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Built 2026-10-19 (19 October 2026)

Heat wave in Japan and Korea, South, 21 to 31 August 2018

Heat wave in Japan and Korea, South, 21 to 31 August 2018: 211 records at 88 stations, peak on 26 August 2018. Closed.

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

Key Facts

  • Heat wave in Japan and Korea, South, 21 to 31 August 2018 set or tied 211 station records at 88 stations.
  • It ran from 21 August 2018 to 31 August 2018 (11 days) and its peak day was 26 August 2018.
  • Status: closed.
  • Fukuyama set an all-time record high minimum temperature of 27.6 C (81.7 F) on 22 August 2018.
  • The busiest day was 22 August 2018 with 34 records.
  • The oldest broken record in the ranked list had stood for 71 years.

Footprint

21 to 31 August 2018
Footprint of Heat wave in Japan and Korea, South, 21 to 31 August 2018 The area covered by Heat wave in Japan and Korea, South, 21 to 31 August 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 Korea, South, 21 to 31 August 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 Korea, South, 21 to 31 August 2018: stations that set records in the event
StationTypeValueDate
FukuyamaRecord high minimum temperature27.6 C (81.7 F)2018-08-22
NiigataRecord high maximum temperature39.9 C (103.8 F)2018-08-23
MitoRecord high minimum temperature27.0 C (80.6 F)2018-08-24
SakaiRecord high maximum temperature38.5 C (101.3 F)2018-08-22
WakamatsuRecord high maximum temperature38.5 C (101.3 F)2018-08-23
YamagataRecord high maximum temperature39.0 C (102.2 F)2018-08-23
AkitaRecord high maximum temperature37.6 C (99.7 F)2018-08-23
MatsuyamaRecord high maximum temperature36.9 C (98.4 F)2018-08-25
ChoshiRecord high maximum temperature33.1 C (91.6 F)2018-08-26
HamadaRecord high maximum temperature37.4 C (99.3 F)2018-08-22
MokpoRecord high minimum temperature26.2 C (79.2 F)2018-08-30
IrozakiRecord high minimum temperature26.7 C (80.1 F)2018-08-25
TsuRecord high maximum temperature36.7 C (98.1 F)2018-08-26
OmaezakiRecord high minimum temperature26.3 C (79.3 F)2018-08-29
KanazawaRecord high maximum temperature36.6 C (97.9 F)2018-08-24
NikkoRecord high minimum temperature19.4 C (66.9 F)2018-08-24
KaruizawaRecord high minimum temperature20.6 C (69.1 F)2018-08-25
HamamatsuRecord high maximum temperature35.8 C (96.4 F)2018-08-26
IrakoRecord high maximum temperature35.3 C (95.5 F)2018-08-27
AikawaRecord high maximum temperature37.8 C (100.0 F)2018-08-23

Records per Day

Peak day 34
Records per day during Heat wave in Japan and Korea, South, 21 to 31 August 2018 Records set or tied each day from 21 August 2018 to 31 August 2018. The most in one day was 34 on 22 August 2018. 0 10 20 30 40 08-2108-2308-2508-2708-2908-31
Records set or tied each day from 21 August 2018 to 31 August 2018. The most in one day was 34 on 22 August 2018.
Records per day during Heat wave in Japan and Korea, South, 21 to 31 August 2018
DateRecords
2018-08-2118
2018-08-2234
2018-08-2327
2018-08-2425
2018-08-2528
2018-08-2634
2018-08-2714
2018-08-288
2018-08-297
2018-08-307
2018-08-319

Top Records by Margin

Margin over the record replaced
Top records of Heat wave in Japan and Korea, South, 21 to 31 August 2018 ranked by margin
Akita, 08-233.5 C (6.3 F)
Hamada, 08-222.6 C (4.7 F)
Matsuyama, 08-252.2 C (4.0 F)
Karuizawa, 08-251.7 C (3.1 F)
Nikko, 08-241.6 C (2.9 F)
Niigata, 08-231.4 C (2.5 F)
Tsu, 08-261.2 C (2.2 F)
Omaezaki, 08-290.9 C (1.6 F)
Mokpo, 08-300.8 C (1.4 F)
Irako, 08-270.8 C (1.4 F)
Hamamatsu, 08-260.7 C (1.3 F)
Choshi, 08-260.6 C (1.1 F)
Kanazawa, 08-240.6 C (1.1 F)
Irozaki, 08-250.5 C (0.9 F)
Fukuyama, 08-220.4 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 Korea, South, 21 to 31 August 2018 211 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 0.01.02.03.04.0 Margin (C) Years the old record stood
211 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 Korea, South, 21 to 31 August 2018
Margin (C)Years the old record stood
0.461
1.440
0.340
0.424
0.424
0.124
3.548
0.671
2.251
2.648
0.859
1.265
0.956
0.567
0.667
1.752
0.865
0.765
1.651
0.40
0.756
0.30
0.564
0.665
0.365
0.465
0.563
0.853
1.052
0.360
0.460
2.343
0.757
0.356
0.560
0.656
0.753
0.360
2.832
0.424
0.453
0.256
0.257
0.453
0.253
1.136
0.647
0.153
1.139
1.144
0.745
0.151
1.232
1.236
0.639
2.223
1.035
1.324
0.832
3.211
0.639
1.032
1.131
1.528
1.229
0.244
2.323
0.240
1.027
1.923
1.228
0.140
0.829
1.228
0.629
0.333
0.529
0.241
2.213
1.423
0.439
1.823
0.133
0.923
0.628
0.529
1.323
1.723
1.120
0.232
0.331
2.75
1.323
1.023
0.229
0.923
1.111
1.012
0.232
2.00
0.327
0.923
0.523
1.35
0.723
0.723
0.424
0.624
0.723
0.224
0.824
0.623
0.423
0.623
0.523
1.75
0.523
0.916
0.523
0.323
2.05
1.311
0.423
0.323
1.08
0.523
0.123
0.223
0.123
0.317
1.48
1.51
0.811
1.08
0.123
0.123
0.417
0.325
0.117
1.28
0.615
0.117
0.64
1.35
0.317
0.217
1.55
0.58
0.219
0.88
0.88
1.35
0.88
1.25
0.48
1.05
0.81
1.10
0.58
0.68
1.05
1.05
0.64
1.05
0.311
0.38
0.38
0.55
0.70
0.211
0.58
0.38
0.111
0.38
0.38
0.38
0.58
1.00
0.91
0.48
0.28
0.54
1.21
0.216
0.217
0.38
0.18
0.44
0.54
0.18
0.40
0.70
0.80
0.38
0.54
0.18
0.18
0.18
0.41
0.70

Compared With Other Events

Station records per event
Station records in Heat wave in Japan and Korea, South, 21 to 31 August 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 Korea, South, 21 to 31 August 2018 (this event)211 records

Every Record Set

20 of 211
Every record set or tied during Heat wave in Japan and Korea, South, 21 to 31 August 2018, in date order
DateStationRecordValueMarginYears stoodSignificance
2018-08-22FukuyamaRecord high minimum temperature27.6 C (81.7 F)0.4 C (0.7 F)6146 of 100 (Notable)
2018-08-22SakaiRecord high maximum temperature38.5 C (101.3 F)0.4 C (0.7 F)2434 of 100 (Routine)
2018-08-22HamadaRecord high maximum temperature37.4 C (99.3 F)2.6 C (4.7 F)4830 of 100 (Routine)
2018-08-23NiigataRecord high maximum temperature39.9 C (103.8 F)1.4 C (2.5 F)4042 of 100 (Notable)
2018-08-23WakamatsuRecord high maximum temperature38.5 C (101.3 F)0.4 C (0.7 F)2434 of 100 (Routine)
2018-08-23YamagataRecord high maximum temperature39.0 C (102.2 F)0.1 C (0.2 F)2433 of 100 (Routine)
2018-08-23AkitaRecord high maximum temperature37.6 C (99.7 F)3.5 C (6.3 F)4831 of 100 (Routine)
2018-08-23AikawaRecord high maximum temperature37.8 C (100.0 F)0.4 C (0.7 F)027 of 100 (Routine)
2018-08-24MitoRecord high minimum temperature27.0 C (80.6 F)0.3 C (0.5 F)4039 of 100 (Notable)
2018-08-24KanazawaRecord high maximum temperature36.6 C (97.9 F)0.6 C (1.1 F)6728 of 100 (Routine)
2018-08-24NikkoRecord high minimum temperature19.4 C (66.9 F)1.6 C (2.9 F)5128 of 100 (Routine)
2018-08-25MatsuyamaRecord high maximum temperature36.9 C (98.4 F)2.2 C (4.0 F)5131 of 100 (Routine)
2018-08-25IrozakiRecord high minimum temperature26.7 C (80.1 F)0.5 C (0.9 F)6729 of 100 (Routine)
2018-08-25KaruizawaRecord high minimum temperature20.6 C (69.1 F)1.7 C (3.1 F)5228 of 100 (Routine)
2018-08-26ChoshiRecord high maximum temperature33.1 C (91.6 F)0.6 C (1.1 F)7131 of 100 (Routine)
2018-08-26TsuRecord high maximum temperature36.7 C (98.1 F)1.2 C (2.2 F)6529 of 100 (Routine)
2018-08-26HamamatsuRecord high maximum temperature35.8 C (96.4 F)0.7 C (1.3 F)6528 of 100 (Routine)
2018-08-27IrakoRecord high maximum temperature35.3 C (95.5 F)0.8 C (1.4 F)6528 of 100 (Routine)
2018-08-29OmaezakiRecord high minimum temperature26.3 C (79.3 F)0.9 C (1.6 F)5629 of 100 (Routine)
2018-08-30MokpoRecord high minimum temperature26.2 C (79.2 F)0.8 C (1.4 F)5930 of 100 (Routine)

The daily ledgers keep a limited number of records per day, so this list has 20 of the 211 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.