July 21, 2026 · Boulogne-Billancourt, France
Sunset in Boulogne-Billancourt today is at 21:45. Day length is 15h 35m. See below for sunrise, solar noon, dawn and dusk — all times calculated astronomically for Boulogne-Billancourt's coordinates and updated daily.
Boulogne-Billancourt lies at 49°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 Boulogne-Billancourt.
The longest day in Boulogne-Billancourt is around 16h 11m (around June 21). The shortest is around 8h 15m (around December 21). Days are currently getting shorter — losing about 2 minutes per day.
| Month | Sunset | Sunrise | Day length |
|---|---|---|---|
| January | 17:22 | 08:40 | 8h 42m |
| February | 18:12 | 08:01 | 10h 11m |
| March | 18:56 | 07:06 | 11h 50m |
| April | 20:42 | 07:01 | 13h 41m |
| May | 21:26 | 06:11 | 15h 15m |
| June | 21:57 | 05:48 | 16h 9m |
| July | 21:51 | 06:04 | 15h 47m |
| August | 21:09 | 06:44 | 14h 25m |
| September | 20:07 | 07:28 | 12h 38m |
| October | 19:04 | 08:11 | 10h 52m |
| November | 17:13 | 08:00 | 9h 12m |
| December | 16:55 | 08:38 | 8h 17m |