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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, 16 April to 3 May 2018

Heat wave in Japan and 4 other countries, 16 April to 3 May 2018: 201 records at 134 stations, peak on 21 April 2018. Closed.

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

Key Facts

  • Heat wave in Japan and 4 other countries, 16 April to 3 May 2018 set or tied 201 station records at 134 stations.
  • It ran from 16 April 2018 to 3 May 2018 (18 days) and its peak day was 21 April 2018.
  • Status: closed.
  • Preobrazhenie set a daily record high maximum temperature of 23.1 C (73.6 F) on 22 April 2018.
  • The busiest day was 21 April 2018 with 47 records.
  • The oldest broken record in the ranked list had stood for 72 years.

Footprint

16 April to 3 May 2018
Footprint of Heat wave in Japan and 4 other countries, 16 April to 3 May 2018 The area covered by Heat wave in Japan and 4 other countries, 16 April to 3 May 2018 is outlined, with 20 of the stations that set records marked, coloured by record type.
The area covered by Heat wave in Japan and 4 other countries, 16 April to 3 May 2018 is outlined, with 20 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, 16 April to 3 May 2018: stations that set records in the event
StationTypeValueDate
PreobrazhenieRecord high maximum temperature23.1 C (73.6 F)2018-04-22
TroickoeRecord high minimum temperature8.7 C (47.7 F)2018-04-17
GvasjugiRecord high minimum temperature8.3 C (46.9 F)2018-04-20
HikoneRecord high maximum temperature28.3 C (82.9 F)2018-04-21
SendaiRecord high maximum temperature29.9 C (85.8 F)2018-04-22
HiradoRecord high maximum temperature25.1 C (77.2 F)2018-04-22
IshinomakiRecord high maximum temperature28.4 C (83.1 F)2018-04-22
NemuroRecord high minimum temperature3.4 C (38.1 F)2018-04-18
HakodateRecord high minimum temperature8.0 C (46.4 F)2018-04-20
MuroranRecord high maximum temperature22.6 C (72.7 F)2018-04-30
OnahamaRecord high maximum temperature26.1 C (79.0 F)2018-05-01
MelnichnoeRecord high minimum temperature4.4 C (39.9 F)2018-04-21
Veselaja GorkaRecord high minimum temperature6.5 C (43.7 F)2018-04-16
UrmiRecord high minimum temperature2.9 C (37.2 F)2018-04-17
TongheRecord high minimum temperature8.0 C (46.4 F)2018-04-18
Maizuru Reg Met HQRecord high maximum temperature26.5 C (79.7 F)2018-04-19
UenoRecord high maximum temperature28.6 C (83.5 F)2018-04-21
TsuyamaRecord high maximum temperature29.9 C (85.8 F)2018-04-21
ChaoyangRecord high maximum temperature34.1 C (93.4 F)2018-04-28
TomakomaiRecord high minimum temperature7.1 C (44.8 F)2018-04-20

Records per Day

Peak day 47
Records per day during Heat wave in Japan and 4 other countries, 16 April to 3 May 2018 Records set or tied each day from 16 April 2018 to 3 May 2018. The most in one day was 47 on 21 April 2018. 0 13 25 38 50 04-1604-1804-2004-2204-2404-2604-2804-3005-02
Records set or tied each day from 16 April 2018 to 3 May 2018. The most in one day was 47 on 21 April 2018.
Records per day during Heat wave in Japan and 4 other countries, 16 April to 3 May 2018
DateRecords
2018-04-162
2018-04-1711
2018-04-187
2018-04-197
2018-04-2023
2018-04-2147
2018-04-2213
2018-04-238
2018-04-243
2018-04-252
2018-04-261
2018-04-271
2018-04-2811
2018-04-2921
2018-04-3013
2018-05-0120
2018-05-026
2018-05-035

Top Records by Margin

Margin over the record replaced
Top records of Heat wave in Japan and 4 other countries, 16 April to 3 May 2018 ranked by margin
Preobrazhenie, 04-225.5 C (9.9 F)
Veselaja Gorka, 04-165.4 C (9.7 F)
Troickoe, 04-174.8 C (8.6 F)
Hirado, 04-222.7 C (4.9 F)
Chaoyang, 04-282.7 C (4.9 F)
Gvasjugi, 04-202.5 C (4.5 F)
Tsuyama, 04-212.3 C (4.1 F)
Muroran, 04-302.2 C (4.0 F)
Ueno, 04-212.2 C (4.0 F)
Maizuru Reg Met HQ, 04-192.1 C (3.8 F)
Ishinomaki, 04-221.7 C (3.1 F)
Sendai, 04-221.5 C (2.7 F)
Onahama, 05-011.5 C (2.7 F)
Melnichnoe, 04-211.3 C (2.3 F)
Tonghe, 04-181.3 C (2.3 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, 16 April to 3 May 2018 201 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 0.01.53.04.56.0 Margin (C) Years the old record stood
201 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, 16 April to 3 May 2018
Margin (C)Years the old record stood
5.547
1.545
0.153
4.851
2.533
2.753
1.734
0.272
2.256
1.067
1.560
1.360
1.360
2.756
2.253
2.156
2.353
5.432
0.169
0.860
0.963
1.359
1.053
1.256
1.651
1.648
0.845
0.356
1.153
0.360
0.260
0.953
1.452
0.360
2.632
1.120
0.856
0.721
0.356
0.156
0.259
1.944
2.03
2.927
0.156
0.451
0.253
1.148
0.353
0.548
0.551
0.453
0.153
3.928
0.156
0.152
1.144
3.720
0.448
0.945
4.124
0.119
0.152
0.543
0.744
0.148
0.214
3.913
3.628
2.628
2.432
2.23
0.245
0.145
3.78
1.036
1.337
2.719
3.220
1.431
0.536
1.631
2.820
0.836
2.820
0.12
0.635
0.237
1.331
1.331
2.920
0.536
0.435
2.916
2.120
0.131
1.420
0.731
0.12
2.120
2.320
0.432
0.432
0.729
0.127
1.516
0.820
0.335
0.531
0.331
0.131
1.620
1.413
0.628
0.628
1.320
0.128
1.020
1.420
0.220
0.220
0.820
1.020
0.720
2.93
0.128
0.428
0.620
0.123
0.721
1.213
1.513
0.320
0.520
0.225
1.013
0.420
0.621
2.33
1.69
1.75
0.321
0.321
0.220
0.120
0.720
0.913
0.913
0.220
0.220
0.913
2.53
0.221
1.89
0.611
0.613
0.813
0.413
0.813
0.415
0.319
0.99
1.60
2.53
1.19
1.21
0.413
0.612
0.113
0.29
0.68
0.512
1.411
1.44
1.91
0.212
0.211
0.68
0.112
0.19
2.13
0.95
0.19
1.53
0.11
0.83
1.03
1.43
1.63
1.15
1.73
0.73
0.43
0.211
0.83
0.43
0.23
0.63
0.30
0.21

Compared With Other Events

Station records per event
Station records in Heat wave in Japan and 4 other countries, 16 April to 3 May 2018 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, 16 April to 3 May 2018 (this event)201 records

Every Record Set

20 of 201
Every record set or tied during Heat wave in Japan and 4 other countries, 16 April to 3 May 2018, in date order
DateStationRecordValueMarginYears stoodSignificance
2018-04-16Veselaja GorkaRecord high minimum temperature6.5 C (43.7 F)5.4 C (9.7 F)3227 of 100 (Routine)
2018-04-17TroickoeRecord high minimum temperature8.7 C (47.7 F)4.8 C (8.6 F)5132 of 100 (Routine)
2018-04-17UrmiRecord high minimum temperature2.9 C (37.2 F)0.1 C (0.2 F)6927 of 100 (Routine)
2018-04-18NemuroRecord high minimum temperature3.4 C (38.1 F)0.2 C (0.4 F)7229 of 100 (Routine)
2018-04-18TongheRecord high minimum temperature8.0 C (46.4 F)1.3 C (2.3 F)6027 of 100 (Routine)
2018-04-19Maizuru Reg Met HQRecord high maximum temperature26.5 C (79.7 F)2.1 C (3.8 F)5627 of 100 (Routine)
2018-04-20GvasjugiRecord high minimum temperature8.3 C (46.9 F)2.5 C (4.5 F)3332 of 100 (Routine)
2018-04-20HakodateRecord high minimum temperature8.0 C (46.4 F)1.0 C (1.8 F)6729 of 100 (Routine)
2018-04-20TomakomaiRecord high minimum temperature7.1 C (44.8 F)0.8 C (1.4 F)6026 of 100 (Routine)
2018-04-21HikoneRecord high maximum temperature28.3 C (82.9 F)0.1 C (0.2 F)5332 of 100 (Routine)
2018-04-21MelnichnoeRecord high minimum temperature4.4 C (39.9 F)1.3 C (2.3 F)6028 of 100 (Routine)
2018-04-21UenoRecord high maximum temperature28.6 C (83.5 F)2.2 C (4.0 F)5327 of 100 (Routine)
2018-04-21TsuyamaRecord high maximum temperature29.9 C (85.8 F)2.3 C (4.1 F)5327 of 100 (Routine)
2018-04-22PreobrazhenieRecord high maximum temperature23.1 C (73.6 F)5.5 C (9.9 F)4734 of 100 (Routine)
2018-04-22SendaiRecord high maximum temperature29.9 C (85.8 F)1.5 C (2.7 F)4532 of 100 (Routine)
2018-04-22HiradoRecord high maximum temperature25.1 C (77.2 F)2.7 C (4.9 F)5331 of 100 (Routine)
2018-04-22IshinomakiRecord high maximum temperature28.4 C (83.1 F)1.7 C (3.1 F)3430 of 100 (Routine)
2018-04-28ChaoyangRecord high maximum temperature34.1 C (93.4 F)2.7 C (4.9 F)5627 of 100 (Routine)
2018-04-30MuroranRecord high maximum temperature22.6 C (72.7 F)2.2 C (4.0 F)5629 of 100 (Routine)
2018-05-01OnahamaRecord high maximum temperature26.1 C (79.0 F)1.5 C (2.7 F)6029 of 100 (Routine)

The daily ledgers keep a limited number of records per day, so this list has 20 of the 201 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.