Author: WEXA

Heat wave occuring from September 27 2025 to October 09 2025 at -12.0°S 305.5°E

Download data: JSON

Event type: Heat wave

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

  • Brazil

Duration: 13 days

Time span: September 27 2025 to October 09 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 2.8 °C
  • Mean temperature: 29.6 °C
  • Maximum temperature anomaly: 5.5 °C
  • Maximum temperature: 32.9 °C

Event center: -12.0°S 305.5°E

Area affected: 845233 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-27_to_2025-Oct-09_305.5_-12.0

Heat wave occuring from September 27 2025 to November 04 2025 at 33.0°N 50.0°E

Download data: JSON

Event type: Heat wave

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

  • Afghanistan
  • Armenia
  • Azerbaijan
  • Georgia
  • Iran, Islamic Republic of
  • Iraq
  • Oman
  • Pakistan
  • Russian Federation
  • Saudi Arabia
  • Syrian Arab Republic
  • Türkiye
  • United Arab Emirates

Duration: 39 days

Time span: September 27 2025 to November 04 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 3.2 °C
  • Mean temperature: 22.8 °C
  • Maximum temperature anomaly: 8.5 °C
  • Maximum temperature: 32.7 °C

Event center: 33.0°N 50.0°E

Area affected: 2153300 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-27_to_2025-Nov-04_50.0_33.0

Cold spell occuring from September 26 2025 to October 01 2025 at 60.5°N 110.5°E

Download data: JSON

Event type: Cold spell

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

  • Russian Federation

Duration: 6 days

Time span: September 26 2025 to October 01 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -4.9 °C
  • Mean temperature: -3.9 °C
  • Minimum temperature anomaly: -7.5 °C
  • Minimum temperature: -6.2 °C

Event center: 60.5°N 110.5°E

Area affected: 110455 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-26_to_2025-Oct-01_110.5_60.5

Cold spell occuring from September 26 2025 to October 11 2025 at 67.5°N 133.5°E

Download data: JSON

Event type: Cold spell

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

  • Russian Federation

Duration: 16 days

Time span: September 26 2025 to October 11 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -8.0 °C
  • Mean temperature: -15.6 °C
  • Minimum temperature anomaly: -13.6 °C
  • Minimum temperature: -28.0 °C

Event center: 67.5°N 133.5°E

Area affected: 312841 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-26_to_2025-Oct-11_133.5_67.5

Heat wave occuring from September 26 2025 to October 02 2025 at -83.0°S 160.0°E

Download data: JSON

Event type: Heat wave

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

  • Antarctica

Duration: 7 days

Time span: September 26 2025 to October 02 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 9.2 °C
  • Mean temperature: -20.7 °C
  • Maximum temperature anomaly: 15.3 °C
  • Maximum temperature: -12.0 °C

Event center: -83.0°S 160.0°E

Area affected: 78776 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-26_to_2025-Oct-02_160.0_-83.0

Heat wave occuring from September 26 2025 to September 30 2025 at 45.5°N 80.5°E

Download data: JSON

Event type: Heat wave

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

  • China
  • Kazakhstan

Duration: 5 days

Time span: September 26 2025 to September 30 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 5.8 °C
  • Mean temperature: 18.4 °C
  • Maximum temperature anomaly: 7.4 °C
  • Maximum temperature: 22.2 °C

Event center: 45.5°N 80.5°E

Area affected: 64628 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-26_to_2025-Sep-30_80.5_45.5

Heat wave occuring from September 26 2025 to September 29 2025 at 17.0°N 343.5°E

Download data: JSON

Event type: Heat wave

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

  • Mauritania

Duration: 4 days

Time span: September 26 2025 to September 29 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 1.4 °C
  • Mean temperature: 28.8 °C
  • Maximum temperature anomaly: 4.7 °C
  • Maximum temperature: 34.2 °C

Event center: 17.0°N 343.5°E

Area affected: 226860 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-26_to_2025-Sep-29_343.5_17.0

Heat wave occuring from September 26 2025 to October 03 2025 at 4.0°N 349.5°E

Download data: JSON

Event type: Heat wave

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

  • Liberia

Duration: 8 days

Time span: September 26 2025 to October 03 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 0.7 °C
  • Mean temperature: 26.2 °C
  • Maximum temperature anomaly: 1.1 °C
  • Maximum temperature: 26.6 °C

Event center: 4.0°N 349.5°E

Area affected: 141797 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-26_to_2025-Oct-03_349.5_4.0

Heat wave occuring from September 25 2025 to October 02 2025 at -12.0°S 287.5°E

Download data: JSON

Event type: Heat wave

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

  • Bolivia, Plurinational State of
  • Peru

Duration: 8 days

Time span: September 25 2025 to October 02 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 2.7 °C
  • Mean temperature: 25.3 °C
  • Maximum temperature anomaly: 4.8 °C
  • Maximum temperature: 30.2 °C

Event center: -12.0°S 287.5°E

Area affected: 154210 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-25_to_2025-Oct-02_287.5_-12.0

Heat wave occuring from September 25 2025 to October 08 2025 at -47.0°S 311.5°E

Download data: JSON

Event type: Heat wave

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

  • Argentina
  • Brazil
  • Chile
  • Uruguay

Duration: 14 days

Time span: September 25 2025 to October 08 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 3.5 °C
  • Mean temperature: 13.0 °C
  • Maximum temperature anomaly: 11.9 °C
  • Maximum temperature: 28.9 °C

Event center: -47.0°S 311.5°E

Area affected: 6454987 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-25_to_2025-Oct-08_311.5_-47.0