Category: Weather Extremes – all events

Heat wave occuring from September 08 2025 to September 12 2025 at 33.0°N 251.5°E

Download data: JSON

Event type: Heat wave

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

  • Mexico
  • United States

Duration: 5 days

Time span: September 08 2025 to September 12 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 3.2 °C
  • Mean temperature: 25.5 °C
  • Maximum temperature anomaly: 4.9 °C
  • Maximum temperature: 32.0 °C

Event center: 33.0°N 251.5°E

Area affected: 229169 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_2025-Sep-08_to_2025-Sep-12_251.5_33.0

Heat wave occuring from September 08 2025 to September 12 2025 at -15.0°S 125.5°E

Download data: JSON

Event type: Heat wave

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

  • Australia

Duration: 5 days

Time span: September 08 2025 to September 12 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 1.6 °C
  • Mean temperature: 27.7 °C
  • Maximum temperature anomaly: 3.5 °C
  • Maximum temperature: 29.6 °C

Event center: -15.0°S 125.5°E

Area affected: 65634 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_2025-Sep-08_to_2025-Sep-12_125.5_-15.0

Heat wave occuring from September 08 2025 to September 10 2025 at -18.5°S 22.5°E

Download data: JSON

Event type: Heat wave

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

  • Angola
  • Botswana
  • Namibia

Duration: 3 days

Time span: September 08 2025 to September 10 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 3.5 °C
  • Mean temperature: 27.0 °C
  • Maximum temperature anomaly: 4.7 °C
  • Maximum temperature: 28.3 °C

Event center: -18.5°S 22.5°E

Area affected: 61287 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_2025-Sep-08_to_2025-Sep-10_22.5_-18.5

Cold spell occuring from September 08 2025 to September 19 2025 at 35.0°N 283.5°E

Download data: JSON

Event type: Cold spell

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

  • United States

Duration: 12 days

Time span: September 08 2025 to September 19 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -2.1 °C
  • Mean temperature: 23.6 °C
  • Minimum temperature anomaly: -4.7 °C
  • Minimum temperature: 18.0 °C

Event center: 35.0°N 283.5°E

Area affected: 229815 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: Cold_spell_2025-Sep-08_to_2025-Sep-19_283.5_35.0

Cold spell occuring from September 08 2025 to September 12 2025 at -3.0°S 111.5°E

Download data: JSON

Event type: Cold spell

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

  • Indonesia

Duration: 5 days

Time span: September 08 2025 to September 12 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -0.9 °C
  • Mean temperature: 26.2 °C
  • Minimum temperature anomaly: -1.5 °C
  • Minimum temperature: 24.9 °C

Event center: -3.0°S 111.5°E

Area affected: 83289 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: Cold_spell_2025-Sep-08_to_2025-Sep-12_111.5_-3.0

Heat wave occuring from September 07 2025 to September 13 2025 at -35.5°S 21.0°E

Download data: JSON

Event type: Heat wave

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

  • South Africa

Duration: 7 days

Time span: September 07 2025 to September 13 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 2.4 °C
  • Mean temperature: 17.2 °C
  • Maximum temperature anomaly: 5.9 °C
  • Maximum temperature: 20.9 °C

Event center: -35.5°S 21.0°E

Area affected: 660111 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_2025-Sep-07_to_2025-Sep-13_21.0_-35.5

Heat wave occuring from September 07 2025 to September 11 2025 at -30.0°S 31.0°E

Download data: JSON

Event type: Heat wave

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

  • South Africa

Duration: 5 days

Time span: September 07 2025 to September 11 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 2.9 °C
  • Mean temperature: 22.1 °C
  • Maximum temperature anomaly: 7.2 °C
  • Maximum temperature: 26.3 °C

Event center: -30.0°S 31.0°E

Area affected: 87192 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_2025-Sep-07_to_2025-Sep-11_31.0_-30.0

Heat wave occuring from September 07 2025 to September 17 2025 at 3.5°N 283.0°E

Download data: JSON

Event type: Heat wave

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

  • Colombia

Duration: 11 days

Time span: September 07 2025 to September 17 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 1.0 °C
  • Mean temperature: 24.7 °C
  • Maximum temperature anomaly: 3.0 °C
  • Maximum temperature: 27.9 °C

Event center: 3.5°N 283.0°E

Area affected: 289803 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_2025-Sep-07_to_2025-Sep-17_283.0_3.5

Heat wave occuring from September 06 2025 to September 10 2025 at 14.5°N 34.0°E

Download data: JSON

Event type: Heat wave

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

  • Sudan

Duration: 5 days

Time span: September 06 2025 to September 10 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 2.3 °C
  • Mean temperature: 33.6 °C
  • Maximum temperature anomaly: 2.9 °C
  • Maximum temperature: 35.9 °C

Event center: 14.5°N 34.0°E

Area affected: 95399 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_2025-Sep-06_to_2025-Sep-10_34.0_14.5

Heat wave occuring from September 06 2025 to September 08 2025 at 27.0°N 347.0°E

Download data: JSON

Event type: Heat wave

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

  • Morocco

Duration: 3 days

Time span: September 06 2025 to September 08 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 5.2 °C
  • Mean temperature: 30.5 °C
  • Maximum temperature anomaly: 9.0 °C
  • Maximum temperature: 34.3 °C

Event center: 27.0°N 347.0°E

Area affected: 96732 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_2025-Sep-06_to_2025-Sep-08_347.0_27.0