S
M
T
W
T
F
S
30
83°
57°
31
85°
60°
1
81°
57°
2
79°
54°
3
80°
53°
4
75°
53°
5
82°
52°
6
72°
55°
7
60°
52°
8
60°
52°
9
61°
51°
10
78°
59°
11
89°
61°
12
88°
57°
13
86°
58°
14
72°
50°
15
75°
50°
16
77°
51°
17
86°
62°
18
87°
62°
19
88°
60°
20
78°
52°
21
72°
50°
22
72°
50°
23
77°
54°
24
83°
57°
25
82°
58°
26
84°
59°
27
85°
59°
28
86°
60°
29
86°
60°
30
84°
59°
1
85°
60°
2
82°
60°
3
85°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Leinster
Leinster's September 2026 forecast shows daily high temperatures ranging from 60° to 89°, with overnight lows between 50° and 62°. The average high for September is 80° with an average low of 56°. 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 Leinster. See also: October | November | December.
