Heat wave in Japan and 5 other countries, 27 May to 21 June 2020

Name: Heat wave in Japan and 5 other countries, 27 May to 21 June 2020
Start: 2020-05-27
End: 2020-06-21
Location: Japan, China, Russia, Korea, South, Korea, North, Mongolia

Heat wave in Japan and 5 other countries, 27 May to 21 June 2020: 673 records at 261 stations, peak on 10 June 2020. Closed.

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

Key Facts

Heat wave in Japan and 5 other countries, 27 May to 21 June 2020 set or tied 673 station records at 261 stations.
It ran from 27 May 2020 to 21 June 2020 (26 days) and its peak day was 10 June 2020.
Status: closed.
Poset set a daily record high minimum temperature of 19.5 C (67.1 F) on 11 June 2020.
The busiest day was 10 June 2020 with 75 records.
The oldest broken record in the ranked list had stood for 88 years.

Footprint

27 May to 21 June 2020

The area covered by Heat wave in Japan and 5 other countries, 27 May to 21 June 2020 is outlined, with 19 of the stations that set records marked, coloured by record type. Made with Natural Earth.

Footprint of Heat wave in Japan and 5 other countries, 27 May to 21 June 2020: stations that set records in the event
Station	Type	Value	Date
Poset	Record high minimum temperature	19.5 C (67.1 F)	2020-06-11
Mokpo	Record high minimum temperature	21.8 C (71.2 F)	2020-06-13
Onahama	Record high maximum temperature	32.6 C (90.7 F)	2020-06-15
Juzhno-Kurilsk	Record high minimum temperature	12.4 C (54.3 F)	2020-06-12
Aikawa	Record high minimum temperature	21.0 C (69.8 F)	2020-06-10
Yinchuan	Record high maximum temperature	36.3 C (97.3 F)	2020-06-05
Owase	Record high minimum temperature	23.6 C (74.5 F)	2020-06-14
Ofunato	Record high maximum temperature	33.1 C (91.6 F)	2020-06-10
Hamamatsu	Record high minimum temperature	23.4 C (74.1 F)	2020-06-14
Kitamiesashi	Record high minimum temperature	16.4 C (61.5 F)	2020-05-30
Arhara	Record high maximum temperature	31.2 C (88.2 F)	2020-05-30
Choshi	Record high minimum temperature	21.0 C (69.8 F)	2020-06-05
Ternej	Record high minimum temperature	15.4 C (59.7 F)	2020-06-12
Makurazaki	Record high minimum temperature	24.6 C (76.3 F)	2020-06-13
Juzhno-Sahalinsk	Record high maximum temperature	29.4 C (84.9 F)	2020-05-30
Tianjin	Record high minimum temperature	25.0 C (77.0 F)	2020-06-08
Tottori	Record high minimum temperature	23.5 C (74.3 F)	2020-06-10
Timiryazevskij	Record high minimum temperature	17.0 C (62.6 F)	2020-06-13
Yakushima	Record high maximum temperature	33.6 C (92.5 F)	2020-06-18

Records per Day

Peak day 75

Records set or tied each day from 27 May 2020 to 21 June 2020. The most in one day was 75 on 10 June 2020.

Records per day during Heat wave in Japan and 5 other countries, 27 May to 21 June 2020
Date	Records
2020-05-27	1
2020-05-28	3
2020-05-29	10
2020-05-30	31
2020-05-31	19
2020-06-01	10
2020-06-02	8
2020-06-03	21
2020-06-04	31
2020-06-05	42
2020-06-06	38
2020-06-07	40
2020-06-08	34
2020-06-09	46
2020-06-10	75
2020-06-11	46
2020-06-12	60
2020-06-13	62
2020-06-14	49
2020-06-15	31
2020-06-16	6
2020-06-17	3
2020-06-18	3
2020-06-19	2
2020-06-20	1
2020-06-21	1

Top Records by Margin

Margin over the record replaced

Top records of Heat wave in Japan and 5 other countries, 27 May to 21 June 2020 ranked by margin
Ofunato, 06-10	4.7 C (8.5 F)
Poset, 06-11	4.0 C (7.2 F)
Onahama, 06-15	4.0 C (7.2 F)
Ternej, 06-12	3.8 C (6.8 F)
Juzhno-Sahalinsk, 05-30	3.7 C (6.7 F)
Tottori, 06-10	3.3 C (5.9 F)
Makurazaki, 06-13	2.8 C (5.0 F)
Yinchuan, 06-05	2.7 C (4.9 F)
Owase, 06-14	2.7 C (4.9 F)
Hamamatsu, 06-14	2.7 C (4.9 F)
Aikawa, 06-10	2.6 C (4.7 F)
Yakushima, 06-18	2.5 C (4.5 F)
Juzhno-Kurilsk, 06-12	2.2 C (4.0 F)
Tianjin, 06-08	1.8 C (3.2 F)
Choshi, 06-05	1.5 C (2.7 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

500 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 5 other countries, 27 May to 21 June 2020
Margin (C)	Years the old record stood
4.0	74
1.3	88
4.0	64
2.2	70
2.6	65
2.7	68
2.7	58
4.7	55
2.7	50
0.3	54
1.5	59
2.8	58
0.6	72
1.4	77
3.8	34
1.8	64
3.3	49
2.5	57
0.6	68
3.7	63
2.3	60
1.6	64
2.6	50
3.5	36
1.9	71
2.5	42
1.4	58
1.5	58
1.0	68
3.9	42
3.0	42
1.0	64
1.0	64
4.9	22
0.8	69
1.2	64
2.0	55
0.5	69
1.4	61
0.4	68
1.7	65
0.3	6
1.2	65
2.1	58
2.6	51
2.8	51
2.5	42
1.5	48
1.1	59
1.0	59
2.3	38
3.1	27
1.2	63
4.1	36
0.2	68
0.4	64
0.2	69
0.9	58
3.3	34
0.2	68
0.5	64
2.5	48
3.1	39
0.2	67
2.7	40
1.7	53
0.5	69
1.3	64
0.8	65
0.9	62
1.8	53
2.1	53
1.7	52
1.1	58
2.1	53
0.6	58
1.6	50
0.1	64
2.2	48
1.3	49
2.6	30
2.6	42
1.8	43
0.1	64
1.4	49
0.1	65
2.7	27
4.2	42
1.8	40
3.0	43
1.2	62
1.4	44
1.1	59
0.1	66
0.5	62
2.7	42
2.8	46
0.2	60
0.1	64
0.2	64
0.3	63
2.1	36
0.7	58
1.0	50
2.3	39
2.2	42
1.3	49
1.8	49
1.6	49
1.8	40
1.8	40
1.7	43
1.7	43
2.8	27
2.7	27
0.1	64
1.0	53
1.1	42
2.5	40
1.5	53
0.7	54
0.9	59
2.1	48
1.5	43
0.8	52
0.9	48
1.4	42
2.2	30
0.3	58
1.0	49
2.5	42
1.8	42
2.0	42
0.3	55
1.7	42
0.1	59
2.1	29
1.5	43
1.1	44
1.5	42
2.0	41
2.0	27
0.9	49
0.9	49
1.4	40
0.6	50
1.6	40
2.1	29
0.6	56
0.6	50
0.6	52
0.7	52
1.8	36
0.4	52
2.1	42
1.0	45
1.3	43
0.4	52
0.8	49
1.6	49
1.4	49
0.5	49
1.4	42
1.3	49
0.8	44
0.3	53
1.5	42
3.9	17
1.2	45
0.5	49
2.2	27
4.3	10
0.5	48
3.0	28
1.5	42
0.2	53
3.0	34
5.8	10
0.1	52
0.2	52
0.6	51
0.4	51
1.4	43
1.2	43
1.0	42
0.6	44
1.0	42
0.9	40
0.5	49
1.6	32
2.3	24
0.8	40
0.2	51
0.3	49
2.2	18
0.3	48
0.6	49
0.8	42
2.2	27
2.1	27

Compared With Other Events

Station records per event

Station records in Heat wave in Japan and 5 other countries, 27 May to 21 June 2020 compared with similar events
Heat wave in United States and Mexico, 16 January to 14 February 2024	9,869 records
Heat wave in United States, 28 January to 24 February 2026	6,528 records
Heat wave in United States and Mexico, 24 May to 19 June 2020	5,047 records
Heat wave in United States and Mexico, 26 March to 17 April 2021	3,669 records
Heat wave in Germany and 49 other countries, 18 December 2021 to 15 January 2022	3,626 records
Heat wave in Japan and 5 other countries, 27 May to 21 June 2020 (this event)	673 records

Every Record Set

20 of 673

Every record set or tied during Heat wave in Japan and 5 other countries, 27 May to 21 June 2020, in date order
Date	Station	Record	Value	Margin	Years stood	Significance
2020-05-30	Kitamiesashi	Record high minimum temperature	16.4 C (61.5 F)	0.3 C (0.5 F)	54	33 of 100 (Routine)
2020-05-30	Arhara	Record high maximum temperature	31.2 C (88.2 F)	1.4 C (2.5 F)	77	33 of 100 (Routine)
2020-05-30	Juzhno-Sahalinsk	Record high maximum temperature	29.4 C (84.9 F)	3.7 C (6.7 F)	63	32 of 100 (Routine)
2020-06-05	Yinchuan	Record high maximum temperature	36.3 C (97.3 F)	2.7 C (4.9 F)	68	35 of 100 (Notable)
2020-06-05	Choshi	Record high minimum temperature	21.0 C (69.8 F)	1.5 C (2.7 F)	59	33 of 100 (Routine)
2020-06-08	Tianjin	Record high minimum temperature	25.0 C (77.0 F)	1.8 C (3.2 F)	64	32 of 100 (Routine)
2020-06-10	Aikawa	Record high minimum temperature	21.0 C (69.8 F)	2.6 C (4.7 F)	65	36 of 100 (Notable)
2020-06-10	Ofunato	Record high maximum temperature	33.1 C (91.6 F)	4.7 C (8.5 F)	55	34 of 100 (Routine)
2020-06-10	Tottori	Record high minimum temperature	23.5 C (74.3 F)	3.3 C (5.9 F)	49	32 of 100 (Routine)
2020-06-11	Poset	Record high minimum temperature	19.5 C (67.1 F)	4.0 C (7.2 F)	74	45 of 100 (Notable)
2020-06-12	Juzhno-Kurilsk	Record high minimum temperature	12.4 C (54.3 F)	2.2 C (4.0 F)	70	38 of 100 (Notable)
2020-06-12	Mokpo	Record high minimum temperature	21.1 C (70.0 F)	0.6 C (1.1 F)	72	33 of 100 (Routine)
2020-06-12	Ternej	Record high minimum temperature	15.4 C (59.7 F)	3.8 C (6.8 F)	34	33 of 100 (Routine)
2020-06-13	Mokpo	Record high minimum temperature	21.8 C (71.2 F)	1.3 C (2.3 F)	88	41 of 100 (Notable)
2020-06-13	Makurazaki	Record high minimum temperature	24.6 C (76.3 F)	2.8 C (5.0 F)	58	33 of 100 (Routine)
2020-06-13	Timiryazevskij	Record high minimum temperature	17.0 C (62.6 F)	0.6 C (1.1 F)	68	32 of 100 (Routine)
2020-06-14	Owase	Record high minimum temperature	23.6 C (74.5 F)	2.7 C (4.9 F)	58	35 of 100 (Notable)
2020-06-14	Hamamatsu	Record high minimum temperature	23.4 C (74.1 F)	2.7 C (4.9 F)	50	34 of 100 (Routine)
2020-06-15	Onahama	Record high maximum temperature	32.6 C (90.7 F)	4.0 C (7.2 F)	64	39 of 100 (Notable)
2020-06-18	Yakushima	Record high maximum temperature	33.6 C (92.5 F)	2.5 C (4.5 F)	57	32 of 100 (Routine)

The daily ledgers keep a limited number of records per day, so this list has 20 of the 673 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.

Margin (C)	Years the old record stood
4.0	74
1.3	88
4.0	64
2.2	70
2.6	65
2.7	68
2.7	58
4.7	55
2.7	50
0.3	54
1.5	59
2.8	58
0.6	72
1.4	77
3.8	34
1.8	64
3.3	49
2.5	57
0.6	68
3.7	63
2.3	60
1.6	64
2.6	50
3.5	36
1.9	71
2.5	42
1.4	58
1.5	58
1.0	68
3.9	42
3.0	42
1.0	64
1.0	64
4.9	22
0.8	69
1.2	64
2.0	55
0.5	69
1.4	61
0.4	68
1.7	65
0.3	6
1.2	65
2.1	58
2.6	51
2.8	51
2.5	42
1.5	48
1.1	59
1.0	59
2.3	38
3.1	27
1.2	63
4.1	36
0.2	68
0.4	64
0.2	69
0.9	58
3.3	34
0.2	68
0.5	64
2.5	48
3.1	39
0.2	67
2.7	40
1.7	53
0.5	69
1.3	64
0.8	65
0.9	62
1.8	53
2.1	53
1.7	52
1.1	58
2.1	53
0.6	58
1.6	50
0.1	64
2.2	48
1.3	49
2.6	30
2.6	42
1.8	43
0.1	64
1.4	49
0.1	65
2.7	27
4.2	42
1.8	40
3.0	43
1.2	62
1.4	44
1.1	59
0.1	66
0.5	62
2.7	42
2.8	46
0.2	60
0.1	64
0.2	64
0.3	63
2.1	36
0.7	58
1.0	50
2.3	39
2.2	42
1.3	49
1.8	49
1.6	49
1.8	40
1.8	40
1.7	43
1.7	43
2.8	27
2.7	27
0.1	64
1.0	53
1.1	42
2.5	40
1.5	53
0.7	54
0.9	59
2.1	48
1.5	43
0.8	52
0.9	48
1.4	42
2.2	30
0.3	58
1.0	49
2.5	42
1.8	42
2.0	42
0.3	55
1.7	42
0.1	59
2.1	29
1.5	43
1.1	44
1.5	42
2.0	41
2.0	27
0.9	49
0.9	49
1.4	40
0.6	50
1.6	40
2.1	29
0.6	56
0.6	50
0.6	52
0.7	52
1.8	36
0.4	52
2.1	42
1.0	45
1.3	43
0.4	52
0.8	49
1.6	49
1.4	49
0.5	49
1.4	42
1.3	49
0.8	44
0.3	53
1.5	42
3.9	17
1.2	45
0.5	49
2.2	27
4.3	10
0.5	48
3.0	28
1.5	42
0.2	53
3.0	34
5.8	10
0.1	52
0.2	52
0.6	51
0.4	51
1.4	43
1.2	43
1.0	42
0.6	44
1.0	42
0.9	40
0.5	49
1.6	32
2.3	24
0.8	40
0.2	51
0.3	49
2.2	18
0.3	48
0.6	49
0.8	42
2.2	27
2.1	27

Margin (C)	Years the old record stood
4.0	74
1.3	88
4.0	64
2.2	70
2.6	65
2.7	68
2.7	58
4.7	55
2.7	50
0.3	54
1.5	59
2.8	58
0.6	72
1.4	77
3.8	34
1.8	64
3.3	49
2.5	57
0.6	68
3.7	63
2.3	60
1.6	64
2.6	50
3.5	36
1.9	71
2.5	42
1.4	58
1.5	58
1.0	68
3.9	42
3.0	42
1.0	64
1.0	64
4.9	22
0.8	69
1.2	64
2.0	55
0.5	69
1.4	61
0.4	68
1.7	65
0.3	6
1.2	65
2.1	58
2.6	51
2.8	51
2.5	42
1.5	48
1.1	59
1.0	59
2.3	38
3.1	27
1.2	63
4.1	36
0.2	68
0.4	64
0.2	69
0.9	58
3.3	34
0.2	68
0.5	64
2.5	48
3.1	39
0.2	67
2.7	40
1.7	53
0.5	69
1.3	64
0.8	65
0.9	62
1.8	53
2.1	53
1.7	52
1.1	58
2.1	53
0.6	58
1.6	50
0.1	64
2.2	48
1.3	49
2.6	30
2.6	42
1.8	43
0.1	64
1.4	49
0.1	65
2.7	27
4.2	42
1.8	40
3.0	43
1.2	62
1.4	44
1.1	59
0.1	66
0.5	62
2.7	42
2.8	46
0.2	60
0.1	64
0.2	64
0.3	63
2.1	36
0.7	58
1.0	50
2.3	39
2.2	42
1.3	49
1.8	49
1.6	49
1.8	40
1.8	40
1.7	43
1.7	43
2.8	27
2.7	27
0.1	64
1.0	53
1.1	42
2.5	40
1.5	53
0.7	54
0.9	59
2.1	48
1.5	43
0.8	52
0.9	48
1.4	42
2.2	30
0.3	58
1.0	49
2.5	42
1.8	42
2.0	42
0.3	55
1.7	42
0.1	59
2.1	29
1.5	43
1.1	44
1.5	42
2.0	41
2.0	27
0.9	49
0.9	49
1.4	40
0.6	50
1.6	40
2.1	29
0.6	56
0.6	50
0.6	52
0.7	52
1.8	36
0.4	52
2.1	42
1.0	45
1.3	43
0.4	52
0.8	49
1.6	49
1.4	49
0.5	49
1.4	42
1.3	49
0.8	44
0.3	53
1.5	42
3.9	17
1.2	45
0.5	49
2.2	27
4.3	10
0.5	48
3.0	28
1.5	42
0.2	53
3.0	34
5.8	10
0.1	52
0.2	52
0.6	51
0.4	51
1.4	43
1.2	43
1.0	42
0.6	44
1.0	42
0.9	40
0.5	49
1.6	32
2.3	24
0.8	40
0.2	51
0.3	49
2.2	18
0.3	48
0.6	49
0.8	42
2.2	27
2.1	27