When to go · September

Ireland in September

Excellent time to go

Atlantic swells build for surfers at Bundoran and Lahinch after September equinox.

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Daytime high

17°C

63°F

Overnight low

10°C

50°F

Rainfall

66 mm

moderate

Crowd levels

medium

manageable

Prices

medium

shoulder

What to expect in Ireland in September

September brings mild weather to Ireland, with daytime highs around 17°C (63°F) and overnight lows near 10°C (50°F). Skies are typically dry with occasional showers, with about 66 mm of rainfall on average. Atlantic swells build for surfers at Bundoran and Lahinch after September equinox..

Crowds are manageable in September — busy in popular areas but not overwhelming. Prices sit in the shoulder-season range — not the cheapest, but well off peak. Peak season runs June–August, for context.

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