S
M
T
W
T
F
S
30
85°
56°
31
85°
59°
1
87°
60°
2
90°
60°
3
90°
57°
4
84°
59°
5
84°
56°
6
87°
54°
7
84°
53°
8
83°
55°
9
86°
56°
10
89°
58°
11
89°
58°
12
90°
59°
13
91°
58°
14
90°
55°
15
85°
55°
16
85°
58°
17
88°
58°
18
88°
57°
19
89°
56°
20
90°
57°
21
88°
58°
22
85°
54°
23
82°
51°
24
80°
50°
25
79°
49°
26
80°
51°
27
79°
54°
28
82°
52°
29
86°
49°
30
80°
50°
1
Hist. Avg.
82°
53°
2
Hist. Avg.
82°
52°
3
Hist. Avg.
82°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Dublin
Dublin's September 2026 forecast shows daily high temperatures ranging from 79° to 91°, with overnight lows between 49° and 60°. The average high for September is 86° with an average low of 55°. 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 Dublin. See also: October | November | December.
