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Data as of 2026-10-17
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Built 2026-10-19 (19 October 2026)

Extreme rain in Japan, 18 to 20 July 2026

Extreme rain in Japan, 18 to 20 July 2026: 10 records at 7 stations, peak on 18 July 2026. Closed.

Data as of . Last revised (2026-10-17).

Key Facts

  • Extreme rain in Japan, 18 to 20 July 2026 set or tied 10 station records at 7 stations.
  • It ran from 18 July 2026 to 20 July 2026 (3 days) and its peak day was 18 July 2026.
  • Status: closed.
  • Wakamatsu set a daily record precipitation of 147.5 mm (5.8 in) on 18 July 2026.
  • The busiest day was 18 July 2026 with 4 records.
  • The oldest broken record in the ranked list had stood for 56 years.

Footprint

18 to 20 July 2026
Footprint of Extreme rain in Japan, 18 to 20 July 2026 The area covered by Extreme rain in Japan, 18 to 20 July 2026 is outlined, with 7 of the stations that set records marked, coloured by record type.
The area covered by Extreme rain in Japan, 18 to 20 July 2026 is outlined, with 7 of the stations that set records marked, coloured by record type. Made with Natural Earth.
Footprint of Extreme rain in Japan, 18 to 20 July 2026: stations that set records in the event
StationTypeValueDate
WakamatsuRecord daily precipitation147.5 mm (5.8 in)2026-07-18
KumagayaRecord daily precipitation114.0 mm (4.5 in)2026-07-18
WajimaRecord daily precipitation145.5 mm (5.7 in)2026-07-20
TateyamaRecord daily precipitation286.5 mm (11.3 in)2026-07-18
ChibaRecord daily precipitation104.0 mm (4.1 in)2026-07-19
SuwaRecord daily precipitation73.0 mm (2.9 in)2026-07-20
ShirakawaRecord daily precipitation106.5 mm (4.2 in)2026-07-18

Records per Day

Peak day 4
Records per day during Extreme rain in Japan, 18 to 20 July 2026 Records set or tied each day from 18 July 2026 to 20 July 2026. The most in one day was 4 on 18 July 2026. 0 1 2 3 4 07-1807-1907-20
Records set or tied each day from 18 July 2026 to 20 July 2026. The most in one day was 4 on 18 July 2026.
Records per day during Extreme rain in Japan, 18 to 20 July 2026
DateRecords
2026-07-184
2026-07-194
2026-07-202

Top Records by Margin

Margin over the record replaced
Top records of Extreme rain in Japan, 18 to 20 July 2026 ranked by margin
Kumagaya, 07-19104.6 mm (4.1 in)
Wakamatsu, 07-1886.5 mm (3.4 in)
Wajima, 07-2076.5 mm (3.0 in)
Tateyama, 07-1962.5 mm (2.5 in)
Tateyama, 07-1858.0 mm (2.3 in)
Kumagaya, 07-1855.0 mm (2.2 in)
Chiba, 07-1947.1 mm (1.9 in)
Wakamatsu, 07-1942.5 mm (1.7 in)
Suwa, 07-2019.0 mm (0.7 in)
Shirakawa, 07-1815.6 mm (0.6 in)

Margin is how far the new value is beyond the record it replaced. Ties are not shown.

Margin Against Age of the Broken Record

Margin against age of the broken record in Extreme rain in Japan, 18 to 20 July 2026 10 records plotted by how far they beat the old record (across) and how many years the old record had stood (up). Long standing records beaten by a wide margin sit in the top right. 0 15 30 45 60 0306090120 Margin (mm) Years the old record stood
10 records plotted by how far they beat the old record (across) and how many years the old record had stood (up). Long standing records beaten by a wide margin sit in the top right.
Margin against age of the broken record in Extreme rain in Japan, 18 to 20 July 2026
Margin (mm)Years the old record stood
8756
5555
7743
10515
4349
580
4712
1944
634
1612

Compared With Other Events

Station records per event
Station records in Extreme rain in Japan, 18 to 20 July 2026 compared with similar events
Extreme rain in United States and Mexico, 23 February to 15 March 20192,223 records
Extreme rain in United States, 3 to 19 January 20242,133 records
Extreme rain in Australia, 7 to 26 March 20212,099 records
Extreme rain in United States and Mexico, 29 September to 19 October 20181,970 records
Extreme rain in United States, 19 December 2022 to 13 January 20231,941 records
Extreme rain in Japan, 18 to 20 July 2026 (this event)10 records

Every Record Set

10 of 10
Every record set or tied during Extreme rain in Japan, 18 to 20 July 2026, in date order
DateStationRecordValueMarginYears stoodSignificance
2026-07-18WakamatsuRecord daily precipitation147.5 mm (5.8 in)86.5 mm (3.4 in)5663 of 100 (Major)
2026-07-18KumagayaRecord daily precipitation114.0 mm (4.5 in)55.0 mm (2.2 in)5557 of 100 (Notable)
2026-07-18TateyamaRecord daily precipitation286.5 mm (11.3 in)58.0 mm (2.3 in)038 of 100 (Notable)
2026-07-18ShirakawaRecord daily precipitation106.5 mm (4.2 in)15.6 mm (0.6 in)1220 of 100 (Routine)
2026-07-19KumagayaRecord daily precipitation160.5 mm (6.3 in)104.6 mm (4.1 in)1551 of 100 (Notable)
2026-07-19WakamatsuRecord daily precipitation94.0 mm (3.7 in)42.5 mm (1.7 in)4946 of 100 (Notable)
2026-07-19ChibaRecord daily precipitation104.0 mm (4.1 in)47.1 mm (1.9 in)1234 of 100 (Routine)
2026-07-19TateyamaRecord daily precipitation127.5 mm (5.0 in)62.5 mm (2.5 in)431 of 100 (Routine)
2026-07-20WajimaRecord daily precipitation145.5 mm (5.7 in)76.5 mm (3.0 in)4352 of 100 (Notable)
2026-07-20SuwaRecord daily precipitation73.0 mm (2.9 in)19.0 mm (0.7 in)4431 of 100 (Routine)

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Download the Data

Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-17. Events are found by this site from station records and are not official designations. Records are provisional until reprocessed.