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

Heat wave in Japan and 4 other countries, 20 July to 17 August 2019

Heat wave in Japan and 4 other countries, 20 July to 17 August 2019: 448 records at 133 stations, peak on 14 August 2019. Closed.

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

Key Facts

  • Heat wave in Japan and 4 other countries, 20 July to 17 August 2019 set or tied 448 station records at 133 stations.
  • It ran from 20 July 2019 to 17 August 2019 (29 days) and its peak day was 14 August 2019.
  • Status: closed.
  • Morioka set an all-time record high minimum temperature of 25.2 C (77.4 F) on 29 July 2019.
  • The busiest day was 13 August 2019 with 38 records.
  • The oldest broken record in the ranked list had stood for 68 years.

Footprint

20 July to 17 August 2019
Footprint of Heat wave in Japan and 4 other countries, 20 July to 17 August 2019 The area covered by Heat wave in Japan and 4 other countries, 20 July to 17 August 2019 is outlined, with 17 of the stations that set records marked, coloured by record type.
The area covered by Heat wave in Japan and 4 other countries, 20 July to 17 August 2019 is outlined, with 17 of the stations that set records marked, coloured by record type. Made with Natural Earth.
Footprint of Heat wave in Japan and 4 other countries, 20 July to 17 August 2019: stations that set records in the event
StationTypeValueDate
MoriokaRecord high minimum temperature25.2 C (77.4 F)2019-07-29
HimejiRecord high minimum temperature28.7 C (83.7 F)2019-08-13
TakadaRecord high minimum temperature30.3 C (86.5 F)2019-08-15
AkitaRecord high minimum temperature28.7 C (83.7 F)2019-08-15
NiigataRecord high minimum temperature28.8 C (83.8 F)2019-08-14
ShinjoRecord high minimum temperature26.1 C (79.0 F)2019-08-15
TomakomaiRecord high maximum temperature30.6 C (87.1 F)2019-07-30
TakayamaRecord high maximum temperature37.7 C (99.9 F)2019-08-13
NaganoRecord high minimum temperature27.2 C (81.0 F)2019-08-14
YakushimaRecord high minimum temperature26.8 C (80.2 F)2019-08-11
OtaruRecord high minimum temperature23.9 C (75.0 F)2019-07-31
OwaseRecord high minimum temperature27.2 C (81.0 F)2019-08-13
Kimchaek/SongjinRecord high minimum temperature24.8 C (76.6 F)2019-07-30
NaraRecord high minimum temperature26.8 C (80.2 F)2019-08-02
TateyamaRecord high minimum temperature27.9 C (82.2 F)2019-08-15
SuttsuRecord high minimum temperature23.5 C (74.3 F)2019-07-30
OnahamaRecord high minimum temperature25.2 C (77.4 F)2019-08-13

Records per Day

Peak day 38
Records per day during Heat wave in Japan and 4 other countries, 20 July to 17 August 2019 Records set or tied each day from 20 July 2019 to 17 August 2019. The most in one day was 38 on 13 August 2019. 0 10 20 30 40 07-2007-2407-2707-3008-0208-0508-0808-1108-1408-17
Records set or tied each day from 20 July 2019 to 17 August 2019. The most in one day was 38 on 13 August 2019.
Records per day during Heat wave in Japan and 4 other countries, 20 July to 17 August 2019
DateRecords
2019-07-202
2019-07-212
2019-07-223
2019-07-245
2019-07-254
2019-07-263
2019-07-275
2019-07-2811
2019-07-2921
2019-07-3036
2019-07-3128
2019-08-0117
2019-08-0222
2019-08-039
2019-08-0411
2019-08-0513
2019-08-0621
2019-08-0719
2019-08-0818
2019-08-0923
2019-08-1016
2019-08-1112
2019-08-1228
2019-08-1338
2019-08-1438
2019-08-1528
2019-08-165
2019-08-1710

Top Records by Margin

Margin over the record replaced
Top records of Heat wave in Japan and 4 other countries, 20 July to 17 August 2019 ranked by margin
Kimchaek/Songjin, 07-302.8 C (5.0 F)
Otaru, 07-311.7 C (3.1 F)
Takayama, 08-121.6 C (2.9 F)
Himeji, 08-131.2 C (2.2 F)
Akita, 08-151.2 C (2.2 F)
Yakushima, 08-111.2 C (2.2 F)
Takada, 08-150.9 C (1.6 F)
Takada, 08-140.8 C (1.4 F)
Onahama, 08-130.8 C (1.4 F)
Owase, 08-130.6 C (1.1 F)
Tateyama, 08-150.6 C (1.1 F)
Takayama, 08-010.6 C (1.1 F)
Shinjo, 08-150.5 C (0.9 F)
Suttsu, 07-300.5 C (0.9 F)
Niigata, 08-140.4 C (0.7 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 and 4 other countries, 20 July to 17 August 2019 448 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 20 40 60 80 0.00.81.52.33.0 Margin (C) Years the old record stood
448 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 and 4 other countries, 20 July to 17 August 2019
Margin (C)Years the old record stood
0.361
0.951
1.246
1.235
0.441
0.535
0.467
0.825
0.228
0.425
1.262
1.765
1.658
0.65
0.611
0.212
2.841
0.543
0.864
0.60
1.652
0.142
0.38
1.657
0.864
0.568
0.26
0.50
1.060
0.860
0.366
0.668
1.057
0.141
0.30
0.40
1.352
0.568
0.662
1.154
0.364
0.664
0.960
0.464
0.854
0.10
0.758
0.461
0.660
0.560
0.166
0.952
0.753
1.942
0.560
0.857
0.660
1.545
2.936
0.856
0.656
0.857
0.956
0.652
0.132
0.164
0.658
1.048
0.164
0.160
2.434
0.557
0.162
0.753
2.634
0.358
0.752
1.534
0.358
0.160
0.260
0.948
1.548
0.356
0.156
0.157
0.553
0.454
1.634
0.156
0.852
1.434
0.352
1.720
0.648
0.254
0.752
0.552
0.158
0.156
0.552
0.649
0.252
0.252
0.548
0.745
1.045
0.744
0.144
0.119
0.740
0.68
0.844
1.824
0.152
0.349
0.252
0.449
0.645
0.352
0.248
0.248
0.148
1.134
1.033
1.336
0.152
0.934
0.540
0.933
0.932
0.152
0.248
0.249
1.132
0.149
0.148
1.328
0.445
0.641
0.144
1.31
0.736
0.58
0.737
1.134
0.144
0.440
2.124
0.634
0.333
0.632
0.340
0.245
0.440
0.340
0.921
1.620
1.624
0.536
0.240
0.70
0.140
0.344
0.930
0.340
0.140
0.836
0.633
0.436
1.320
1.88
1.412
0.532
0.436
0.437
0.437
0.141
0.534
0.534
0.137
1.332
0.433
0.333
0.432
0.730
0.628
0.240
0.533
0.824
0.628
1.417
0.637
0.136
0.11
0.234
0.133
0.134
0.920
0.824

Compared With Other Events

Station records per event
Station records in Heat wave in Japan and 4 other countries, 20 July to 17 August 2019 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 and 4 other countries, 20 July to 17 August 2019 (this event)448 records

Every Record Set

20 of 448
Every record set or tied during Heat wave in Japan and 4 other countries, 20 July to 17 August 2019, in date order
DateStationRecordValueMarginYears stoodSignificance
2019-07-29MoriokaRecord high minimum temperature25.2 C (77.4 F)0.3 C (0.5 F)6145 of 100 (Notable)
2019-07-30TomakomaiRecord high maximum temperature30.6 C (87.1 F)0.4 C (0.7 F)6737 of 100 (Notable)
2019-07-30Kimchaek/SongjinRecord high minimum temperature24.8 C (76.6 F)2.8 C (5.0 F)4130 of 100 (Routine)
2019-07-30SuttsuRecord high minimum temperature23.5 C (74.3 F)0.5 C (0.9 F)4329 of 100 (Routine)
2019-07-31OtaruRecord high minimum temperature23.9 C (75.0 F)1.7 C (3.1 F)6531 of 100 (Routine)
2019-08-01TakayamaRecord high minimum temperature23.7 C (74.7 F)0.6 C (1.1 F)029 of 100 (Routine)
2019-08-02NaraRecord high minimum temperature26.8 C (80.2 F)0.2 C (0.4 F)1230 of 100 (Routine)
2019-08-11YakushimaRecord high minimum temperature26.8 C (80.2 F)1.2 C (2.2 F)6233 of 100 (Routine)
2019-08-12TakayamaRecord high minimum temperature23.4 C (74.1 F)1.6 C (2.9 F)5831 of 100 (Routine)
2019-08-13HimejiRecord high minimum temperature28.7 C (83.7 F)1.2 C (2.2 F)4645 of 100 (Notable)
2019-08-13TakayamaRecord high maximum temperature37.7 C (99.9 F)0.4 C (0.7 F)2534 of 100 (Routine)
2019-08-13OwaseRecord high minimum temperature27.2 C (81.0 F)0.6 C (1.1 F)531 of 100 (Routine)
2019-08-13OnahamaRecord high minimum temperature25.2 C (77.4 F)0.8 C (1.4 F)6429 of 100 (Routine)
2019-08-14NiigataRecord high minimum temperature28.8 C (83.8 F)0.4 C (0.7 F)4139 of 100 (Notable)
2019-08-14TakadaRecord high maximum temperature40.3 C (104.5 F)0.8 C (1.4 F)2535 of 100 (Notable)
2019-08-14NaganoRecord high minimum temperature27.2 C (81.0 F)0.2 C (0.4 F)2834 of 100 (Routine)
2019-08-15TakadaRecord high minimum temperature30.3 C (86.5 F)0.9 C (1.6 F)5145 of 100 (Notable)
2019-08-15AkitaRecord high minimum temperature28.7 C (83.7 F)1.2 C (2.2 F)3540 of 100 (Notable)
2019-08-15ShinjoRecord high minimum temperature26.1 C (79.0 F)0.5 C (0.9 F)3538 of 100 (Notable)
2019-08-15TateyamaRecord high minimum temperature27.9 C (82.2 F)0.6 C (1.1 F)1130 of 100 (Routine)

The daily ledgers keep a limited number of records per day, so this list has 20 of the 448 records the event counts. The counts above use the full total.

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.