Dublin in September
The weather in September
In September, Dublin averages daytime highs of 18° and night-time lows of 10° — mild weather by day. Expect around 73 mm of precipitation spread over about 14 wet days, with average cloud cover near 46%.
Days are 1.9° cooler than in August on average, and October is cooler again by about 3.2°. The sea averages 15°, too cold for most swimmers.
September scores 58/100 — fair conditions for sightseeing — and ranks 4th of the twelve months for Dublin. For the most comfortable weather, consider June, July and August instead.
Around the middle of the month the sun rises at 06:59 and sets at 19:43 local time, giving 12 h 44 min of daylight. Days shorten by 120 minutes over the month.
Why 58/100?
How the score for September is builtBeach score this month: 12/100 (adds sea temperature and heat).
Comfort peaks for daytime highs between 18° and 25°C (64–77°F).
Around Dublin this month
Rathfarnham
Ireland's best in September
Rathfarnham
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Dublin in September: quick answers
Is September a good time to visit Dublin?
September scores 58/100 for Dublin, which we rate as fair. Average highs are 18°C with 14 wet days.
How warm is Dublin in September?
Daytime highs average 18°C and night-time lows 10°C in September.
Does it rain a lot in Dublin in September?
Dublin receives about 73 mm of precipitation in September, falling on around 14 days.
Can you swim in Dublin in September?
The sea averages 15°C in September, cold for most swimmers.