Longest and shortest day in Irkutsk
In Irkutsk, Russia, the longest day of 2026 is around the June solstice on Sunday, 21 June 2026, with 16h 48m of daylight, and the shortest is around the December solstice on Monday, 21 December 2026, with 7h 41m.
| Turning point | Date | Sunrise | Sunset | Day length |
|---|---|---|---|---|
| March equinox | Friday, 20 March 2026 | 07:06 | 19:15 | 12h 9m |
| June solstice | Sunday, 21 June 2026 | 04:40 | 21:28 | 16h 48m |
| September equinox | Tuesday, 22 September 2026 | 06:48 | 19:02 | 12h 14m |
| December solstice | Monday, 21 December 2026 | 09:10 | 16:51 | 7h 41m |
| Month | Sunrise | Sunset | Day length |
|---|---|---|---|
| January | 09:05 | 17:18 | 8h 13m |
| February | 08:19 | 18:15 | 9h 55m |
| March | 07:18 | 19:06 | 11h 48m |
| April | 06:06 | 20:00 | 13h 53m |
| May | 05:08 | 20:50 | 15h 42m |
| June | 04:40 | 21:26 | 16h 45m |
| July | 04:58 | 21:18 | 16h 19m |
| August | 05:45 | 20:28 | 14h 43m |
| September | 06:36 | 19:18 | 12h 42m |
| October | 07:27 | 18:09 | 10h 42m |
| November | 08:23 | 17:10 | 8h 48m |
| December | 09:05 | 16:49 | 7h 44m |
Why the day gets longer and shorter in Irkutsk
Earth's axis is tilted about 23.4 degrees, so as the planet orbits the Sun, Irkutsk leans toward the Sun for part of the year and away for the rest. When it leans toward the Sun the days lengthen and the Sun climbs higher; half a year later the opposite happens. The size of the swing depends on how far Irkutsk sits from the equator: the further away, the bigger the difference between the longest and shortest day.
Frequently asked questions about day length in Irkutsk
When is the longest day in Irkutsk?
The longest day in Irkutsk falls around the June solstice, on Sunday, 21 June 2026 in 2026, with about 16h 48m of daylight, sunrise at 04:40 and sunset at 21:28.
When is the shortest day in Irkutsk?
The shortest day in Irkutsk falls around the December solstice, on Monday, 21 December 2026 in 2026, with about 7h 41m of daylight, sunrise at 09:10 and sunset at 16:51.
How much does day length change through the year in Irkutsk?
Between the longest and shortest day, Irkutsk gains and loses about 9h 7m of daylight. The change is fastest around the March and September equinoxes and slowest near the solstices.
Every figure is computed from Irkutsk's coordinates with SunCalc, not looked up from a table.