ISO WEEK
51
2026
December 14 – December 20, 2026
Week 51 of 53
96% through 2026
Days in Week 51
MonDecember 14
🌒 Waxing Crescent
TueDecember 15
🌓 First Quarter
WedDecember 16
🌓 First Quarter
ThuDecember 17
🌓 First Quarter
FriDecember 18
🌓 First Quarter
SatDecember 19
🌔 Waxing Gibbous
SunDecember 20
🌔 Waxing Gibbous
Moon Phases This Week
- 🌒 Waxing Crescent — Monday, December 14
- 🌓 First Quarter — Tuesday, December 15
- 🌓 First Quarter — Wednesday, December 16
- 🌓 First Quarter — Thursday, December 17
- 🌓 First Quarter — Friday, December 18
- 🌔 Waxing Gibbous — Saturday, December 19
- 🌔 Waxing Gibbous — Sunday, December 20
FAQs
When does Week 51 2026 start and end?
Week 51 of 2026 starts on December 14 (Monday) and ends on December 20, 2026 (Sunday).
What month is Week 51 in?
Week 51 of 2026 is primarily in December.
How many weeks are in 2026?
2026 has 53 ISO weeks. 2026 is a long year with 53 weeks.
