S
M
T
W
T
F
S
30
79°
49°
31
80°
49°
1
78°
50°
2
78°
50°
3
77°
51°
4
76°
50°
5
78°
50°
6
77°
49°
7
76°
48°
8
75°
46°
9
74°
47°
10
76°
53°
11
74°
46°
12
74°
46°
13
77°
45°
14
77°
52°
15
76°
52°
16
75°
49°
17
73°
44°
18
73°
43°
19
74°
44°
20
78°
49°
21
74°
45°
22
71°
46°
23
74°
47°
24
75°
48°
25
76°
47°
26
70°
39°
27
73°
41°
28
67°
40°
29
66°
39°
30
66°
39°
1
Hist. Avg.
69°
46°
2
Hist. Avg.
69°
46°
3
Hist. Avg.
68°
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 66° to 80°, with overnight lows between 39° and 53°. The average high for September is 75° with an average low of 47°. 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.
