ISO WEEK
4
2026
January 19 – January 25, 2026
Week 4 of 53
8% through 2026
Days in Week 4
MonJanuary 19
Martin Luther King Jr. Day
🌑 New Moon
TueJanuary 20
🌑 New Moon
WedJanuary 21
🌒 Waxing Crescent
ThuJanuary 22
🌒 Waxing Crescent
FriJanuary 23
🌒 Waxing Crescent
SatJanuary 24
🌓 First Quarter
SunJanuary 25
🌓 First Quarter
Federal Holidays This Week
- Martin Luther King Jr. Day — Monday, January 19
Moon Phases This Week
- 🌑 New Moon — Monday, January 19
- 🌑 New Moon — Tuesday, January 20
- 🌒 Waxing Crescent — Wednesday, January 21
- 🌒 Waxing Crescent — Thursday, January 22
- 🌒 Waxing Crescent — Friday, January 23
- 🌓 First Quarter — Saturday, January 24
- 🌓 First Quarter — Sunday, January 25
FAQs
When does Week 4 2026 start and end?
Week 4 of 2026 starts on January 19 (Monday) and ends on January 25, 2026 (Sunday).
What month is Week 4 in?
Week 4 of 2026 is primarily in January.
How many weeks are in 2026?
2026 has 53 ISO weeks. 2026 is a long year with 53 weeks.
