S
M
T
W
T
F
S
30
80°
59°
31
84°
62°
1
85°
61°
2
84°
61°
3
84°
54°
4
78°
52°
5
77°
56°
6
82°
60°
7
83°
60°
8
83°
59°
9
77°
58°
10
76°
59°
11
82°
58°
12
83°
59°
13
82°
58°
14
82°
58°
15
81°
57°
16
81°
58°
17
80°
54°
18
80°
49°
19
72°
47°
20
73°
46°
21
71°
46°
22
71°
48°
23
72°
47°
24
75°
45°
25
71°
49°
26
74°
53°
27
70°
52°
28
76°
52°
29
75°
51°
30
76°
51°
1
73°
49°
2
75°
51°
3
69°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Ireland
Ireland's September 2026 forecast shows daily high temperatures ranging from 69° to 85°, with overnight lows between 45° and 62°. The average high for September is 78° with an average low of 54°. 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 Ireland. See also: October | November | December.
