Category: Weather Extremes – all events

Heat wave occuring from September 06 2025 to September 13 2025 at 1.0°N 37.0°E

Download data: JSON

Event type: Heat wave

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

  • Kenya

Duration: 8 days

Time span: September 06 2025 to September 13 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 1.5 °C
  • Mean temperature: 27.8 °C
  • Maximum temperature anomaly: 2.3 °C
  • Maximum temperature: 31.7 °C

Event center: 1.0°N 37.0°E

Area affected: 74123 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-13_37.0_1.0

Heat wave occuring from September 06 2025 to September 10 2025 at 1.0°N 43.5°E

Download data: JSON

Event type: Heat wave

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

  • Somalia

Duration: 5 days

Time span: September 06 2025 to September 10 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 1.0 °C
  • Mean temperature: 27.5 °C
  • Maximum temperature anomaly: 1.5 °C
  • Maximum temperature: 29.1 °C

Event center: 1.0°N 43.5°E

Area affected: 123551 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_43.5_1.0

Cold spell occuring from September 06 2025 to September 11 2025 at -26.5°S 115.0°E

Download data: JSON

Event type: Cold spell

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

  • Australia

Duration: 6 days

Time span: September 06 2025 to September 11 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -4.3 °C
  • Mean temperature: 12.3 °C
  • Minimum temperature anomaly: -6.3 °C
  • Minimum temperature: 7.8 °C

Event center: -26.5°S 115.0°E

Area affected: 413806 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-06_to_2025-Sep-11_115.0_-26.5

Cold spell occuring from September 06 2025 to September 16 2025 at 7.0°N 117.0°E

Download data: JSON

Event type: Cold spell

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

  • Brunei Darussalam
  • Malaysia

Duration: 11 days

Time span: September 06 2025 to September 16 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -1.2 °C
  • Mean temperature: 26.2 °C
  • Minimum temperature anomaly: -2.0 °C
  • Minimum temperature: 24.4 °C

Event center: 7.0°N 117.0°E

Area affected: 122959 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-06_to_2025-Sep-16_117.0_7.0

Cold spell occuring from September 05 2025 to September 09 2025 at -28.0°S 112.5°E

Download data: JSON

Event type: Cold spell

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

  • Australia

Duration: 5 days

Time span: September 05 2025 to September 09 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -2.0 °C
  • Mean temperature: 14.7 °C
  • Minimum temperature anomaly: -5.0 °C
  • Minimum temperature: 7.2 °C

Event center: -28.0°S 112.5°E

Area affected: 163219 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-05_to_2025-Sep-09_112.5_-28.0

Cold spell occuring from September 04 2025 to September 06 2025 at 21.0°N 1.5°E

Download data: JSON

Event type: Cold spell

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

  • Algeria
  • Mali

Duration: 3 days

Time span: September 04 2025 to September 06 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -3.1 °C
  • Mean temperature: 31.5 °C
  • Minimum temperature anomaly: -5.9 °C
  • Minimum temperature: 28.0 °C

Event center: 21.0°N 1.5°E

Area affected: 181147 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-04_to_2025-Sep-06_1.5_21.0

Heat wave occuring from September 04 2025 to September 12 2025 at 83.0°N 281.0°E

Download data: JSON

Event type: Heat wave

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

  • Canada

Duration: 9 days

Time span: September 04 2025 to September 12 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 3.6 °C
  • Mean temperature: -2.3 °C
  • Maximum temperature anomaly: 7.5 °C
  • Maximum temperature: 0.0 °C

Event center: 83.0°N 281.0°E

Area affected: 296849 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-04_to_2025-Sep-12_281.0_83.0

Heat wave occuring from September 04 2025 to September 07 2025 at 43.0°N 39.0°E

Download data: JSON

Event type: Heat wave

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

  • Russian Federation

Duration: 4 days

Time span: September 04 2025 to September 07 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 2.6 °C
  • Mean temperature: 25.3 °C
  • Maximum temperature anomaly: 3.5 °C
  • Maximum temperature: 26.5 °C

Event center: 43.0°N 39.0°E

Area affected: 59286 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-04_to_2025-Sep-07_39.0_43.0

Heat wave occuring from September 04 2025 to September 08 2025 at 8.5°N 359.0°E

Download data: JSON

Event type: Heat wave

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

  • Benin
  • Ghana
  • Nigeria
  • Togo

Duration: 5 days

Time span: September 04 2025 to September 08 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 1.4 °C
  • Mean temperature: 26.5 °C
  • Maximum temperature anomaly: 2.0 °C
  • Maximum temperature: 27.5 °C

Event center: 8.0°N 1.0°E

Area affected: 128351 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-04_to_2025-Sep-08_359.0_8.5

Cold spell occuring from September 04 2025 to September 24 2025 at -1.0°S 269.5°E

Download data: JSON

Event type: Cold spell

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

  • Ecuador

Duration: 21 days

Time span: September 04 2025 to September 24 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -1.7 °C
  • Mean temperature: 20.3 °C
  • Minimum temperature anomaly: -3.2 °C
  • Minimum temperature: 17.3 °C

Event center: -1.0°S 269.5°E

Area affected: 324459 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-04_to_2025-Sep-24_269.5_-1.0