S
M
T
W
T
F
S
30
82°
63°
31
82°
63°
1
81°
59°
2
75°
56°
3
74°
56°
4
74°
55°
5
75°
55°
6
79°
59°
7
81°
62°
8
80°
61°
9
77°
60°
10
78°
61°
11
81°
61°
12
80°
60°
13
81°
62°
14
80°
52°
15
73°
52°
16
70°
51°
17
71°
52°
18
79°
58°
19
80°
59°
20
80°
59°
21
78°
52°
22
77°
48°
23
69°
49°
24
68°
52°
25
69°
56°
26
72°
56°
27
75°
55°
28
74°
55°
29
75°
54°
30
75°
55°
1
74°
54°
2
74°
47°
3
72°
45°
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 68° to 82°, with overnight lows between 45° 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 Demarest. See also: October | November | December.
