Heat wave in Japan and 5 other countries, 10 to 25 May 2018

Name: Heat wave in Japan and 5 other countries, 10 to 25 May 2018
Start: 2018-05-10
End: 2018-05-25
Location: Japan, China, Mongolia, Russia, Korea, South, Korea, North

Heat wave in Japan and 5 other countries, 10 to 25 May 2018: 505 records at 244 stations, peak on 16 May 2018. Closed.

Data as of 2026-10-12. Last revised 12 October 2026 (2026-10-12).

Key Facts

Heat wave in Japan and 5 other countries, 10 to 25 May 2018 set or tied 505 station records at 244 stations.
It ran from 10 May 2018 to 25 May 2018 (16 days) and its peak day was 16 May 2018.
Status: closed.
Svijagino set a daily record high minimum temperature of 17.8 C (64.0 F) on 16 May 2018.
The busiest day was 16 May 2018 with 126 records.
The oldest broken record in the ranked list had stood for 80 years.

Footprint

10 to 25 May 2018

The area covered by Heat wave in Japan and 5 other countries, 10 to 25 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 5 other countries, 10 to 25 May 2018: stations that set records in the event
Station	Type	Value	Date
Svijagino	Record high minimum temperature	17.8 C (64.0 F)	2018-05-16
Izuhara	Record high minimum temperature	22.6 C (72.7 F)	2018-05-17
Changde	Record high minimum temperature	25.5 C (77.9 F)	2018-05-16
Tottori	Record high minimum temperature	23.5 C (74.3 F)	2018-05-17
Makurazaki	Record high minimum temperature	23.8 C (74.8 F)	2018-05-17
Fukue	Record high minimum temperature	22.4 C (72.3 F)	2018-05-17
Vladivostok	Record high maximum temperature	24.9 C (76.8 F)	2018-05-11
Maebashi	Record high minimum temperature	20.3 C (68.5 F)	2018-05-17
Omaezaki	Record high minimum temperature	19.6 C (67.3 F)	2018-05-17
Shantou	Record high minimum temperature	27.6 C (81.7 F)	2018-05-19
Bailing-Miao	Record high minimum temperature	17.9 C (64.2 F)	2018-05-14
Jingdezhen	Record high minimum temperature	29.4 C (84.9 F)	2018-05-16
Hamada	Record high maximum temperature	31.0 C (87.8 F)	2018-05-17
Sumoto	Record high minimum temperature	19.4 C (66.9 F)	2018-05-17
Hita	Record high minimum temperature	22.2 C (72.0 F)	2018-05-17
Akune	Record high minimum temperature	22.6 C (72.7 F)	2018-05-17
Choshi	Record high minimum temperature	19.0 C (66.2 F)	2018-05-16
Nanchang	Record high minimum temperature	27.1 C (80.8 F)	2018-05-17
Karuizawa	Record high minimum temperature	15.5 C (59.9 F)	2018-05-17
Hanzhong	Record high minimum temperature	22.5 C (72.5 F)	2018-05-19

Records per Day

Peak day 126

Records set or tied each day from 10 May 2018 to 25 May 2018. The most in one day was 126 on 16 May 2018.

Records per day during Heat wave in Japan and 5 other countries, 10 to 25 May 2018
Date	Records
2018-05-10	1
2018-05-11	6
2018-05-12	4
2018-05-13	26
2018-05-14	53
2018-05-15	100
2018-05-16	126
2018-05-17	109
2018-05-18	48
2018-05-19	16
2018-05-20	5
2018-05-21	5
2018-05-22	3
2018-05-23	2
2018-05-25	1

Top Records by Margin

Margin over the record replaced

Top records of Heat wave in Japan and 5 other countries, 10 to 25 May 2018 ranked by margin
Jingdezhen, 05-16	6.6 C (11.9 F)
Izuhara, 05-17	5.5 C (9.9 F)
Fukue, 05-17	5.0 C (9.0 F)
Hita, 05-17	4.4 C (7.9 F)
Svijagino, 05-16	4.0 C (7.2 F)
Akune, 05-17	3.6 C (6.5 F)
Maebashi, 05-17	3.4 C (6.1 F)
Changde, 05-16	3.3 C (5.9 F)
Makurazaki, 05-17	3.3 C (5.9 F)
Sumoto, 05-17	2.3 C (4.1 F)
Omaezaki, 05-17	1.9 C (3.4 F)
Tottori, 05-17	1.8 C (3.2 F)
Vladivostok, 05-11	1.1 C (2.0 F)
Choshi, 05-16	1.0 C (1.8 F)
Karuizawa, 05-17	0.8 C (1.4 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, 10 to 25 May 2018
Margin (C)	Years the old record stood
4.0	80
5.5	40
3.3	65
1.8	47
3.3	63
5.0	44
0.5	54
3.4	56
1.9	67
1.1	73
0.1	59
6.6	20
0.2	57
2.3	63
4.4	55
3.6	44
0.2	54
0.1	54
0.8	52
1.0	68
2.1	65
2.0	65
1.7	63
2.5	36
0.3	80
1.1	69
4.7	44
0.5	48
0.2	54
3.0	57
1.8	65
2.7	55
3.9	40
3.5	40
1.1	68
3.6	44
2.4	63
1.5	65
2.5	56
2.8	60
2.6	55
4.3	44
2.4	55
2.7	40
2.2	56
1.1	65
2.0	53
2.4	55
2.4	55
1.7	55
2.9	53
1.6	60
1.8	57
1.9	53
2.2	55
2.5	55
1.5	65
2.1	55
2.5	55
1.4	56
0.7	65
0.7	65
4.0	44
1.9	56
2.4	55
1.0	59
1.2	56
3.4	40
2.3	55
2.7	16
4.9	16
1.6	44
3.1	44
2.9	48
1.5	63
1.2	65
2.5	53
0.7	61
0.5	64
2.9	55
2.3	53
0.6	65
1.3	55
0.5	36
1.8	20
0.8	65
1.6	55
1.2	55
4.0	49
0.1	69
3.0	27
2.1	53
2.3	53
3.0	49
0.4	30
0.6	33
1.3	53
0.5	61
1.5	53
1.4	55
0.4	64
1.9	48
0.2	67
2.0	48
2.3	40
5.3	31
1.8	51
0.7	59
0.7	60
2.3	44
0.9	55
1.1	53
1.6	55
0.8	53
0.1	64
0.3	60
1.5	55
1.3	55
0.9	56
0.8	60
2.1	47
1.3	53
1.0	55
0.8	55
5.4	16
0.7	56
0.1	65
0.3	65
1.0	55
1.0	55
1.5	40
3.8	47
2.1	44
0.2	63
0.6	59
2.0	49
0.6	55
0.7	53
1.1	48
0.5	53
3.0	35
0.8	55
1.4	47
2.9	40
0.9	53
0.2	26
0.8	55
0.8	55
0.9	53
0.8	53
0.5	55
0.6	55
0.8	52
1.0	19
0.5	56
1.4	48
0.5	56
3.6	20
0.5	57
0.4	56
0.8	55
1.3	48
3.7	16
4.0	32
1.5	51
2.8	40
2.3	41
2.0	36
1.5	44
0.7	55
1.4	40
0.3	55
0.6	55
0.3	55
0.2	59
0.4	55
0.4	55
1.6	44
3.2	16
0.1	56
0.5	55
0.2	25
1.7	13
4.4	25
2.8	32
0.4	56
2.5	37
2.7	29
1.1	48
1.0	49
0.5	47
1.6	41
0.4	55
0.4	52
0.1	53
1.6	31
0.7	48
3.1	20
1.0	48
0.1	55

Compared With Other Events

Station records per event

Station records in Heat wave in Japan and 5 other countries, 10 to 25 May 2018 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, 10 to 25 May 2018 (this event)	505 records

Every Record Set

20 of 505

Every record set or tied during Heat wave in Japan and 5 other countries, 10 to 25 May 2018, in date order
Date	Station	Record	Value	Margin	Years stood	Significance
2018-05-11	Vladivostok	Record high maximum temperature	24.9 C (76.8 F)	1.1 C (2.0 F)	73	34 of 100 (Routine)
2018-05-14	Bailing-Miao	Record high minimum temperature	17.9 C (64.2 F)	0.1 C (0.2 F)	59	33 of 100 (Routine)
2018-05-16	Svijagino	Record high minimum temperature	17.8 C (64.0 F)	4.0 C (7.2 F)	80	43 of 100 (Notable)
2018-05-16	Changde	Record high minimum temperature	25.5 C (77.9 F)	3.3 C (5.9 F)	65	35 of 100 (Notable)
2018-05-16	Jingdezhen	Record high minimum temperature	29.4 C (84.9 F)	6.6 C (11.9 F)	20	33 of 100 (Routine)
2018-05-16	Choshi	Record high minimum temperature	19.0 C (66.2 F)	1.0 C (1.8 F)	68	32 of 100 (Routine)
2018-05-17	Izuhara	Record high minimum temperature	22.6 C (72.7 F)	5.5 C (9.9 F)	40	39 of 100 (Notable)
2018-05-17	Tottori	Record high minimum temperature	23.5 C (74.3 F)	1.8 C (3.2 F)	47	35 of 100 (Notable)
2018-05-17	Makurazaki	Record high minimum temperature	23.8 C (74.8 F)	3.3 C (5.9 F)	63	35 of 100 (Notable)
2018-05-17	Fukue	Record high minimum temperature	22.4 C (72.3 F)	5.0 C (9.0 F)	44	35 of 100 (Notable)
2018-05-17	Maebashi	Record high minimum temperature	20.3 C (68.5 F)	3.4 C (6.1 F)	56	34 of 100 (Routine)
2018-05-17	Omaezaki	Record high minimum temperature	19.6 C (67.3 F)	1.9 C (3.4 F)	67	34 of 100 (Routine)
2018-05-17	Hamada	Record high maximum temperature	31.0 C (87.8 F)	0.2 C (0.4 F)	57	33 of 100 (Routine)
2018-05-17	Sumoto	Record high minimum temperature	19.4 C (66.9 F)	2.3 C (4.1 F)	63	33 of 100 (Routine)
2018-05-17	Hita	Record high minimum temperature	22.2 C (72.0 F)	4.4 C (7.9 F)	55	33 of 100 (Routine)
2018-05-17	Akune	Record high minimum temperature	22.6 C (72.7 F)	3.6 C (6.5 F)	44	33 of 100 (Routine)
2018-05-17	Nanchang	Record high minimum temperature	27.1 C (80.8 F)	0.1 C (0.2 F)	54	32 of 100 (Routine)
2018-05-17	Karuizawa	Record high minimum temperature	15.5 C (59.9 F)	0.8 C (1.4 F)	52	32 of 100 (Routine)
2018-05-19	Shantou	Record high minimum temperature	27.6 C (81.7 F)	0.5 C (0.9 F)	54	34 of 100 (Routine)
2018-05-19	Hanzhong	Record high minimum temperature	22.5 C (72.5 F)	0.2 C (0.4 F)	54	32 of 100 (Routine)

The daily ledgers keep a limited number of records per day, so this list has 20 of the 505 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 2026-10-12. 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	80
5.5	40
3.3	65
1.8	47
3.3	63
5.0	44
0.5	54
3.4	56
1.9	67
1.1	73
0.1	59
6.6	20
0.2	57
2.3	63
4.4	55
3.6	44
0.2	54
0.1	54
0.8	52
1.0	68
2.1	65
2.0	65
1.7	63
2.5	36
0.3	80
1.1	69
4.7	44
0.5	48
0.2	54
3.0	57
1.8	65
2.7	55
3.9	40
3.5	40
1.1	68
3.6	44
2.4	63
1.5	65
2.5	56
2.8	60
2.6	55
4.3	44
2.4	55
2.7	40
2.2	56
1.1	65
2.0	53
2.4	55
2.4	55
1.7	55
2.9	53
1.6	60
1.8	57
1.9	53
2.2	55
2.5	55
1.5	65
2.1	55
2.5	55
1.4	56
0.7	65
0.7	65
4.0	44
1.9	56
2.4	55
1.0	59
1.2	56
3.4	40
2.3	55
2.7	16
4.9	16
1.6	44
3.1	44
2.9	48
1.5	63
1.2	65
2.5	53
0.7	61
0.5	64
2.9	55
2.3	53
0.6	65
1.3	55
0.5	36
1.8	20
0.8	65
1.6	55
1.2	55
4.0	49
0.1	69
3.0	27
2.1	53
2.3	53
3.0	49
0.4	30
0.6	33
1.3	53
0.5	61
1.5	53
1.4	55
0.4	64
1.9	48
0.2	67
2.0	48
2.3	40
5.3	31
1.8	51
0.7	59
0.7	60
2.3	44
0.9	55
1.1	53
1.6	55
0.8	53
0.1	64
0.3	60
1.5	55
1.3	55
0.9	56
0.8	60
2.1	47
1.3	53
1.0	55
0.8	55
5.4	16
0.7	56
0.1	65
0.3	65
1.0	55
1.0	55
1.5	40
3.8	47
2.1	44
0.2	63
0.6	59
2.0	49
0.6	55
0.7	53
1.1	48
0.5	53
3.0	35
0.8	55
1.4	47
2.9	40
0.9	53
0.2	26
0.8	55
0.8	55
0.9	53
0.8	53
0.5	55
0.6	55
0.8	52
1.0	19
0.5	56
1.4	48
0.5	56
3.6	20
0.5	57
0.4	56
0.8	55
1.3	48
3.7	16
4.0	32
1.5	51
2.8	40
2.3	41
2.0	36
1.5	44
0.7	55
1.4	40
0.3	55
0.6	55
0.3	55
0.2	59
0.4	55
0.4	55
1.6	44
3.2	16
0.1	56
0.5	55
0.2	25
1.7	13
4.4	25
2.8	32
0.4	56
2.5	37
2.7	29
1.1	48
1.0	49
0.5	47
1.6	41
0.4	55
0.4	52
0.1	53
1.6	31
0.7	48
3.1	20
1.0	48
0.1	55

Margin (C)	Years the old record stood
4.0	80
5.5	40
3.3	65
1.8	47
3.3	63
5.0	44
0.5	54
3.4	56
1.9	67
1.1	73
0.1	59
6.6	20
0.2	57
2.3	63
4.4	55
3.6	44
0.2	54
0.1	54
0.8	52
1.0	68
2.1	65
2.0	65
1.7	63
2.5	36
0.3	80
1.1	69
4.7	44
0.5	48
0.2	54
3.0	57
1.8	65
2.7	55
3.9	40
3.5	40
1.1	68
3.6	44
2.4	63
1.5	65
2.5	56
2.8	60
2.6	55
4.3	44
2.4	55
2.7	40
2.2	56
1.1	65
2.0	53
2.4	55
2.4	55
1.7	55
2.9	53
1.6	60
1.8	57
1.9	53
2.2	55
2.5	55
1.5	65
2.1	55
2.5	55
1.4	56
0.7	65
0.7	65
4.0	44
1.9	56
2.4	55
1.0	59
1.2	56
3.4	40
2.3	55
2.7	16
4.9	16
1.6	44
3.1	44
2.9	48
1.5	63
1.2	65
2.5	53
0.7	61
0.5	64
2.9	55
2.3	53
0.6	65
1.3	55
0.5	36
1.8	20
0.8	65
1.6	55
1.2	55
4.0	49
0.1	69
3.0	27
2.1	53
2.3	53
3.0	49
0.4	30
0.6	33
1.3	53
0.5	61
1.5	53
1.4	55
0.4	64
1.9	48
0.2	67
2.0	48
2.3	40
5.3	31
1.8	51
0.7	59
0.7	60
2.3	44
0.9	55
1.1	53
1.6	55
0.8	53
0.1	64
0.3	60
1.5	55
1.3	55
0.9	56
0.8	60
2.1	47
1.3	53
1.0	55
0.8	55
5.4	16
0.7	56
0.1	65
0.3	65
1.0	55
1.0	55
1.5	40
3.8	47
2.1	44
0.2	63
0.6	59
2.0	49
0.6	55
0.7	53
1.1	48
0.5	53
3.0	35
0.8	55
1.4	47
2.9	40
0.9	53
0.2	26
0.8	55
0.8	55
0.9	53
0.8	53
0.5	55
0.6	55
0.8	52
1.0	19
0.5	56
1.4	48
0.5	56
3.6	20
0.5	57
0.4	56
0.8	55
1.3	48
3.7	16
4.0	32
1.5	51
2.8	40
2.3	41
2.0	36
1.5	44
0.7	55
1.4	40
0.3	55
0.6	55
0.3	55
0.2	59
0.4	55
0.4	55
1.6	44
3.2	16
0.1	56
0.5	55
0.2	25
1.7	13
4.4	25
2.8	32
0.4	56
2.5	37
2.7	29
1.1	48
1.0	49
0.5	47
1.6	41
0.4	55
0.4	52
0.1	53
1.6	31
0.7	48
3.1	20
1.0	48
0.1	55