Longest and shortest day in Buenos Aires
In Buenos Aires, Argentina, the longest day of 2026 is around the December solstice on Monday, 21 December 2026, with 14h 29m of daylight, and the shortest is around the June solstice on Sunday, 21 June 2026, with 9h 50m.
| Turning point | Date | Sunrise | Sunset | Day length |
|---|---|---|---|---|
| March equinox | Friday, 20 March 2026 | 06:56 | 19:04 | 12h 8m |
| June solstice | Sunday, 21 June 2026 | 08:00 | 17:50 | 9h 50m |
| September equinox | Tuesday, 22 September 2026 | 06:42 | 18:50 | 12h 7m |
| December solstice | Monday, 21 December 2026 | 05:37 | 20:06 | 14h 29m |
| Month | Sunrise | Sunset | Day length |
|---|---|---|---|
| January | 05:56 | 20:09 | 14h 13m |
| February | 06:27 | 19:47 | 13h 19m |
| March | 06:52 | 19:11 | 12h 19m |
| April | 07:16 | 18:29 | 11h 13m |
| May | 07:40 | 17:59 | 10h 19m |
| June | 07:58 | 17:49 | 9h 51m |
| July | 07:58 | 18:01 | 10h 3m |
| August | 07:33 | 18:23 | 10h 50m |
| September | 06:52 | 18:45 | 11h 52m |
| October | 06:11 | 19:07 | 12h 57m |
| November | 05:40 | 19:36 | 13h 56m |
| December | 05:34 | 20:02 | 14h 28m |
Why the day gets longer and shorter in Buenos Aires
Earth's axis is tilted about 23.4 degrees, so as the planet orbits the Sun, Buenos Aires 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 Buenos Aires sits from the equator: the further away, the bigger the difference between the longest and shortest day.
Frequently asked questions about day length in Buenos Aires
When is the longest day in Buenos Aires?
The longest day in Buenos Aires falls around the December solstice, on Monday, 21 December 2026 in 2026, with about 14h 29m of daylight, sunrise at 05:37 and sunset at 20:06.
When is the shortest day in Buenos Aires?
The shortest day in Buenos Aires falls around the June solstice, on Sunday, 21 June 2026 in 2026, with about 9h 50m of daylight, sunrise at 08:00 and sunset at 17:50.
How much does day length change through the year in Buenos Aires?
Between the longest and shortest day, Buenos Aires gains and loses about 4h 39m of daylight. The change is fastest around the March and September equinoxes and slowest near the solstices.
Every figure is computed from Buenos Aires's coordinates with SunCalc, not looked up from a table.