Weather in Irland in september
Country-wide climate normals across 15 cities in Irland.
How Hot Is Irland in september?
Mild conditions are universal across Irland in September: highs near 16°C in Dublin, similar elsewhere.
Sunshine in Irland in september
Irland sees limited sun in September: just 2.1h a day in Dublin, with heavy cloud cover common across most regions. Daylight runs from 7:00 am to 7:40 pm, but persistent grey skies and overcast stretches mean direct sunlight is genuinely scarce. Many days pass without any prolonged sunny spells.
Does It Rain In Irland In september?
Irland sees moderate rainfall in September — Dublin averages 97mm across 13 days, with notable regional variation. Coastal cities often see more rain than the inland average, while drier regions see less. The country's September weather mixes sunny stretches with regular shower spells.
Is Irland Humid In september?
Irland is enveloped in tropical-thick humidity through September: Dublin averages 85%, and most of the country tracks similarly. The constant moisture makes warm temperatures feel substantially hotter, and even nights bring limited cooling. Light cotton clothing is essential.
Wind In Irland In september
Irland sees consistent breezes in September — averaging 22 kph in Dublin, with similar windy conditions across most regions. Coastal and exposed inland cities often see considerably more, especially in the afternoons. Wind-sensitive plans should factor this in.
Cloud Cover In Irland In september
Cloudy skies dominate Irland in September — 73% cover in Dublin, with similar overcast conditions in most regions. Direct sun is patchy and broken; expect grey stretches between brief bright moments. Coastal areas may be heavier than inland.