Category: Extremes affecting Brazil

Heat wave occuring from October 08 2025 to October 20 2025 at -48.0°S 326.0°E

Download data: JSON

Event type: Heat wave

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

  • Argentina
  • Brazil
  • Uruguay

Duration: 13 days

Time span: October 08 2025 to October 20 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 2.8 °C
  • Mean temperature: 12.2 °C
  • Maximum temperature anomaly: 6.8 °C
  • Maximum temperature: 21.7 °C

Event center: -48.0°S 326.0°E

Area affected: 3738272 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-Oct-08_to_2025-Oct-20_326.0_-48.0

Cold spell occuring from October 07 2025 to October 09 2025 at -25.0°S 304.0°E

Download data: JSON

Event type: Cold spell

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

  • Argentina
  • Brazil
  • Paraguay

Duration: 3 days

Time span: October 07 2025 to October 09 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -5.6 °C
  • Mean temperature: 16.4 °C
  • Minimum temperature anomaly: -8.6 °C
  • Minimum temperature: 12.2 °C

Event center: -25.0°S 304.0°E

Area affected: 120196 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-Oct-07_to_2025-Oct-09_304.0_-25.0

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 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

Cold spell occuring from September 24 2025 to October 06 2025 at -9.0°S 322.0°E

Download data: JSON

Event type: Cold spell

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

  • Brazil

Duration: 13 days

Time span: September 24 2025 to October 06 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -2.3 °C
  • Mean temperature: 18.7 °C
  • Minimum temperature anomaly: -5.3 °C
  • Minimum temperature: 7.9 °C

Event center: -9.0°S 322.0°E

Area affected: 5074087 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-24_to_2025-Oct-06_322.0_-9.0

Heat wave occuring from September 24 2025 to September 27 2025 at -15.0°S 299.0°E

Download data: JSON

Event type: Heat wave

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

  • Bolivia, Plurinational State of
  • Brazil

Duration: 4 days

Time span: September 24 2025 to September 27 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 3.6 °C
  • Mean temperature: 30.0 °C
  • Maximum temperature anomaly: 4.6 °C
  • Maximum temperature: 31.9 °C

Event center: -15.0°S 299.0°E

Area affected: 56584 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-24_to_2025-Sep-27_299.0_-15.0

Heat wave occuring from September 21 2025 to September 24 2025 at -11.5°S 315.5°E

Download data: JSON

Event type: Heat wave

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

  • Brazil

Duration: 4 days

Time span: September 21 2025 to September 24 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 2.4 °C
  • Mean temperature: 29.8 °C
  • Maximum temperature anomaly: 3.9 °C
  • Maximum temperature: 32.0 °C

Event center: -11.5°S 315.5°E

Area affected: 81686 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-21_to_2025-Sep-24_315.5_-11.5

Heat wave occuring from September 21 2025 to September 24 2025 at -18.5°S 320.5°E

Download data: JSON

Event type: Heat wave

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

  • Brazil

Duration: 4 days

Time span: September 21 2025 to September 24 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 1.2 °C
  • Mean temperature: 24.6 °C
  • Maximum temperature anomaly: 1.6 °C
  • Maximum temperature: 25.2 °C

Event center: -18.5°S 320.5°E

Area affected: 81432 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-21_to_2025-Sep-24_320.5_-18.5

Heat wave occuring from September 19 2025 to September 21 2025 at -21.5°S 301.0°E

Download data: JSON

Event type: Heat wave

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

  • Bolivia, Plurinational State of
  • Brazil
  • Paraguay

Duration: 3 days

Time span: September 19 2025 to September 21 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 6.1 °C
  • Mean temperature: 32.5 °C
  • Maximum temperature anomaly: 7.8 °C
  • Maximum temperature: 34.0 °C

Event center: -21.5°S 301.0°E

Area affected: 75383 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-19_to_2025-Sep-21_301.0_-21.5

Heat wave occuring from September 10 2025 to September 15 2025 at -12.5°S 314.5°E

Download data: JSON

Event type: Heat wave

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

  • Brazil

Duration: 6 days

Time span: September 10 2025 to September 15 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 2.5 °C
  • Mean temperature: 27.6 °C
  • Maximum temperature anomaly: 4.0 °C
  • Maximum temperature: 30.0 °C

Event center: -12.5°S 314.5°E

Area affected: 66177 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-10_to_2025-Sep-15_314.5_-12.5