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When is Marine Day in 2026 in Japan?

Marine Day 2026 is on Monday, 2026-07-20

Marine Day in Japan falls on Monday, July 20, 2026. That is week 30 of 2026 (ISO week numbering), day 201 of the year. Locally it is also written as: 海の日.

Days until Marine Day 2026

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Marine Day by year in Japan

YearWeekdayDateISO week
2026Monday2026-07-2030this page
2027Monday2027-07-19292027 page

Public holidays near this date in Japan 2026

DateDayHolidayDeducted from working days
2026-07-20Monday海の日Yes

Working days around this holiday

The July 2026 business-days page shows the exact count of working days in the month this holiday falls in, with the holiday deducted and every remaining day listed. The full Japan 2026 holiday list marks whether this date is nationwide (Yes) or regional only.

How the date is verified: the date and weekday above are computed from the calendar, not typed in, and ISO week numbers follow ISO 8601 (weeks start Monday). You can reproduce both by checking that 2026-07-20 is a Monday on any perpetual calendar.

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