Heat wave in United States, 19 August to 12 September 2025

Name: Heat wave in United States, 19 August to 12 September 2025
Start: 2025-08-19
End: 2025-09-12
Location: United States

Heat wave in United States, 19 August to 12 September 2025: 199 records at 72 stations, peak on 25 August 2025. Closed.

Data as of 2026-10-18. Last revised 18 October 2026 (2026-10-18).

Key Facts

Heat wave in United States, 19 August to 12 September 2025 set or tied 199 station records at 72 stations.
It ran from 19 August 2025 to 12 September 2025 (25 days) and its peak day was 25 August 2025.
Status: closed.
Ft Yukon set a daily record high minimum temperature of 13.3 C (55.9 F) on 26 August 2025.
The busiest day was 25 August 2025 with 24 records.
The oldest broken record in the ranked list had stood for 106 years.

Footprint

19 August to 12 September 2025

The area covered by Heat wave in United States, 19 August to 12 September 2025 is outlined, with 14 of the stations that set records marked, coloured by record type. Made with Natural Earth.

Footprint of Heat wave in United States, 19 August to 12 September 2025: stations that set records in the event
Station	Type	Value	Date
Ft Yukon	Record high minimum temperature	13.3 C (55.9 F)	2025-08-26
McKinley Park	Record high minimum temperature	11.1 C (52.0 F)	2025-08-26
Annex Creek	Record high maximum temperature	20.6 C (69.1 F)	2025-09-06
Bethel AP	Record high minimum temperature	13.3 C (55.9 F)	2025-08-24
Yakataga AP	Record high maximum temperature	18.3 C (64.9 F)	2025-09-07
Circle Hot Springs	Record high minimum temperature	10.0 C (50.0 F)	2025-09-05
Wiseman	Record high minimum temperature	9.4 C (48.9 F)	2025-08-28
Aniak AP	Record high minimum temperature	12.8 C (55.0 F)	2025-08-23
Skagway	Record high maximum temperature	24.4 C (75.9 F)	2025-08-25
Juneau AP	Record high maximum temperature	22.8 C (73.0 F)	2025-09-04
Glacier Bay	Record high minimum temperature	11.7 C (53.1 F)	2025-09-11
Elmendorf AFB	Record high minimum temperature	14.1 C (57.4 F)	2025-08-22
Cold Bay AP	Record high minimum temperature	13.3 C (55.9 F)	2025-08-24
Port Heiden	Record high minimum temperature	15.0 C (59.0 F)	2025-08-25

Records per Day

Peak day 24

Records set or tied each day from 19 August 2025 to 12 September 2025. The most in one day was 24 on 25 August 2025.

Records per day during Heat wave in United States, 19 August to 12 September 2025
Date	Records
2025-08-19	2
2025-08-21	5
2025-08-22	4
2025-08-23	5
2025-08-24	18
2025-08-25	24
2025-08-26	10
2025-08-27	10
2025-08-28	15
2025-08-29	5
2025-08-30	1
2025-08-31	1
2025-09-01	3
2025-09-02	10
2025-09-03	10
2025-09-04	24
2025-09-05	14
2025-09-06	2
2025-09-07	9
2025-09-08	7
2025-09-09	4
2025-09-10	7
2025-09-11	8
2025-09-12	1

Top Records by Margin

Margin over the record replaced

Top records of Heat wave in United States, 19 August to 12 September 2025 ranked by margin
Circle Hot Springs, 08-26	3.3 C (5.9 F)
Ft Yukon, 08-26	2.2 C (4.0 F)
Yakataga AP, 09-07	2.2 C (4.0 F)
Yakataga AP, 08-26	2.2 C (4.0 F)
Aniak AP, 08-23	1.7 C (3.1 F)
Port Heiden, 08-25	1.7 C (3.1 F)
Aniak AP, 08-25	1.6 C (2.9 F)
Elmendorf AFB, 08-29	1.4 C (2.5 F)
Elmendorf AFB, 08-22	1.3 C (2.3 F)
McKinley Park, 08-26	1.1 C (2.0 F)
Wiseman, 08-28	1.1 C (2.0 F)
Cold Bay AP, 08-24	1.1 C (2.0 F)
Annex Creek, 09-06	0.6 C (1.1 F)
Circle Hot Springs, 09-05	0.6 C (1.1 F)
Glacier Bay, 09-11	0.6 C (1.1 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

199 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 United States, 19 August to 12 September 2025
Margin (C)	Years the old record stood
2.2	106
0.6	99
1.1	95
2.2	71
0.5	94
2.2	66
0.6	90
1.1	84
0.5	84
1.7	71
3.3	62
0.6	58
0.6	83
0.5	83
1.3	75
1.6	66
0.6	74
1.7	66
1.1	72
1.4	76
2.7	62
1.7	66
0.6	68
0.6	68
0.5	76
1.0	67
0.6	72
0.5	68
0.5	68
0.6	68
0.6	71
0.5	66
0.5	68
1.1	62
0.7	68
0.6	64
2.8	38
1.1	48
1.7	35
1.2	46
0.6	62
2.2	29
1.7	5
5.0	36
0.3	60
0.6	48
0.6	44
4.5	0
0.7	52
0.5	52
1.1	51
0.5	51
0.6	48
0.6	39
0.5	29
0.5	35
3.9	28
3.3	36
2.8	38
2.4	38
0.5	46
0.5	32
2.8	30
1.2	32
2.8	20
0.3	0
0.6	38
2.2	30
0.5	30
1.9	30
1.1	23
2.2	32
1.7	34
1.7	34
1.7	31
1.7	31
1.7	36
0.1	35
0.5	20
1.7	8
2.8	8
1.7	30
1.1	32
1.2	34
0.4	43
1.5	22
1.1	8
1.2	30
2.8	20
0.6	32
1.2	30
1.6	31
1.1	32
1.1	0
2.7	16
1.1	0
1.1	31
3.3	16
0.4	34
0.4	36
0.5	35
0.5	35
0.6	36
0.8	34
0.5	32
0.6	30
0.5	23
0.5	20
1.1	12
1.1	20
0.6	32
1.1	28
2.8	8
0.5	32
0.2	34
2.4	15
1.1	4
0.6	8
0.5	26
0.5	28
2.8	16
0.6	28
1.1	24
0.6	28
0.5	28
0.5	28
0.6	28
0.1	31
1.0	22
1.5	16
0.5	20
0.6	20
0.6	7
2.2	2
1.7	8
1.1	18
1.6	18
3.9	8
1.1	20
1.7	11
1.4	12
0.6	3
0.6	4
1.1	12
1.1	18
0.6	23
0.5	20
0.6	20
0.7	16
0.5	15
2.2	8
1.7	6
0.6	8
1.1	4
1.7	6
1.1	12
2.2	2
1.2	8
1.7	3
1.6	8
1.0	8
0.6	8
1.1	6
0.5	10
0.6	6
1.1	2
1.6	2
1.1	12
1.1	7
0.6	11
1.5	8
0.9	8
1.0	8
0.5	8
0.5	12
0.2	10
0.5	11
0.5	8
0.6	2
0.5	8
0.6	8
1.1	2
0.8	4
0.6	7
1.1	6
1.1	3
1.6	3
1.1	0
0.9	6
0.6	6
0.6	6
1.1	2
0.5	6
0.5	4
0.6	6
0.6	4
0.5	2
0.3	4
0.6	2

Compared With Other Events

Station records per event

Station records in Heat wave in United States, 19 August to 12 September 2025 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 United States, 19 August to 12 September 2025 (this event)	199 records

Every Record Set

20 of 199

Every record set or tied during Heat wave in United States, 19 August to 12 September 2025, in date order
Date	Station	Record	Value	Margin	Years stood	Significance
2025-08-22	Elmendorf AFB	Record high minimum temperature	14.1 C (57.4 F)	1.3 C (2.3 F)	75	34 of 100 (Routine)
2025-08-23	Aniak AP	Record high minimum temperature	12.8 C (55.0 F)	1.7 C (3.1 F)	71	36 of 100 (Notable)
2025-08-24	Bethel AP	Record high minimum temperature	13.3 C (55.9 F)	0.5 C (0.9 F)	94	39 of 100 (Notable)
2025-08-24	Cold Bay AP	Record high minimum temperature	13.3 C (55.9 F)	1.1 C (2.0 F)	72	33 of 100 (Routine)
2025-08-25	Skagway	Record high maximum temperature	24.4 C (75.9 F)	0.5 C (0.9 F)	84	36 of 100 (Notable)
2025-08-25	Aniak AP	Record high minimum temperature	13.3 C (55.9 F)	1.6 C (2.9 F)	66	34 of 100 (Routine)
2025-08-25	Port Heiden	Record high minimum temperature	15.0 C (59.0 F)	1.7 C (3.1 F)	66	33 of 100 (Routine)
2025-08-26	Ft Yukon	Record high minimum temperature	13.3 C (55.9 F)	2.2 C (4.0 F)	106	45 of 100 (Notable)
2025-08-26	McKinley Park	Record high minimum temperature	11.1 C (52.0 F)	1.1 C (2.0 F)	95	41 of 100 (Notable)
2025-08-26	Yakataga AP	Record high maximum temperature	19.4 C (66.9 F)	2.2 C (4.0 F)	66	38 of 100 (Notable)
2025-08-26	Circle Hot Springs	Record high minimum temperature	13.3 C (55.9 F)	3.3 C (5.9 F)	62	35 of 100 (Notable)
2025-08-28	Wiseman	Record high minimum temperature	9.4 C (48.9 F)	1.1 C (2.0 F)	84	37 of 100 (Notable)
2025-08-28	McKinley Park	Record high minimum temperature	8.9 C (48.0 F)	0.6 C (1.1 F)	74	33 of 100 (Routine)
2025-08-29	Elmendorf AFB	Record high maximum temperature	23.6 C (74.5 F)	1.4 C (2.5 F)	76	33 of 100 (Routine)
2025-09-03	Juneau AP	Record high maximum temperature	23.3 C (73.9 F)	0.5 C (0.9 F)	83	34 of 100 (Routine)
2025-09-04	Juneau AP	Record high maximum temperature	22.8 C (73.0 F)	0.6 C (1.1 F)	83	35 of 100 (Notable)
2025-09-05	Circle Hot Springs	Record high minimum temperature	10.0 C (50.0 F)	0.6 C (1.1 F)	90	37 of 100 (Notable)
2025-09-06	Annex Creek	Record high maximum temperature	20.6 C (69.1 F)	0.6 C (1.1 F)	99	41 of 100 (Notable)
2025-09-07	Yakataga AP	Record high maximum temperature	18.3 C (64.9 F)	2.2 C (4.0 F)	71	39 of 100 (Notable)
2025-09-11	Glacier Bay	Record high minimum temperature	11.7 C (53.1 F)	0.6 C (1.1 F)	58	35 of 100 (Notable)

The daily ledgers keep a limited number of records per day, so this list has 20 of the 199 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 2026-10-18. 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
2.2	106
0.6	99
1.1	95
2.2	71
0.5	94
2.2	66
0.6	90
1.1	84
0.5	84
1.7	71
3.3	62
0.6	58
0.6	83
0.5	83
1.3	75
1.6	66
0.6	74
1.7	66
1.1	72
1.4	76
2.7	62
1.7	66
0.6	68
0.6	68
0.5	76
1.0	67
0.6	72
0.5	68
0.5	68
0.6	68
0.6	71
0.5	66
0.5	68
1.1	62
0.7	68
0.6	64
2.8	38
1.1	48
1.7	35
1.2	46
0.6	62
2.2	29
1.7	5
5.0	36
0.3	60
0.6	48
0.6	44
4.5	0
0.7	52
0.5	52
1.1	51
0.5	51
0.6	48
0.6	39
0.5	29
0.5	35
3.9	28
3.3	36
2.8	38
2.4	38
0.5	46
0.5	32
2.8	30
1.2	32
2.8	20
0.3	0
0.6	38
2.2	30
0.5	30
1.9	30
1.1	23
2.2	32
1.7	34
1.7	34
1.7	31
1.7	31
1.7	36
0.1	35
0.5	20
1.7	8
2.8	8
1.7	30
1.1	32
1.2	34
0.4	43
1.5	22
1.1	8
1.2	30
2.8	20
0.6	32
1.2	30
1.6	31
1.1	32
1.1	0
2.7	16
1.1	0
1.1	31
3.3	16
0.4	34
0.4	36
0.5	35
0.5	35
0.6	36
0.8	34
0.5	32
0.6	30
0.5	23
0.5	20
1.1	12
1.1	20
0.6	32
1.1	28
2.8	8
0.5	32
0.2	34
2.4	15
1.1	4
0.6	8
0.5	26
0.5	28
2.8	16
0.6	28
1.1	24
0.6	28
0.5	28
0.5	28
0.6	28
0.1	31
1.0	22
1.5	16
0.5	20
0.6	20
0.6	7
2.2	2
1.7	8
1.1	18
1.6	18
3.9	8
1.1	20
1.7	11
1.4	12
0.6	3
0.6	4
1.1	12
1.1	18
0.6	23
0.5	20
0.6	20
0.7	16
0.5	15
2.2	8
1.7	6
0.6	8
1.1	4
1.7	6
1.1	12
2.2	2
1.2	8
1.7	3
1.6	8
1.0	8
0.6	8
1.1	6
0.5	10
0.6	6
1.1	2
1.6	2
1.1	12
1.1	7
0.6	11
1.5	8
0.9	8
1.0	8
0.5	8
0.5	12
0.2	10
0.5	11
0.5	8
0.6	2
0.5	8
0.6	8
1.1	2
0.8	4
0.6	7
1.1	6
1.1	3
1.6	3
1.1	0
0.9	6
0.6	6
0.6	6
1.1	2
0.5	6
0.5	4
0.6	6
0.6	4
0.5	2
0.3	4
0.6	2

Margin (C)	Years the old record stood
2.2	106
0.6	99
1.1	95
2.2	71
0.5	94
2.2	66
0.6	90
1.1	84
0.5	84
1.7	71
3.3	62
0.6	58
0.6	83
0.5	83
1.3	75
1.6	66
0.6	74
1.7	66
1.1	72
1.4	76
2.7	62
1.7	66
0.6	68
0.6	68
0.5	76
1.0	67
0.6	72
0.5	68
0.5	68
0.6	68
0.6	71
0.5	66
0.5	68
1.1	62
0.7	68
0.6	64
2.8	38
1.1	48
1.7	35
1.2	46
0.6	62
2.2	29
1.7	5
5.0	36
0.3	60
0.6	48
0.6	44
4.5	0
0.7	52
0.5	52
1.1	51
0.5	51
0.6	48
0.6	39
0.5	29
0.5	35
3.9	28
3.3	36
2.8	38
2.4	38
0.5	46
0.5	32
2.8	30
1.2	32
2.8	20
0.3	0
0.6	38
2.2	30
0.5	30
1.9	30
1.1	23
2.2	32
1.7	34
1.7	34
1.7	31
1.7	31
1.7	36
0.1	35
0.5	20
1.7	8
2.8	8
1.7	30
1.1	32
1.2	34
0.4	43
1.5	22
1.1	8
1.2	30
2.8	20
0.6	32
1.2	30
1.6	31
1.1	32
1.1	0
2.7	16
1.1	0
1.1	31
3.3	16
0.4	34
0.4	36
0.5	35
0.5	35
0.6	36
0.8	34
0.5	32
0.6	30
0.5	23
0.5	20
1.1	12
1.1	20
0.6	32
1.1	28
2.8	8
0.5	32
0.2	34
2.4	15
1.1	4
0.6	8
0.5	26
0.5	28
2.8	16
0.6	28
1.1	24
0.6	28
0.5	28
0.5	28
0.6	28
0.1	31
1.0	22
1.5	16
0.5	20
0.6	20
0.6	7
2.2	2
1.7	8
1.1	18
1.6	18
3.9	8
1.1	20
1.7	11
1.4	12
0.6	3
0.6	4
1.1	12
1.1	18
0.6	23
0.5	20
0.6	20
0.7	16
0.5	15
2.2	8
1.7	6
0.6	8
1.1	4
1.7	6
1.1	12
2.2	2
1.2	8
1.7	3
1.6	8
1.0	8
0.6	8
1.1	6
0.5	10
0.6	6
1.1	2
1.6	2
1.1	12
1.1	7
0.6	11
1.5	8
0.9	8
1.0	8
0.5	8
0.5	12
0.2	10
0.5	11
0.5	8
0.6	2
0.5	8
0.6	8
1.1	2
0.8	4
0.6	7
1.1	6
1.1	3
1.6	3
1.1	0
0.9	6
0.6	6
0.6	6
1.1	2
0.5	6
0.5	4
0.6	6
0.6	4
0.5	2
0.3	4
0.6	2