July 21, 2026 · Letterkenny, Ireland
Sunset in Letterkenny today is at 21:54. Day length is 16h 32m. See below for sunrise, solar noon, dawn and dusk — all times calculated astronomically for Letterkenny's coordinates and updated daily.
Letterkenny lies at 55°N. At this latitude, day length varies significantly through the year — from roughly 7–8 hours in midwinter to 16–17 hours at midsummer.
Sunset shifts later through spring and earlier through autumn — changing fastest near the equinoxes and slowest near the summer and winter solstices. See the year chart to visualise how sunset times shift month by month for Letterkenny.
The longest day in Letterkenny is around 17h 22m (around June 21). The shortest is around 7h 11m (around December 21). Days are currently getting shorter — losing about 3 minutes per day.
| Month | Sunset | Sunrise | Day length |
|---|---|---|---|
| January | 16:33 | 08:48 | 7h 44m |
| February | 17:35 | 07:57 | 9h 38m |
| March | 18:32 | 06:50 | 11h 42m |
| April | 20:32 | 06:31 | 14h 1m |
| May | 21:30 | 05:26 | 16h 3m |
| June | 22:11 | 04:53 | 17h 18m |
| July | 22:03 | 05:11 | 16h 52m |
| August | 21:09 | 06:04 | 15h 5m |
| September | 19:53 | 07:02 | 12h 51m |
| October | 18:37 | 07:58 | 10h 38m |
| November | 16:31 | 08:01 | 8h 30m |
| December | 16:04 | 08:49 | 7h 14m |