°
18
80°
57°
19
80°
56°
20
79°
53°
21
73°
48°
22
69°
50°
23
68°
54°
24
67°
55°
25
68°
54°
26
72°
54°
27
76°
55°
28
77°
54°
29
77°
54°
30
76°
53°
1
76°
45°
2
71°
42°
3
62°
40°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Crestline
Crestline's September 2026 forecast shows daily high temperatures ranging from 62° to 83°, with overnight lows between 40° and 63°. The average high for September is 76° with an average low of 56°. 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 Crestline. See also: October | November | December.
