S
M
T
W
T
F
S
30
84°
61°
31
82°
55°
1
80°
55°
2
76°
56°
3
76°
55°
4
77°
55°
5
76°
56°
6
75°
54°
7
75°
54°
8
76°
56°
9
75°
55°
10
73°
54°
11
75°
54°
12
76°
56°
13
74°
55°
14
75°
54°
15
73°
53°
16
73°
52°
17
71°
51°
18
72°
52°
19
75°
56°
20
Hist. Avg.
77°
58°
21
Hist. Avg.
77°
58°
22
Hist. Avg.
76°
58°
23
Hist. Avg.
76°
57°
24
Hist. Avg.
76°
57°
25
Hist. Avg.
75°
56°
26
Hist. Avg.
75°
56°
27
Hist. Avg.
74°
56°
28
Hist. Avg.
74°
55°
29
Hist. Avg.
74°
55°
30
Hist. Avg.
73°
54°
1
Hist. Avg.
73°
54°
2
Hist. Avg.
72°
54°
3
Hist. Avg.
72°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Demarest
Demarest's September 2026 forecast shows daily high temperatures ranging from 71° to 84°, with overnight lows between 51° and 61°. The average high for September is 76° with an average low of 55°. 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.
