S
M
T
W
T
F
S
30
82°
63°
31
79°
69°
1
84°
68°
2
72°
65°
3
88°
67°
4
85°
73°
5
80°
68°
6
78°
64°
7
80°
57°
8
81°
58°
9
88°
63°
10
87°
70°
11
80°
65°
12
81°
57°
13
85°
67°
14
75°
58°
15
78°
54°
16
86°
58°
17
87°
70°
18
82°
69°
19
71°
61°
20
70°
57°
21
69°
55°
22
65°
52°
23
65°
54°
24
63°
49°
25
65°
48°
26
68°
49°
27
68°
50°
28
66°
51°
29
67°
49°
30
70°
52°
1
68°
50°
2
70°
49°
3
66°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Demarest
Demarest's September 2026 forecast shows daily high temperatures ranging from 63° to 71°, with overnight lows between 48° and 61°. The average high for September is 67° 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 Demarest. See also: October | November | December.
