July 21, 2026 · Udon Thani, Thailand
Sunset in Udon Thani today is at 18:47. Day length is 13h 2m. See below for sunrise, solar noon, dawn and dusk — all times calculated astronomically for Udon Thani's coordinates and updated daily.
Udon Thani lies at 17°N. Near the tropics, day length stays close to 12 hours year-round, with only minor variation between seasons.
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 Udon Thani.
The longest day in Udon Thani is around 13h 10m (around June 21). The shortest is around 11h 5m (around December 21). Days are currently getting shorter — losing about 1 minute per day.
| Month | Sunset | Sunrise | Day length |
|---|---|---|---|
| January | 17:54 | 06:43 | 11h 12m |
| February | 18:11 | 06:37 | 11h 34m |
| March | 18:19 | 06:18 | 12h 1m |
| April | 18:25 | 05:54 | 12h 31m |
| May | 18:34 | 05:38 | 12h 56m |
| June | 18:45 | 05:35 | 13h 10m |
| July | 18:48 | 05:43 | 13h 5m |
| August | 18:36 | 05:53 | 12h 44m |
| September | 18:13 | 05:58 | 12h 15m |
| October | 17:48 | 06:02 | 11h 46m |
| November | 17:34 | 06:14 | 11h 20m |
| December | 17:37 | 06:32 | 11h 6m |