Heat wave in Finland and 10 other countries, 5 to 27 April 2023

Name: Heat wave in Finland and 10 other countries, 5 to 27 April 2023
Start: 2023-04-05
End: 2023-04-27
Location: Finland, Sweden, Norway, Estonia, Russia, Latvia, Belarus, Lithuania, Germany, Poland, Ukraine

Heat wave in Finland and 10 other countries, 5 to 27 April 2023: 336 records at 187 stations, peak on 10 April 2023. Closed.

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

Key Facts

Heat wave in Finland and 10 other countries, 5 to 27 April 2023 set or tied 336 station records at 187 stations.
It ran from 5 April 2023 to 27 April 2023 (23 days) and its peak day was 10 April 2023.
Status: closed.
Narva set a daily record high maximum temperature of 17.8 C (64.0 F) on 11 April 2023.
The busiest day was 10 April 2023 with 49 records.
The oldest broken record in the ranked list had stood for 97 years.

Footprint

5 to 27 April 2023

The area covered by Heat wave in Finland and 10 other countries, 5 to 27 April 2023 is outlined, with 17 of the stations that set records marked, coloured by record type. Made with Natural Earth.

Footprint of Heat wave in Finland and 10 other countries, 5 to 27 April 2023: stations that set records in the event
Station	Type	Value	Date
Narva	Record high maximum temperature	17.8 C (64.0 F)	2023-04-11
Sodankyla AWS	Record high maximum temperature	10.0 C (50.0 F)	2023-04-07
Voru	Record high minimum temperature	12.9 C (55.2 F)	2023-04-24
Ljusnedal	Record high minimum temperature	1.4 C (34.5 F)	2023-04-13
Sauda	Record high minimum temperature	8.1 C (46.6 F)	2023-04-14
Falsterbo	Record high minimum temperature	7.4 C (45.3 F)	2023-04-16
Vilsandi	Record high maximum temperature	15.8 C (60.4 F)	2023-04-11
Reboly	Record high maximum temperature	8.8 C (47.8 F)	2023-04-10
Jackvik	Record high minimum temperature	3.1 C (37.6 F)	2023-04-20
Orel	Record high minimum temperature	8.2 C (46.8 F)	2023-04-06
Kihnu	Record high minimum temperature	5.1 C (41.2 F)	2023-04-11
Virtsu	Record high maximum temperature	15.2 C (59.4 F)	2023-04-07
Vinga	Record high maximum temperature	13.1 C (55.6 F)	2023-04-08
Kunda	Record high minimum temperature	5.8 C (42.4 F)	2023-04-22
Hanko Tulliniemi	Record high maximum temperature	14.0 C (57.2 F)	2023-04-12
Sandane	Record high maximum temperature	13.6 C (56.5 F)	2023-04-09
Sortland-Kleiva	Record high maximum temperature	10.8 C (51.4 F)	2023-04-09

Records per Day

Peak day 49

Records set or tied each day from 5 April 2023 to 27 April 2023. The most in one day was 49 on 10 April 2023.

Records per day during Heat wave in Finland and 10 other countries, 5 to 27 April 2023
Date	Records
2023-04-05	2
2023-04-06	12
2023-04-07	22
2023-04-08	19
2023-04-09	40
2023-04-10	49
2023-04-11	34
2023-04-12	46
2023-04-13	25
2023-04-14	12
2023-04-15	5
2023-04-16	1
2023-04-17	1
2023-04-18	3
2023-04-19	6
2023-04-20	28
2023-04-21	16
2023-04-22	9
2023-04-23	2
2023-04-24	2
2023-04-25	1
2023-04-27	1

Top Records by Margin

Margin over the record replaced

Top records of Heat wave in Finland and 10 other countries, 5 to 27 April 2023 ranked by margin
Hanko Tulliniemi, 04-12	5.5 C (9.9 F)
Vilsandi, 04-11	3.9 C (7.0 F)
Voru, 04-24	2.9 C (5.2 F)
Virtsu, 04-07	2.9 C (5.2 F)
Vinga, 04-08	2.7 C (4.9 F)
Narva, 04-11	2.6 C (4.7 F)
Kihnu, 04-11	1.4 C (2.5 F)
Orel, 04-06	1.0 C (1.8 F)
Vilsandi, 04-12	1.0 C (1.8 F)
Sandane, 04-09	0.8 C (1.4 F)
Sodankyla AWS, 04-07	0.7 C (1.3 F)
Sauda, 04-14	0.7 C (1.3 F)
Sortland-Kleiva, 04-09	0.7 C (1.3 F)
Sodankyla AWS, 04-10	0.4 C (0.7 F)
Ljusnedal, 04-13	0.4 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

336 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 Finland and 10 other countries, 5 to 27 April 2023
Margin (C)	Years the old record stood
2.6	92
0.7	97
0.4	97
2.9	72
0.7	85
0.2	92
0.4	92
3.9	50
0.1	74
0.1	77
1.4	64
1.0	72
0.3	76
0.1	76
2.9	56
2.7	48
1.0	50
5.5	20
0.8	62
0.7	62
2.0	52
0.2	64
0.4	62
0.5	60
1.4	53
0.9	56
0.4	62
0.4	48
0.2	56
0.2	60
0.4	53
0.6	62
1.2	48
0.8	56
0.2	62
0.9	56
1.6	46
2.2	33
0.2	58
0.7	28
0.7	53
0.4	54
0.3	53
2.4	33
1.7	32
3.2	32
0.2	53
1.7	40
0.8	48
4.5	20
0.7	56
0.1	56
0.3	44
0.6	48
1.5	38
0.3	52
2.8	32
4.0	20
2.8	38
0.7	46
1.8	33
0.1	33
1.2	33
1.5	32
1.6	38
0.3	46
0.3	33
0.9	33
1.3	33
1.9	32
1.6	22
0.2	48
0.2	48
0.9	33
1.0	33
0.3	32
0.3	41
2.8	20
0.7	33
0.8	32
0.5	26
0.5	41
0.1	40
0.6	36
0.7	33
1.0	32
0.4	33
1.2	32
0.2	33
0.9	28
2.3	10
2.0	20
0.2	24
0.7	32
1.3	20
2.9	20
0.2	38
0.1	38
0.3	38
0.5	33
2.9	20
0.6	32
1.3	32
3.4	12
0.3	33
0.3	33
0.1	33
0.2	33
0.2	32
1.6	12
0.1	33
1.9	20
0.8	32
3.6	8
0.2	38
0.5	32
0.5	32
1.6	20
0.2	32
0.1	33
2.4	18
0.2	32
0.2	33
0.1	32
1.9	8
2.7	1
0.1	33
0.9	20
1.4	20
1.3	20
1.3	22
0.2	32
0.2	32
0.7	32
3.2	1
2.0	16
1.8	18
1.4	16
1.7	13
0.1	33
0.3	33
1.6	17
2.4	20
0.8	33
0.9	20
0.9	20
1.8	8
0.1	24
1.8	8
0.8	20
0.3	24
1.2	20
1.1	28
0.9	20
1.2	20
1.5	22
0.3	32
1.3	16
1.5	18
1.0	18
0.7	17
1.7	4
0.7	18
1.8	14
0.8	20
1.0	26
1.9	4
0.9	20
0.3	20
0.1	20
0.5	21
1.9	8
0.7	20
0.6	20
0.2	21
0.8	20
0.9	20
2.1	16
1.1	18
0.5	22
1.8	22
0.5	21
0.5	22
0.2	26
0.9	18
0.5	22
0.6	20
0.9	20
1.4	20
1.4	20
1.1	16
0.1	32
0.9	20
0.5	21
0.8	17
1.0	8
1.1	14
0.4	17
2.3	8
0.5	8

Compared With Other Events

Station records per event

Station records in Heat wave in Finland and 10 other countries, 5 to 27 April 2023 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 Finland and 10 other countries, 5 to 27 April 2023 (this event)	336 records

Every Record Set

20 of 336

Every record set or tied during Heat wave in Finland and 10 other countries, 5 to 27 April 2023, in date order
Date	Station	Record	Value	Margin	Years stood	Significance
2023-04-06	Orel	Record high minimum temperature	8.2 C (46.8 F)	1.0 C (1.8 F)	72	30 of 100 (Routine)
2023-04-07	Sodankyla AWS	Record high maximum temperature	10.0 C (50.0 F)	0.7 C (1.3 F)	97	40 of 100 (Notable)
2023-04-07	Virtsu	Record high maximum temperature	15.2 C (59.4 F)	2.9 C (5.2 F)	56	29 of 100 (Routine)
2023-04-08	Vinga	Record high maximum temperature	13.1 C (55.6 F)	2.7 C (4.9 F)	48	29 of 100 (Routine)
2023-04-09	Sandane	Record high maximum temperature	13.6 C (56.5 F)	0.8 C (1.4 F)	62	26 of 100 (Routine)
2023-04-09	Sortland-Kleiva	Record high maximum temperature	10.8 C (51.4 F)	0.7 C (1.3 F)	62	26 of 100 (Routine)
2023-04-10	Sodankyla AWS	Record high maximum temperature	9.0 C (48.2 F)	0.4 C (0.7 F)	97	39 of 100 (Notable)
2023-04-10	Reboly	Record high maximum temperature	8.8 C (47.8 F)	0.1 C (0.2 F)	74	32 of 100 (Routine)
2023-04-11	Narva	Record high maximum temperature	17.8 C (64.0 F)	2.6 C (4.7 F)	92	41 of 100 (Notable)
2023-04-11	Vilsandi	Record high maximum temperature	15.8 C (60.4 F)	3.9 C (7.0 F)	50	34 of 100 (Routine)
2023-04-11	Kihnu	Record high minimum temperature	5.1 C (41.2 F)	1.4 C (2.5 F)	64	30 of 100 (Routine)
2023-04-12	Vilsandi	Record high minimum temperature	6.5 C (43.7 F)	1.0 C (1.8 F)	50	28 of 100 (Routine)
2023-04-12	Hanko Tulliniemi	Record high maximum temperature	14.0 C (57.2 F)	5.5 C (9.9 F)	20	27 of 100 (Routine)
2023-04-13	Ljusnedal	Record high minimum temperature	1.4 C (34.5 F)	0.4 C (0.7 F)	92	36 of 100 (Notable)
2023-04-14	Sauda	Record high minimum temperature	8.1 C (46.6 F)	0.7 C (1.3 F)	85	36 of 100 (Notable)
2023-04-16	Falsterbo	Record high minimum temperature	7.4 C (45.3 F)	0.2 C (0.4 F)	92	36 of 100 (Notable)
2023-04-20	Jackvik	Record high minimum temperature	3.1 C (37.6 F)	0.1 C (0.2 F)	77	31 of 100 (Routine)
2023-04-22	Kunda	Record high minimum temperature	5.8 C (42.4 F)	0.1 C (0.2 F)	76	29 of 100 (Routine)
2023-04-23	Kunda	Record high maximum temperature	20.5 C (68.9 F)	0.3 C (0.5 F)	76	29 of 100 (Routine)
2023-04-24	Voru	Record high minimum temperature	12.9 C (55.2 F)	2.9 C (5.2 F)	72	38 of 100 (Notable)

The daily ledgers keep a limited number of records per day, so this list has 20 of the 336 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
2.6	92
0.7	97
0.4	97
2.9	72
0.7	85
0.2	92
0.4	92
3.9	50
0.1	74
0.1	77
1.4	64
1.0	72
0.3	76
0.1	76
2.9	56
2.7	48
1.0	50
5.5	20
0.8	62
0.7	62
2.0	52
0.2	64
0.4	62
0.5	60
1.4	53
0.9	56
0.4	62
0.4	48
0.2	56
0.2	60
0.4	53
0.6	62
1.2	48
0.8	56
0.2	62
0.9	56
1.6	46
2.2	33
0.2	58
0.7	28
0.7	53
0.4	54
0.3	53
2.4	33
1.7	32
3.2	32
0.2	53
1.7	40
0.8	48
4.5	20
0.7	56
0.1	56
0.3	44
0.6	48
1.5	38
0.3	52
2.8	32
4.0	20
2.8	38
0.7	46
1.8	33
0.1	33
1.2	33
1.5	32
1.6	38
0.3	46
0.3	33
0.9	33
1.3	33
1.9	32
1.6	22
0.2	48
0.2	48
0.9	33
1.0	33
0.3	32
0.3	41
2.8	20
0.7	33
0.8	32
0.5	26
0.5	41
0.1	40
0.6	36
0.7	33
1.0	32
0.4	33
1.2	32
0.2	33
0.9	28
2.3	10
2.0	20
0.2	24
0.7	32
1.3	20
2.9	20
0.2	38
0.1	38
0.3	38
0.5	33
2.9	20
0.6	32
1.3	32
3.4	12
0.3	33
0.3	33
0.1	33
0.2	33
0.2	32
1.6	12
0.1	33
1.9	20
0.8	32
3.6	8
0.2	38
0.5	32
0.5	32
1.6	20
0.2	32
0.1	33
2.4	18
0.2	32
0.2	33
0.1	32
1.9	8
2.7	1
0.1	33
0.9	20
1.4	20
1.3	20
1.3	22
0.2	32
0.2	32
0.7	32
3.2	1
2.0	16
1.8	18
1.4	16
1.7	13
0.1	33
0.3	33
1.6	17
2.4	20
0.8	33
0.9	20
0.9	20
1.8	8
0.1	24
1.8	8
0.8	20
0.3	24
1.2	20
1.1	28
0.9	20
1.2	20
1.5	22
0.3	32
1.3	16
1.5	18
1.0	18
0.7	17
1.7	4
0.7	18
1.8	14
0.8	20
1.0	26
1.9	4
0.9	20
0.3	20
0.1	20
0.5	21
1.9	8
0.7	20
0.6	20
0.2	21
0.8	20
0.9	20
2.1	16
1.1	18
0.5	22
1.8	22
0.5	21
0.5	22
0.2	26
0.9	18
0.5	22
0.6	20
0.9	20
1.4	20
1.4	20
1.1	16
0.1	32
0.9	20
0.5	21
0.8	17
1.0	8
1.1	14
0.4	17
2.3	8
0.5	8

Margin (C)	Years the old record stood
2.6	92
0.7	97
0.4	97
2.9	72
0.7	85
0.2	92
0.4	92
3.9	50
0.1	74
0.1	77
1.4	64
1.0	72
0.3	76
0.1	76
2.9	56
2.7	48
1.0	50
5.5	20
0.8	62
0.7	62
2.0	52
0.2	64
0.4	62
0.5	60
1.4	53
0.9	56
0.4	62
0.4	48
0.2	56
0.2	60
0.4	53
0.6	62
1.2	48
0.8	56
0.2	62
0.9	56
1.6	46
2.2	33
0.2	58
0.7	28
0.7	53
0.4	54
0.3	53
2.4	33
1.7	32
3.2	32
0.2	53
1.7	40
0.8	48
4.5	20
0.7	56
0.1	56
0.3	44
0.6	48
1.5	38
0.3	52
2.8	32
4.0	20
2.8	38
0.7	46
1.8	33
0.1	33
1.2	33
1.5	32
1.6	38
0.3	46
0.3	33
0.9	33
1.3	33
1.9	32
1.6	22
0.2	48
0.2	48
0.9	33
1.0	33
0.3	32
0.3	41
2.8	20
0.7	33
0.8	32
0.5	26
0.5	41
0.1	40
0.6	36
0.7	33
1.0	32
0.4	33
1.2	32
0.2	33
0.9	28
2.3	10
2.0	20
0.2	24
0.7	32
1.3	20
2.9	20
0.2	38
0.1	38
0.3	38
0.5	33
2.9	20
0.6	32
1.3	32
3.4	12
0.3	33
0.3	33
0.1	33
0.2	33
0.2	32
1.6	12
0.1	33
1.9	20
0.8	32
3.6	8
0.2	38
0.5	32
0.5	32
1.6	20
0.2	32
0.1	33
2.4	18
0.2	32
0.2	33
0.1	32
1.9	8
2.7	1
0.1	33
0.9	20
1.4	20
1.3	20
1.3	22
0.2	32
0.2	32
0.7	32
3.2	1
2.0	16
1.8	18
1.4	16
1.7	13
0.1	33
0.3	33
1.6	17
2.4	20
0.8	33
0.9	20
0.9	20
1.8	8
0.1	24
1.8	8
0.8	20
0.3	24
1.2	20
1.1	28
0.9	20
1.2	20
1.5	22
0.3	32
1.3	16
1.5	18
1.0	18
0.7	17
1.7	4
0.7	18
1.8	14
0.8	20
1.0	26
1.9	4
0.9	20
0.3	20
0.1	20
0.5	21
1.9	8
0.7	20
0.6	20
0.2	21
0.8	20
0.9	20
2.1	16
1.1	18
0.5	22
1.8	22
0.5	21
0.5	22
0.2	26
0.9	18
0.5	22
0.6	20
0.9	20
1.4	20
1.4	20
1.1	16
0.1	32
0.9	20
0.5	21
0.8	17
1.0	8
1.1	14
0.4	17
2.3	8
0.5	8