S
M
T
W
T
F
S
30
80°
61°
31
79°
69°
1
78°
67°
2
74°
65°
3
88°
69°
4
85°
73°
5
80°
68°
6
73°
61°
7
79°
57°
8
80°
61°
9
80°
63°
10
87°
72°
11
79°
62°
12
N/A
13
81°
69°
14
77°
59°
15
73°
64°
16
78°
65°
17
82°
65°
18
80°
62°
19
75°
60°
20
74°
59°
21
72°
55°
22
73°
56°
23
71°
56°
24
74°
57°
25
74°
57°
26
69°
54°
27
73°
61°
28
77°
59°
29
77°
58°
30
71°
53°
1
70°
55°
2
71°
59°
3
75°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Uniondale
Uniondale's September 2026 forecast shows daily high temperatures ranging from 69° to 82°, with overnight lows between 53° and 69°. The average high for September is 75° with an average low of 59°. 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 Uniondale. See also: October | November | December.
