Heat wave in Thailand and 3 other countries, 13 to 21 May 2019

Name: Heat wave in Thailand and 3 other countries, 13 to 21 May 2019
Start: 2019-05-13
End: 2019-05-21
Location: Thailand, Vietnam, China, Macau S.A.R

Heat wave in Thailand and 3 other countries, 13 to 21 May 2019: 116 records at 48 stations, peak on 19 May 2019. Closed.

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

Key Facts

Heat wave in Thailand and 3 other countries, 13 to 21 May 2019 set or tied 116 station records at 48 stations.
It ran from 13 May 2019 to 21 May 2019 (9 days) and its peak day was 19 May 2019.
Status: closed.
Chiang Rai set an all-time record high maximum temperature of 41.8 C (107.2 F) on 19 May 2019.
The busiest day was 19 May 2019 with 37 records.
The oldest broken record in the ranked list had stood for 76 years.

Footprint

13 to 21 May 2019

The area covered by Heat wave in Thailand and 3 other countries, 13 to 21 May 2019 is outlined, with 13 of the stations that set records marked, coloured by record type. Made with Natural Earth.

Footprint of Heat wave in Thailand and 3 other countries, 13 to 21 May 2019: stations that set records in the event
Station	Type	Value	Date
Chiang Rai	Record high maximum temperature	41.8 C (107.2 F)	2019-05-19
Chiang Mai	Record high maximum temperature	40.1 C (104.2 F)	2019-05-19
Lampang	Record high minimum temperature	27.2 C (81.0 F)	2019-05-19
Bangkok Metropolis	Record high maximum temperature	39.2 C (102.6 F)	2019-05-19
Phrae	Record high maximum temperature	41.1 C (106.0 F)	2019-05-18
Sakon Nakhon	Record high minimum temperature	28.7 C (83.7 F)	2019-05-20
Dong Hoi	Record high minimum temperature	32.3 C (90.1 F)	2019-05-19
Lancang	Record high maximum temperature	35.7 C (96.3 F)	2019-05-13
Phetchabun	Record high minimum temperature	27.0 C (80.6 F)	2019-05-19
Don Muang	Record high minimum temperature	29.4 C (84.9 F)	2019-05-19
Uttaradit	Record high maximum temperature	41.4 C (106.5 F)	2019-05-18
Tak	Record high minimum temperature	29.0 C (84.2 F)	2019-05-18
Chuxiong	Record high minimum temperature	19.4 C (66.9 F)	2019-05-14

Records per Day

Peak day 37

Records set or tied each day from 13 May 2019 to 21 May 2019. The most in one day was 37 on 19 May 2019.

Records per day during Heat wave in Thailand and 3 other countries, 13 to 21 May 2019
Date	Records
2019-05-13	1
2019-05-14	3
2019-05-15	2
2019-05-16	3
2019-05-17	9
2019-05-18	28
2019-05-19	37
2019-05-20	25
2019-05-21	8

Top Records by Margin

Margin over the record replaced

Top records of Heat wave in Thailand and 3 other countries, 13 to 21 May 2019 ranked by margin
Chiang Mai, 05-20	2.3 C (4.1 F)
Don Muang, 05-19	1.6 C (2.9 F)
Chuxiong, 05-20	1.5 C (2.7 F)
Bangkok Metropolis, 05-19	1.3 C (2.3 F)
Phrae, 05-18	1.3 C (2.3 F)
Chiang Mai, 05-19	1.2 C (2.2 F)
Sakon Nakhon, 05-20	1.2 C (2.2 F)
Lampang, 05-19	1.1 C (2.0 F)
Lancang, 05-21	1.0 C (1.8 F)
Chiang Rai, 05-18	1.0 C (1.8 F)
Uttaradit, 05-18	1.0 C (1.8 F)
Uttaradit, 05-18	1.0 C (1.8 F)
Phrae, 05-19	0.9 C (1.6 F)
Chiang Rai, 05-19	0.5 C (0.9 F)
Dong Hoi, 05-19	0.5 C (0.9 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

116 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 Thailand and 3 other countries, 13 to 21 May 2019
Margin (C)	Years the old record stood
0.5	59
1.2	76
1.1	56
2.3	56
1.3	61
1.3	61
1.2	49
0.5	3
0.3	64
1.0	56
0.9	49
0.4	57
1.6	32
1.0	42
0.4	61
1.0	42
1.0	56
0.3	61
1.5	49
0.2	60
0.2	61
0.2	61
0.1	57
0.3	56
2.6	13
1.4	16
1.7	29
0.6	45
0.5	40
1.1	26
1.6	36
0.2	16
0.1	49
1.5	16
0.2	45
0.1	49
1.3	41
1.0	41
0.3	41
0.4	41
1.1	26
0.5	38
0.9	36
2.5	16
0.6	36
0.6	26
2.4	16
0.9	28
0.4	32
0.3	32
0.4	32
0.4	32
1.8	16
0.2	41
2.8	5
2.2	13
0.2	36
0.4	28
0.2	8
0.4	3
0.4	29
1.2	13
1.0	13
1.0	8
0.3	28
0.2	26
0.1	3
3.5	5
0.3	24
0.1	26
1.6	8
2.6	5
0.2	0
0.3	20
1.0	5
1.9	6
0.1	24
1.1	8
0.7	13
1.0	2
1.0	4
0.8	8
1.8	13
0.8	8
0.3	16
1.6	13
0.2	16
0.1	20
1.2	0
0.3	16
1.3	4
2.0	8
0.1	13
0.6	8
0.7	4
0.2	13
0.5	8
0.1	16
0.4	8
0.4	8
0.8	0
0.1	8
0.5	2
0.2	8
0.1	6
0.8	2
0.2	4
0.8	8
0.4	0
0.2	4
0.8	4
0.3	2
0.3	2
0.1	0
0.2	2
0.1	4

Compared With Other Events

Station records per event

Station records in Heat wave in Thailand and 3 other countries, 13 to 21 May 2019 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 Thailand and 3 other countries, 13 to 21 May 2019 (this event)	116 records

Every Record Set

20 of 116

Every record set or tied during Heat wave in Thailand and 3 other countries, 13 to 21 May 2019, in date order
Date	Station	Record	Value	Margin	Years stood	Significance
2019-05-13	Lancang	Record high maximum temperature	35.7 C (96.3 F)	0.3 C (0.5 F)	64	26 of 100 (Routine)
2019-05-14	Chuxiong	Record high minimum temperature	19.4 C (66.9 F)	0.2 C (0.4 F)	60	24 of 100 (Routine)
2019-05-18	Phrae	Record high maximum temperature	41.1 C (106.0 F)	1.3 C (2.3 F)	61	28 of 100 (Routine)
2019-05-18	Chiang Rai	Record high minimum temperature	26.0 C (78.8 F)	1.0 C (1.8 F)	42	25 of 100 (Routine)
2019-05-18	Lampang	Record high maximum temperature	40.7 C (105.3 F)	0.4 C (0.7 F)	61	25 of 100 (Routine)
2019-05-18	Uttaradit	Record high maximum temperature	41.4 C (106.5 F)	1.0 C (1.8 F)	56	25 of 100 (Routine)
2019-05-18	Uttaradit	Record high minimum temperature	28.0 C (82.4 F)	1.0 C (1.8 F)	42	25 of 100 (Routine)
2019-05-18	Tak	Record high minimum temperature	29.0 C (84.2 F)	0.3 C (0.5 F)	61	25 of 100 (Routine)
2019-05-19	Chiang Rai	Record high maximum temperature	41.8 C (107.2 F)	0.5 C (0.9 F)	59	44 of 100 (Notable)
2019-05-19	Chiang Mai	Record high maximum temperature	40.1 C (104.2 F)	1.2 C (2.2 F)	76	33 of 100 (Routine)
2019-05-19	Lampang	Record high minimum temperature	27.2 C (81.0 F)	1.1 C (2.0 F)	56	32 of 100 (Routine)
2019-05-19	Bangkok Metropolis	Record high maximum temperature	39.2 C (102.6 F)	1.3 C (2.3 F)	61	30 of 100 (Routine)
2019-05-19	Dong Hoi	Record high minimum temperature	32.3 C (90.1 F)	0.5 C (0.9 F)	3	27 of 100 (Routine)
2019-05-19	Phrae	Record high minimum temperature	28.0 C (82.4 F)	0.9 C (1.6 F)	49	26 of 100 (Routine)
2019-05-19	Phetchabun	Record high minimum temperature	27.0 C (80.6 F)	0.4 C (0.7 F)	57	26 of 100 (Routine)
2019-05-19	Don Muang	Record high minimum temperature	29.4 C (84.9 F)	1.6 C (2.9 F)	32	26 of 100 (Routine)
2019-05-20	Chiang Mai	Record high maximum temperature	40.3 C (104.5 F)	2.3 C (4.1 F)	56	31 of 100 (Routine)
2019-05-20	Sakon Nakhon	Record high minimum temperature	28.7 C (83.7 F)	1.2 C (2.2 F)	49	28 of 100 (Routine)
2019-05-20	Chuxiong	Record high maximum temperature	33.2 C (91.8 F)	1.5 C (2.7 F)	49	24 of 100 (Routine)
2019-05-21	Lancang	Record high maximum temperature	36.0 C (96.8 F)	1.0 C (1.8 F)	56	26 of 100 (Routine)

The daily ledgers keep a limited number of records per day, so this list has 20 of the 116 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
0.5	59
1.2	76
1.1	56
2.3	56
1.3	61
1.3	61
1.2	49
0.5	3
0.3	64
1.0	56
0.9	49
0.4	57
1.6	32
1.0	42
0.4	61
1.0	42
1.0	56
0.3	61
1.5	49
0.2	60
0.2	61
0.2	61
0.1	57
0.3	56
2.6	13
1.4	16
1.7	29
0.6	45
0.5	40
1.1	26
1.6	36
0.2	16
0.1	49
1.5	16
0.2	45
0.1	49
1.3	41
1.0	41
0.3	41
0.4	41
1.1	26
0.5	38
0.9	36
2.5	16
0.6	36
0.6	26
2.4	16
0.9	28
0.4	32
0.3	32
0.4	32
0.4	32
1.8	16
0.2	41
2.8	5
2.2	13
0.2	36
0.4	28
0.2	8
0.4	3
0.4	29
1.2	13
1.0	13
1.0	8
0.3	28
0.2	26
0.1	3
3.5	5
0.3	24
0.1	26
1.6	8
2.6	5
0.2	0
0.3	20
1.0	5
1.9	6
0.1	24
1.1	8
0.7	13
1.0	2
1.0	4
0.8	8
1.8	13
0.8	8
0.3	16
1.6	13
0.2	16
0.1	20
1.2	0
0.3	16
1.3	4
2.0	8
0.1	13
0.6	8
0.7	4
0.2	13
0.5	8
0.1	16
0.4	8
0.4	8
0.8	0
0.1	8
0.5	2
0.2	8
0.1	6
0.8	2
0.2	4
0.8	8
0.4	0
0.2	4
0.8	4
0.3	2
0.3	2
0.1	0
0.2	2
0.1	4

Margin (C)	Years the old record stood
0.5	59
1.2	76
1.1	56
2.3	56
1.3	61
1.3	61
1.2	49
0.5	3
0.3	64
1.0	56
0.9	49
0.4	57
1.6	32
1.0	42
0.4	61
1.0	42
1.0	56
0.3	61
1.5	49
0.2	60
0.2	61
0.2	61
0.1	57
0.3	56
2.6	13
1.4	16
1.7	29
0.6	45
0.5	40
1.1	26
1.6	36
0.2	16
0.1	49
1.5	16
0.2	45
0.1	49
1.3	41
1.0	41
0.3	41
0.4	41
1.1	26
0.5	38
0.9	36
2.5	16
0.6	36
0.6	26
2.4	16
0.9	28
0.4	32
0.3	32
0.4	32
0.4	32
1.8	16
0.2	41
2.8	5
2.2	13
0.2	36
0.4	28
0.2	8
0.4	3
0.4	29
1.2	13
1.0	13
1.0	8
0.3	28
0.2	26
0.1	3
3.5	5
0.3	24
0.1	26
1.6	8
2.6	5
0.2	0
0.3	20
1.0	5
1.9	6
0.1	24
1.1	8
0.7	13
1.0	2
1.0	4
0.8	8
1.8	13
0.8	8
0.3	16
1.6	13
0.2	16
0.1	20
1.2	0
0.3	16
1.3	4
2.0	8
0.1	13
0.6	8
0.7	4
0.2	13
0.5	8
0.1	16
0.4	8
0.4	8
0.8	0
0.1	8
0.5	2
0.2	8
0.1	6
0.8	2
0.2	4
0.8	8
0.4	0
0.2	4
0.8	4
0.3	2
0.3	2
0.1	0
0.2	2
0.1	4