Daylight in Ireland in September: About 12.5 Hours

Average Daylight Duration

In September, Ireland experiences roughly 12 hours 30 minutes of daylight on average, transitioning rapidly from summer's long days to autumn's shortening ones.

Monthly Progression (Dublin Reference)

• Sep 1: Sunrise ~6:35 AM, Sunset ~7:55 PM → 13h 20m daylight.
• Sep 15: Sunrise ~6:55 AM, Sunset ~7:25 PM → 12h 30m.
• Sep 30: Sunrise ~7:15 AM, Sunset ~6:55 PM → 11h 40m.

Regional Variation

• North (Malin Head, Donegal): ~15–20 minutes more daylight than south in early Sep; difference shrinks by month end.
• South (Mizen Head, Cork): Slightly less daylight.
• East vs. West: Negligible difference in day length; sunset ~20 min later in west.

Twilight & "Real" Light

Civil twilight adds ~30–40 min of usable light before sunrise/after sunset. "Golden hour" photography is spectacular in September due to low sun angle and frequent clear spells.

Weather Context

September is often one of Ireland's best months: mild (13–17°C / 55–63°F), relatively dry (but always pack rain gear), long enough days for full-day exploring. "Indian summer" spells occur.

Practical Tip

If visiting late September, plan outdoor activities for 10 AM – 5 PM; evenings darken quickly after 7 PM. Clocks go back last Sunday in October (to GMT).