S
M
T
W
T
F
S
30
79°
56°
31
76°
61°
1
77°
65°
2
74°
67°
3
82°
64°
4
83°
59°
5
78°
56°
6
74°
53°
7
78°
54°
8
76°
52°
9
74°
51°
10
79°
55°
11
78°
54°
12
76°
54°
13
76°
51°
14
75°
48°
15
72°
48°
16
72°
52°
17
75°
46°
18
70°
43°
19
70°
43°
20
72°
47°
21
75°
51°
22
78°
52°
23
79°
50°
24
78°
49°
25
76°
47°
26
76°
48°
27
77°
49°
28
76°
48°
29
75°
45°
30
67°
40°
1
65°
40°
2
68°
46°
3
73°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Ulster
Ulster's September 2026 forecast shows daily high temperatures ranging from 65° to 83°, with overnight lows between 40° and 67°. The average high for September is 75° with an average low of 51°. 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 Ulster. See also: October | November | December.
