S
M
T
W
T
F
S
30
84°
64°
31
77°
64°
1
77°
63°
2
78°
59°
3
76°
55°
4
75°
54°
5
75°
55°
6
76°
57°
7
80°
61°
8
83°
61°
9
82°
58°
10
80°
60°
11
74°
49°
12
73°
52°
13
71°
51°
14
72°
48°
15
73°
54°
16
74°
50°
17
72°
50°
18
73°
49°
19
72°
47°
20
70°
47°
21
70°
48°
22
71°
47°
23
71°
48°
24
73°
53°
25
77°
56°
26
77°
56°
27
71°
55°
28
74°
51°
29
70°
45°
30
70°
47°
1
69°
54°
2
76°
43°
3
77°
42°
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 69° to 84°, with overnight lows between 42° and 64°. The average high for September is 75° with an average low of 53°. 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.
