S
M
T
W
T
F
S
30
N/A
31
74°
55°
1
72°
53°
2
73°
50°
3
71°
53°
4
77°
57°
5
75°
58°
6
80°
57°
7
73°
57°
8
74°
58°
9
77°
57°
10
76°
58°
11
76°
53°
12
78°
56°
13
79°
57°
14
79°
58°
15
78°
57°
16
78°
57°
17
77°
55°
18
74°
50°
19
70°
49°
20
71°
50°
21
73°
53°
22
74°
53°
23
74°
51°
24
70°
47°
25
64°
45°
26
64°
45°
27
63°
44°
28
64°
45°
29
65°
46°
30
65°
46°
1
64°
45°
2
66°
50°
3
70°
51°
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 63° to 80°, with overnight lows between 44° and 58°. The average high for September is 72° with an average low of 52°. 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.
