Verdict: Good month
Dublin Weather in September
September is mild-to-cool in Dublin, topping out near 17°C (63°F) — comfortable with a layer on. Expect showers on roughly 12 days of the month — rarely trip-ruining, worth planning around. Overall, September is a solid month to visit Dublin.
Average high
17°C / 63°F
Average low
12°C / 54°F
Rain days
~12
Precipitation
88 mm
What to pack for Dublin in September
- Layers — t-shirts under a light jacket or sweater
- Rain gear is non-negotiable — expect rain on roughly 12 days
- Comfortable walking shoes — every guide on this site assumes you'll use them
September against the rest of the year
Warmest in Dublin: Jul (19°C / 66°F) · Coolest: Jan (8°C / 46°F) · Wettest: Oct (~18 rain days)
8°
4°
Jan
10°
5°
Feb
10°
5°
Mar
12°
6°
Apr
15°
9°
May
18°
12°
Jun
19°
13°
Jul
19°
13°
Aug
17°
12°
Sep
15°
10°
Oct
11°
7°
Nov
9°
5°
Dec
Daily highs / lows in °C · bars show rain days per month · ERA5 climate normals (2020–2024)