July 21, 2026 · Boulogne-Billancourt, France
Boulogne-Billancourt has 15h 35m of daylight today. Sunrise is at 06:11 and sunset is at 21:45. All times are calculated astronomically for Boulogne-Billancourt's exact coordinates.
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.
Day length changes fastest near the spring and autumn equinoxes and slowest near the longest day and shortest day of the year. See the year chart to visualise how daylight hours shift month by month for Boulogne-Billancourt, or see daylight hours for every day of the year.
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 | Day length | Sunrise | Sunset |
|---|---|---|---|
| January | 8h 42m | 08:40 | 17:22 |
| February | 10h 11m | 08:01 | 18:12 |
| March | 11h 50m | 07:06 | 18:56 |
| April | 13h 41m | 07:01 | 20:42 |
| May | 15h 15m | 06:11 | 21:26 |
| June | 16h 9m | 05:48 | 21:57 |
| July | 15h 47m | 06:04 | 21:51 |
| August | 14h 25m | 06:44 | 21:09 |
| September | 12h 38m | 07:28 | 20:07 |
| October | 10h 52m | 08:11 | 19:04 |
| November | 9h 12m | 08:00 | 17:13 |
| December | 8h 17m | 08:38 | 16:55 |