July 21, 2026 · Merthyr Tydfil, Wales
Sunset in Merthyr Tydfil today is at 21:20. Day length is 15h 60m. See below for sunrise, solar noon, dawn and dusk — all times calculated astronomically for Merthyr Tydfil's coordinates and updated daily.
Merthyr Tydfil lies at 52°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 Merthyr Tydfil.
The longest day in Merthyr Tydfil is around 16h 41m (around June 21). The shortest is around 7h 47m (around December 21). Days are currently getting shorter — losing about 3 minutes per day.
| Month | Sunset | Sunrise | Day length |
|---|---|---|---|
| January | 16:31 | 08:15 | 8h 16m |
| February | 17:26 | 07:31 | 9h 55m |
| March | 18:16 | 06:31 | 11h 44m |
| April | 20:08 | 06:21 | 13h 48m |
| May | 20:58 | 05:23 | 15h 35m |
| June | 21:34 | 04:55 | 16h 38m |
| July | 21:28 | 05:12 | 16h 16m |
| August | 20:41 | 05:57 | 14h 44m |
| September | 19:33 | 06:47 | 12h 46m |
| October | 18:24 | 07:36 | 10h 48m |
| November | 16:27 | 07:31 | 8h 55m |
| December | 16:04 | 08:14 | 7h 50m |