Category: Heat waves affecting United States

14 heat waves identified in United States since 2020

Heat wave occuring from July 06 2026 to July 13 2026 at 68.5°N 219.5°E

Download data: JSON

Event type: Heat wave

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

  • Canada
  • United States

Duration: 8 days

Time span: July 06 2026 to July 13 2026

Statistics over entire affected area:

  • Mean temperature anomaly: 5.6 °C
  • Mean temperature: 17.3 °C
  • Maximum temperature anomaly: 10.8 °C
  • Maximum temperature: 23.0 °C

Event center: 68.5°N 219.5°E

Area affected: 211323 km$^2$



Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Heat_wave_2026-Jul-06_to_2026-Jul-13_219.5_68.5

Heat wave occuring from June 21 2026 to June 29 2026 at 28.5°N 257.5°E

Download data: JSON

Event type: Heat wave

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

  • Mexico
  • United States

Duration: 9 days

Time span: June 21 2026 to June 29 2026

Statistics over entire affected area:

  • Mean temperature anomaly: 3.7 °C
  • Mean temperature: 31.2 °C
  • Maximum temperature anomaly: 5.9 °C
  • Maximum temperature: 35.7 °C

Event center: 28.5°N 257.5°E

Area affected: 355234 km$^2$


Fig. 1: Map of most extreme temperature anomalies (standardized) experienced during the event. The purple star indicates the center of the extreme event. Green hatching illustrates all areas under the effect of extremes at some time during the event.



Fig. 2: Evolution of temperature at the center of the event. The climatological percentile distribution is illustrated with color shadings.



Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Heat_wave_2026-Jun-21_to_2026-Jun-29_257.5_28.5

Heat wave occuring from June 20 2026 to June 27 2026 at 64.5°N 199.0°E

Download data: JSON

Event type: Heat wave

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

  • United States

Duration: 8 days

Time span: June 20 2026 to June 27 2026

Statistics over entire affected area:

  • Mean temperature anomaly: 5.2 °C
  • Mean temperature: 17.2 °C
  • Maximum temperature anomaly: 8.6 °C
  • Maximum temperature: 23.2 °C

Event center: 64.5°N 199.0°E

Area affected: 285758 km$^2$


Fig. 1: Map of most extreme temperature anomalies (standardized) experienced during the event. The purple star indicates the center of the extreme event. Green hatching illustrates all areas under the effect of extremes at some time during the event.



Fig. 2: Evolution of temperature at the center of the event. The climatological percentile distribution is illustrated with color shadings.



Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Heat_wave_2026-Jun-20_to_2026-Jun-27_199.0_64.5

Heat wave occuring from June 18 2026 to June 25 2026 at 48.0°N 237.5°E

Download data: JSON

Event type: Heat wave

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

  • Canada
  • United States

Duration: 8 days

Time span: June 18 2026 to June 25 2026

Statistics over entire affected area:

  • Mean temperature anomaly: 5.0 °C
  • Mean temperature: 17.0 °C
  • Maximum temperature anomaly: 8.5 °C
  • Maximum temperature: 25.3 °C

Event center: 48.0°N 237.5°E

Area affected: 257348 km$^2$



Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Heat_wave_2026-Jun-18_to_2026-Jun-25_237.5_48.0

Heat wave occuring from June 08 2026 to June 13 2026 at 33.5°N 269.5°E

Download data: JSON

Event type: Heat wave

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

  • United States

Duration: 6 days

Time span: June 08 2026 to June 13 2026

Statistics over entire affected area:

  • Mean temperature anomaly: 3.6 °C
  • Mean temperature: 28.6 °C
  • Maximum temperature anomaly: 5.2 °C
  • Maximum temperature: 30.4 °C

Event center: 33.5°N 269.5°E

Area affected: 277554 km$^2$



Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Heat_wave_2026-Jun-08_to_2026-Jun-13_269.5_33.5

Heat wave occuring from June 08 2026 to June 11 2026 at 37.0°N 261.0°E

Download data: JSON

Event type: Heat wave

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

  • United States

Duration: 4 days

Time span: June 08 2026 to June 11 2026

Statistics over entire affected area:

  • Mean temperature anomaly: 5.5 °C
  • Mean temperature: 29.2 °C
  • Maximum temperature anomaly: 7.2 °C
  • Maximum temperature: 31.0 °C

Event center: 37.0°N 261.0°E

Area affected: 86781 km$^2$



Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Heat_wave_2026-Jun-08_to_2026-Jun-11_261.0_37.0

Heat wave occuring from June 03 2026 to June 13 2026 at 39.5°N 253.5°E

Download data: JSON

Event type: Heat wave

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

  • United States

Duration: 11 days

Time span: June 03 2026 to June 13 2026

Statistics over entire affected area:

  • Mean temperature anomaly: 5.0 °C
  • Mean temperature: 18.0 °C
  • Maximum temperature anomaly: 7.5 °C
  • Maximum temperature: 26.0 °C

Event center: 39.5°N 253.5°E

Area affected: 122772 km$^2$



Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Heat_wave_2026-Jun-03_to_2026-Jun-13_253.5_39.5

Heat wave occuring from June 02 2026 to June 06 2026 at 61.5°N 210.5°E

Download data: JSON

Event type: Heat wave

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

  • Canada
  • United States

Duration: 5 days

Time span: June 02 2026 to June 06 2026

Statistics over entire affected area:

  • Mean temperature anomaly: 4.8 °C
  • Mean temperature: 11.7 °C
  • Maximum temperature anomaly: 8.3 °C
  • Maximum temperature: 18.9 °C

Event center: 61.5°N 210.5°E

Area affected: 179202 km$^2$



Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Heat_wave_2026-Jun-02_to_2026-Jun-06_210.5_61.5

Heat wave occuring from June 02 2026 to June 09 2026 at 60.0°N 197.5°E

Download data: JSON

Event type: Heat wave

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

  • United States

Duration: 8 days

Time span: June 02 2026 to June 09 2026

Statistics over entire affected area:

  • Mean temperature anomaly: 4.8 °C
  • Mean temperature: 13.2 °C
  • Maximum temperature anomaly: 9.1 °C
  • Maximum temperature: 18.8 °C

Event center: 60.0°N 197.5°E

Area affected: 148319 km$^2$



Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Heat_wave_2026-Jun-02_to_2026-Jun-09_197.5_60.0

Heat wave occuring from May 30 2026 to June 02 2026 at 34.5°N 263.5°E

Download data: JSON

Event type: Heat wave

Countries affected (identified with ArcGIS Online; provided only for geographical reference):

  • United States

Duration: 4 days

Time span: May 30 2026 to June 02 2026

Statistics over entire affected area:

  • Mean temperature anomaly: 4.0 °C
  • Mean temperature: 28.3 °C
  • Maximum temperature anomaly: 5.7 °C
  • Maximum temperature: 30.1 °C

Event center: 34.5°N 263.5°E

Area affected: 115597 km$^2$


Fig. 1: Map of most extreme temperature anomalies (standardized) experienced during the event. The purple star indicates the center of the extreme event. Green hatching illustrates all areas under the effect of extremes at some time during the event.



Fig. 2: Evolution of temperature at the center of the event. The climatological percentile distribution is illustrated with color shadings.



Fig. 3: Maps illustrating the evolution of standardized temperature anomalies during the event.

Event ID: Heat_wave_2026-May-30_to_2026-Jun-02_263.5_34.5