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Built 2026-10-19 (19 October 2026)

Heat wave in Japan, 11 to 13 September 2026

Heat wave in Japan, 11 to 13 September 2026: 9 records at 8 stations, peak on 12 September 2026. Closed.

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

Key Facts

  • Heat wave in Japan, 11 to 13 September 2026 set or tied 9 station records at 8 stations.
  • It ran from 11 September 2026 to 13 September 2026 (3 days) and its peak day was 12 September 2026.
  • Status: closed.
  • Hita set a daily record high minimum temperature of 24.9 C (76.8 F) on 12 September 2026 (provisional).
  • The busiest day was 12 September 2026 with 6 records.
  • The oldest broken record in the ranked list had stood for 49 years.

Footprint

11 to 13 September 2026
Footprint of Heat wave in Japan, 11 to 13 September 2026 The area covered by Heat wave in Japan, 11 to 13 September 2026 is outlined, with 8 of the stations that set records marked, coloured by record type.
The area covered by Heat wave in Japan, 11 to 13 September 2026 is outlined, with 8 of the stations that set records marked, coloured by record type. Made with Natural Earth.
Footprint of Heat wave in Japan, 11 to 13 September 2026: stations that set records in the event
StationTypeValueDate
HitoyoshiRecord high minimum temperature23.6 C (74.5 F)2026-09-12
HitaRecord high minimum temperature24.9 C (76.8 F)2026-09-12
SaigoRecord high minimum temperature24.9 C (76.8 F)2026-09-12
YamaguchiRecord high minimum temperature25.2 C (77.4 F)2026-09-12
NaraRecord high minimum temperature24.1 C (75.4 F)2026-09-12
SumotoRecord high minimum temperature25.9 C (78.6 F)2026-09-13
ShimonosekiRecord high minimum temperature25.8 C (78.4 F)2026-09-12
KanazawaRecord high minimum temperature25.1 C (77.2 F)2026-09-13
KyotoRecord high minimum temperature25.6 C (78.1 F)2026-09-12

Records per Day

Peak day 6
Records per day during Heat wave in Japan, 11 to 13 September 2026 Records set or tied each day from 11 September 2026 to 13 September 2026. The most in one day was 6 on 12 September 2026. 0 2 3 5 6 09-1109-1209-13
Records set or tied each day from 11 September 2026 to 13 September 2026. The most in one day was 6 on 12 September 2026.
Records per day during Heat wave in Japan, 11 to 13 September 2026
DateRecords
2026-09-111
2026-09-126
2026-09-132

Top Records by Margin

Margin over the record replaced
Top records of Heat wave in Japan, 11 to 13 September 2026 ranked by margin
Yamaguchi, 09-121.1 C (2.0 F)
Sumoto, 09-131.1 C (2.0 F)
Hitoyoshi, 09-110.9 C (1.6 F)
Saigo, 09-120.8 C (1.4 F)
Hitoyoshi, 09-120.5 C (0.9 F)
Kanazawa, 09-130.5 C (0.9 F)
Hita, 09-120.4 C (0.7 F)
Shimonoseki, 09-120.2 C (0.4 F)
Nara, 09-120.1 C (0.2 F)

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 Heat wave in Japan, 11 to 13 September 2026 9 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 13 25 38 50 0.00.30.60.91.2 Margin (C) Years the old record stood
9 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 Heat wave in Japan, 11 to 13 September 2026
Margin (C)Years the old record stood
0.449
0.549
0.823
1.123
0.923
1.10
0.116
0.50
0.24

Compared With Other Events

Station records per event
Station records in Heat wave in Japan, 11 to 13 September 2026 compared with similar events
Heat wave in United States and Mexico, 16 January to 14 February 20249,869 records
Heat wave in United States, 28 January to 24 February 20266,528 records
Heat wave in United States and Mexico, 24 May to 19 June 20205,047 records
Heat wave in United States and Mexico, 26 March to 17 April 20213,669 records
Heat wave in Germany and 49 other countries, 18 December 2021 to 15 January 20223,626 records
Heat wave in Japan, 11 to 13 September 2026 (this event)9 records

Every Record Set

10 of 9
Every record set or tied during Heat wave in Japan, 11 to 13 September 2026, in date order
DateStationRecordValueMarginYears stoodSignificance
2026-09-11HitoyoshiRecord high minimum temperature (provisional)24.4 C (75.9 F)0.9 C (1.6 F)2315 of 100 (Routine)
2026-09-12HitaRecord high minimum temperature (provisional)24.9 C (76.8 F)0.4 C (0.7 F)4922 of 100 (Routine)
2026-09-12HitoyoshiRecord high minimum temperature (provisional)23.6 C (74.5 F)0.5 C (0.9 F)4922 of 100 (Routine)
2026-09-12SaigoRecord high minimum temperature (provisional)24.9 C (76.8 F)0.8 C (1.4 F)2315 of 100 (Routine)
2026-09-12YamaguchiRecord high minimum temperature (provisional)25.2 C (77.4 F)1.1 C (2.0 F)2315 of 100 (Routine)
2026-09-12NaraRecord high minimum temperature (provisional)24.1 C (75.4 F)0.1 C (0.2 F)1611 of 100 (Routine)
2026-09-12ShimonosekiRecord high minimum temperature (provisional)25.8 C (78.4 F)0.2 C (0.4 F)48 of 100 (Routine)
2026-09-12KyotoRecord high minimum temperature (tie) (provisional)25.6 C (78.1 F)tie162 of 100 (Routine)
2026-09-13SumotoRecord high minimum temperature (provisional)25.9 C (78.6 F)1.1 C (2.0 F)011 of 100 (Routine)
2026-09-13KanazawaRecord high minimum temperature (provisional)25.1 C (77.2 F)0.5 C (0.9 F)08 of 100 (Routine)

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.