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Built 2026-10-19 (19 October 2026)

Heat wave in United States, 25 to 28 September 2026

Heat wave in United States, 25 to 28 September 2026: 19 records at 16 stations, peak on 27 September 2026. Closed.

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

Key Facts

  • Heat wave in United States, 25 to 28 September 2026 set or tied 19 station records at 16 stations.
  • It ran from 25 September 2026 to 28 September 2026 (4 days) and its peak day was 27 September 2026.
  • Status: closed.
  • Aniak AP set a daily record high minimum temperature of 8.9 C (48.0 F) on 26 September 2026 (provisional).
  • The busiest day was 26 September 2026 with 8 records.
  • The oldest broken record in the ranked list had stood for 89 years.

Footprint

25 to 28 September 2026
Footprint of Heat wave in United States, 25 to 28 September 2026 The area covered by Heat wave in United States, 25 to 28 September 2026 is outlined, with 16 of the stations that set records marked, coloured by record type.
The area covered by Heat wave in United States, 25 to 28 September 2026 is outlined, with 16 of the stations that set records marked, coloured by record type. Made with Natural Earth.
Footprint of Heat wave in United States, 25 to 28 September 2026: stations that set records in the event
StationTypeValueDate
Aniak APRecord high minimum temperature8.9 C (48.0 F)2026-09-26
Unalakleet FldRecord high minimum temperature7.2 C (45.0 F)2026-09-26
McGrath APRecord high maximum temperature16.7 C (62.1 F)2026-09-26
Port Alsworth AlaskaRecord high minimum temperature10.0 C (50.0 F)2026-09-25
Kenai Moose PensRecord high maximum temperature16.1 C (61.0 F)2026-09-26
Klawasi AlaskaRecord high maximum temperature13.3 C (55.9 F)2026-09-27
Broadview AlaskaRecord high minimum temperature10.6 C (51.1 F)2026-09-25
Swanson River AlaskaRecord high maximum temperature16.1 C (61.0 F)2026-09-26
Salmon Trout AlaskaRecord high maximum temperature11.1 C (52.0 F)2026-09-27
Lake Minchumina AlaskaRecord high maximum temperature15.0 C (59.0 F)2026-09-27
Chatanika AlaskaRecord high maximum temperature13.3 C (55.9 F)2026-09-26
Selawik AlaskaRecord high maximum temperature12.2 C (54.0 F)2026-09-27
Ben Creek AlaskaRecord high maximum temperature12.8 C (55.0 F)2026-09-27
Kanuti Nwr AlaskaRecord high maximum temperature11.1 C (52.0 F)2026-09-27
Granite CrkRecord high minimum temperature2.8 C (37.0 F)2026-09-28
Kiana AlaskaRecord high maximum temperature12.8 C (55.0 F)2026-09-27
Innoko Flats AlaskaRecord high maximum temperature11.7 C (53.1 F)2026-09-26
Eagle Rvr 5 SERecord high maximum temperature15.6 C (60.1 F)2026-09-26
Telida AlaskaRecord high maximum temperature16.1 C (61.0 F)2026-09-26
Mt. RyanRecord high maximum temperature11.7 C (53.1 F)2026-09-26
Koyukuk Nwr AlaskaRecord high maximum temperature11.1 C (52.0 F)2026-09-27

Records per Day

Peak day 8
Records per day during Heat wave in United States, 25 to 28 September 2026 Records set or tied each day from 25 September 2026 to 28 September 2026. The most in one day was 8 on 26 September 2026. 0 2 4 6 8 09-2509-2609-2709-28
Records set or tied each day from 25 September 2026 to 28 September 2026. The most in one day was 8 on 26 September 2026.
Records per day during Heat wave in United States, 25 to 28 September 2026
DateRecords
2026-09-252
2026-09-268
2026-09-278
2026-09-281

Top Records by Margin

Margin over the record replaced
Top records of Heat wave in United States, 25 to 28 September 2026 ranked by margin
Aniak AP, 09-263.3 C (5.9 F)
Salmon Trout Alaska, 09-272.2 C (4.0 F)
Port Alsworth Alaska, 09-251.7 C (3.1 F)
Lake Minchumina Alaska, 09-271.7 C (3.1 F)
Klawasi Alaska, 09-271.6 C (2.9 F)
Chatanika Alaska, 09-271.6 C (2.9 F)
Unalakleet Fld, 09-261.1 C (2.0 F)
McGrath AP, 09-261.1 C (2.0 F)
Kenai Moose Pens, 09-261.1 C (2.0 F)
Chatanika Alaska, 09-261.1 C (2.0 F)
Selawik Alaska, 09-271.1 C (2.0 F)
Ben Creek Alaska, 09-271.1 C (2.0 F)
Granite Crk, 09-281.0 C (1.8 F)
Broadview Alaska, 09-250.6 C (1.1 F)
Salmon Trout Alaska, 09-260.6 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

Margin against age of the broken record in Heat wave in United States, 25 to 28 September 2026 19 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. 0 25 50 75 100 0.01.02.03.04.0 Margin (C) Years the old record stood
19 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, 25 to 28 September 2026
Margin (C)Years the old record stood
3.389
1.176
1.160
1.631
1.731
1.131
0.631
1.724
2.224
0.531
1.124
1.624
1.124
1.124
0.624
0.524
0.224
1.08
0.68

Compared With Other Events

Station records per event
Station records in Heat wave in United States, 25 to 28 September 2026 compared with similar events
Heat wave in United States and Mexico, 16 January to 14 February 20249,869 records
Heat wave in United States, 28 January to 24 February 20266,528 records
Heat wave in United States and Mexico, 24 May to 19 June 20205,047 records
Heat wave in United States and Mexico, 26 March to 17 April 20213,669 records
Heat wave in Germany and 49 other countries, 18 December 2021 to 15 January 20223,626 records
Heat wave in United States, 25 to 28 September 2026 (this event)19 records

Every Record Set

26 of 19
Every record set or tied during Heat wave in United States, 25 to 28 September 2026, in date order
DateStationRecordValueMarginYears stoodSignificance
2026-09-25Port Alsworth AlaskaRecord high minimum temperature (provisional)10.0 C (50.0 F)1.7 C (3.1 F)3115 of 100 (Routine)
2026-09-25Broadview AlaskaRecord high minimum temperature (provisional)10.6 C (51.1 F)0.6 C (1.1 F)3113 of 100 (Routine)
2026-09-26Aniak APRecord high minimum temperature (provisional)8.9 C (48.0 F)3.3 C (5.9 F)8943 of 100 (Notable)
2026-09-26Unalakleet FldRecord high minimum temperature (provisional)7.2 C (45.0 F)1.1 C (2.0 F)7633 of 100 (Routine)
2026-09-26McGrath APRecord high maximum temperature (provisional)16.7 C (62.1 F)1.1 C (2.0 F)6028 of 100 (Routine)
2026-09-26Kenai Moose PensRecord high maximum temperature (provisional)16.1 C (61.0 F)1.1 C (2.0 F)3115 of 100 (Routine)
2026-09-26Swanson River AlaskaRecord high maximum temperature (provisional)16.1 C (61.0 F)0.5 C (0.9 F)3113 of 100 (Routine)
2026-09-26Chatanika AlaskaRecord high maximum temperature (provisional)13.3 C (55.9 F)1.1 C (2.0 F)2412 of 100 (Routine)
2026-09-26Salmon Trout AlaskaRecord high maximum temperature (provisional)11.7 C (53.1 F)0.6 C (1.1 F)2411 of 100 (Routine)
2026-09-26Kenai Moose PensRecord high minimum temperature (provisional)6.1 C (43.0 F)0.2 C (0.4 F)2410 of 100 (Routine)
2026-09-26Innoko Flats AlaskaRecord high maximum temperature (tie) (provisional)11.7 C (53.1 F)tie313 of 100 (Routine)
2026-09-26Eagle Rvr 5 SERecord high maximum temperature (tie) (provisional)15.6 C (60.1 F)tie242 of 100 (Routine)
2026-09-26Telida AlaskaRecord high maximum temperature (tie) (provisional)16.1 C (61.0 F)tie282 of 100 (Routine)
2026-09-26Mt. RyanRecord high maximum temperature (tie) (provisional)11.7 C (53.1 F)tie242 of 100 (Routine)
2026-09-27Klawasi AlaskaRecord high maximum temperature (provisional)13.3 C (55.9 F)1.6 C (2.9 F)3115 of 100 (Routine)
2026-09-27Lake Minchumina AlaskaRecord high maximum temperature (provisional)15.0 C (59.0 F)1.7 C (3.1 F)2413 of 100 (Routine)
2026-09-27Salmon Trout AlaskaRecord high maximum temperature (provisional)11.1 C (52.0 F)2.2 C (4.0 F)2413 of 100 (Routine)
2026-09-27Chatanika AlaskaRecord high maximum temperature (provisional)13.3 C (55.9 F)1.6 C (2.9 F)2412 of 100 (Routine)
2026-09-27Selawik AlaskaRecord high maximum temperature (provisional)12.2 C (54.0 F)1.1 C (2.0 F)2412 of 100 (Routine)
2026-09-27Ben Creek AlaskaRecord high maximum temperature (provisional)12.8 C (55.0 F)1.1 C (2.0 F)2411 of 100 (Routine)
2026-09-27Kanuti Nwr AlaskaRecord high maximum temperature (provisional)11.1 C (52.0 F)0.5 C (0.9 F)2410 of 100 (Routine)
2026-09-27Kiana AlaskaRecord high maximum temperature (provisional)12.8 C (55.0 F)0.6 C (1.1 F)86 of 100 (Routine)
2026-09-27Chatanika AlaskaRecord high minimum temperature (tie) (provisional)5.0 C (41.0 F)tie242 of 100 (Routine)
2026-09-27Kenai Moose PensRecord high maximum temperature (tie) (provisional)12.2 C (54.0 F)tie242 of 100 (Routine)
2026-09-27Koyukuk Nwr AlaskaRecord high maximum temperature (tie) (provisional)11.1 C (52.0 F)tie51 of 100 (Routine)
2026-09-28Granite CrkRecord high minimum temperature (provisional)2.8 C (37.0 F)1.0 C (1.8 F)87 of 100 (Routine)

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.