Week 4 in 2026

WEEK
4

This week starts on Sunday, January 18, 2026 and ends on Saturday, January 24, 2026.

WEEK EUROPE & ISO
4

This week starts on Monday, January 19, 2026 and ends on Sunday, January 25, 2026.

Week 4 of 2026 begins on January 19, 2026 and ends on January 25, 2026. It covers days 19 to 25 of the year and falls in quarter 1.

Weeks since this week: 38

Week 4 of 2026 at a glance

Starts (Monday)January 19, 2026
Ends (Sunday)January 25, 2026
US week (Sunday to Saturday)4 (January 18, 2026)
MonthJanuary
QuarterQ1
Days of the year19–25
Year completed at the end of this week6.8%
Weeks left in 2026 after this week49
Weeks in 202653
Even or odd weekEven

All days in Week 4:

  • Monday, January 19, 2026
  • Tuesday, January 20, 2026
  • Wednesday, January 21, 2026
  • Thursday, January 22, 2026
  • Friday, January 23, 2026
  • Saturday, January 24, 2026
  • Sunday, January 25, 2026

Calendar for January 2026

January 2026
SuMoTuWeThFrSa
Week 1123
Week 245678910
Week 311121314151617
Week 418192021222324
Week 525262728293031
USA Calendar

All Weeks in 2026:

Past & Future Week 4:

US and ISO week numbers

In the US system, where weeks start on Sunday and week 1 is the week that contains 1 January, this is week 4 of 2026. It runs from January 18, 2026 to January 24, 2026.

Even and odd weeks

Week 4 is an even week. Even and odd week numbers are used for alternating schedules such as shift rotas, school timetables, custody arrangements and waste collection.

Week 4 in other years

FromTo
Week 4 in 2024January 22, 2024January 28, 2024
Week 4 in 2025January 20, 2025January 26, 2025
Week 4 in 2027January 25, 2027January 31, 2027
Week 4 in 2028January 24, 2028January 30, 2028

How week numbers are counted

Most of the world numbers weeks according to the ISO 8601 standard. A week starts on Monday, and week 1 is the week that contains the first Thursday of the year, which is always the week that contains 4 January.

Week 1 of 2026 began on December 29, 2025. 2026 has 53 ISO weeks, because 1 January 2026 falls on a Thursday.

Because of this rule, the first days of January can belong to the last week of the previous year, and the last days of December can belong to week 1 of the next year.

In the United States, weeks usually start on Sunday and week 1 is the week that contains 1 January, so the US week number can differ from the ISO week number.

Find the week number of a date

Frequently Asked Questions (FAQ)

When does week 4 of 2026 start and end?

Week 4 of 2026 starts on January 19, 2026 and ends on January 25, 2026 (ISO 8601, Monday to Sunday).

Which month is week 4 of 2026 in?

Week 4 of 2026 is in January.

What dates are in week 4 of 2026?

January 19, 2026, January 20, 2026, January 21, 2026, January 22, 2026, January 23, 2026, January 24, 2026, and January 25, 2026

How many weeks does 2026 have?

2026 has 53 ISO weeks, because 1 January 2026 falls on a Thursday.

Is week 4 an even or odd week?

Week 4 is an even week.

What is the US week number for this week?

In the US system, where weeks start on Sunday and week 1 is the week that contains 1 January, this is week 4 of 2026. It runs from January 18, 2026 to January 24, 2026.

Overview of Week 4

Week 4 of the year is often a time of settling into new routines. The initial excitement of the New Year has worn off, and people are beginning to find their groove. This week can be significant for various reasons, including notable events and observances. Let's dive into what makes Week 4 special and what you can expect during this time.

Summary of Week 4

Week 4 usually falls in late January, a time when winter is in full swing in many parts of the world. Key aspects of this week include:

  • Important dates such as Martin Luther King Jr. Day (in the U.S.) or Australia Day.
  • Common themes like reflection on New Year's resolutions and winter activities.
  • Approaches to this week often involve a mix of work, planning, and leisure.

Major Themes Associated with Week 4

Several themes are commonly associated with Week 4:

  • Reflection: People often reflect on their New Year's resolutions, assessing their progress and making adjustments.
  • Winter Activities: In many regions, winter sports and activities like skiing, snowboarding, and ice skating are popular.
  • Planning: This week is also a time for planning the year ahead, both personally and professionally.

Significant Historical Events, Holidays, and Observances

Week 4 has its share of significant events and holidays:

  • Martin Luther King Jr. Day: Celebrated on the third Monday of January in the United States, this day honors the civil rights leader's contributions and legacy.
  • Australia Day: Observed on January 26, Australia Day marks the arrival of the First Fleet at Port Jackson in New South Wales in 1788.
  • International Holocaust Remembrance Day: Held on January 27, this day commemorates the victims of the Holocaust.

Interesting Facts, Statistics, and Cultural Insights

Week 4 has some fascinating aspects worth noting:

  • Winter Sports Popularity: According to statistics, winter sports see a significant uptick in participation during this time, with skiing and snowboarding being among the most popular.
  • New Year's Resolution Drop-off: Studies show that by Week 4, many people begin to falter on their New Year's resolutions. Approximately 80% of resolutions fail by the second week of February.
  • Historical Weather Patterns: In the Northern Hemisphere, Week 4 often experiences some of the coldest temperatures of the year, making it a prime time for winter activities.

Suggested Activities and Practices for Week 4

Here are some activities and practices to consider during Week 4:

  1. Review and Adjust Resolutions: Take time to review your New Year's resolutions. Assess what's working and what isn't, and make necessary adjustments to stay on track.
  2. Engage in Winter Sports: If you're in a region with winter weather, consider engaging in activities like skiing, snowboarding, or ice skating. These can be great for physical health and mental well-being.
  3. Plan Ahead: Use this week to plan for the upcoming months. Set goals, create schedules, and organize your tasks to ensure a productive year.
  4. Celebrate Holidays: Participate in observances like Martin Luther King Jr. Day or Australia Day. These celebrations can provide a sense of community and historical awareness.
  5. Stay Warm and Cozy: Embrace the winter season by staying warm indoors. Enjoy activities like reading, cooking comfort foods, or watching movies with loved ones.

Conclusion

Week 4 is a unique time of the year that offers a blend of reflection, activity, and planning. Whether you're engaging in winter sports, celebrating important holidays, or adjusting your New Year's resolutions, this week provides ample opportunities for growth and enjoyment.