S
M
T
W
T
F
S
30
91°
63°
31
90°
66°
1
N/A
2
95°
70°
3
94°
70°
4
89°
68°
5
84°
60°
6
81°
57°
7
80°
59°
8
82°
61°
9
86°
64°
10
83°
60°
11
80°
53°
12
77°
54°
13
77°
52°
14
78°
53°
15
81°
58°
16
78°
57°
17
78°
57°
18
77°
55°
19
80°
57°
20
80°
57°
21
79°
56°
22
80°
56°
23
81°
55°
24
80°
56°
25
80°
55°
26
78°
54°
27
79°
55°
28
78°
54°
29
79°
53°
30
77°
52°
1
77°
52°
2
76°
51°
3
77°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Adelphi
Adelphi's September 2026 forecast shows daily high temperatures ranging from 76° to 95°, with overnight lows between 51° and 70°. The average high for September is 81° with an average low of 57°. 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 Adelphi. See also: October | November | December.
