Category: Extremes affecting Malaysia

Heat wave occuring from December 16 2025 to December 20 2025 at -0.5°S 111.5°E

Download data: JSON

Event type: Heat wave

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

  • Indonesia
  • Malaysia

Duration: 5 days

Time span: December 16 2025 to December 20 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 1.2 °C
  • Mean temperature: 26.8 °C
  • Maximum temperature anomaly: 1.7 °C
  • Maximum temperature: 28.0 °C

Event center: -0.5°S 111.5°E

Area affected: 67992 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-Dec-16_to_2025-Dec-20_111.5_-0.5

Cold spell occuring from December 12 2025 to December 17 2025 at 2.5°N 99.0°E

Download data: JSON

Event type: Cold spell

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

  • Indonesia
  • Malaysia

Duration: 6 days

Time span: December 12 2025 to December 17 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -1.3 °C
  • Mean temperature: 24.6 °C
  • Minimum temperature anomaly: -2.2 °C
  • Minimum temperature: 20.4 °C

Event center: 2.5°N 99.0°E

Area affected: 148303 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-Dec-12_to_2025-Dec-17_99.0_2.5

Heat wave occuring from December 02 2025 to January 02 2026 at -8.5°S 110.0°E

Download data: JSON

Event type: Heat wave

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

  • Australia
  • India
  • Indonesia
  • Malaysia

Duration: 32 days

Time span: December 02 2025 to January 02 2026

Statistics over entire affected area:

  • Mean temperature anomaly: 1.3 °C
  • Mean temperature: 28.0 °C
  • Maximum temperature anomaly: 7.3 °C
  • Maximum temperature: 39.1 °C

Event center: -8.5°S 110.0°E

Area affected: 4683354 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-Dec-02_to_2026-Jan-02_110.0_-8.5

Heat wave occuring from November 29 2025 to December 05 2025 at 4.5°N 102.5°E

Download data: JSON

Event type: Heat wave

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

  • Indonesia
  • Malaysia
  • Thailand

Duration: 7 days

Time span: November 29 2025 to December 05 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 1.2 °C
  • Mean temperature: 26.9 °C
  • Maximum temperature anomaly: 2.5 °C
  • Maximum temperature: 28.1 °C

Event center: 4.5°N 102.5°E

Area affected: 150931 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-Nov-29_to_2025-Dec-05_102.5_4.5

Heat wave occuring from November 26 2025 to December 04 2025 at 7.0°N 117.5°E

Download data: JSON

Event type: Heat wave

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

  • Malaysia
  • Philippines

Duration: 9 days

Time span: November 26 2025 to December 04 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 1.2 °C
  • Mean temperature: 28.1 °C
  • Maximum temperature anomaly: 1.9 °C
  • Maximum temperature: 28.7 °C

Event center: 7.0°N 117.5°E

Area affected: 205410 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-Nov-26_to_2025-Dec-04_117.5_7.0

Heat wave occuring from November 15 2025 to November 17 2025 at 4.5°N 119.5°E

Download data: JSON

Event type: Heat wave

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

  • Malaysia
  • Philippines

Duration: 3 days

Time span: November 15 2025 to November 17 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 1.0 °C
  • Mean temperature: 28.0 °C
  • Maximum temperature anomaly: 1.6 °C
  • Maximum temperature: 28.6 °C

Event center: 4.5°N 119.5°E

Area affected: 95360 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-Nov-15_to_2025-Nov-17_119.5_4.5

Heat wave occuring from October 10 2025 to October 16 2025 at 6.0°N 111.0°E

Download data: JSON

Event type: Heat wave

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

  • Brunei Darussalam
  • Malaysia

Duration: 7 days

Time span: October 10 2025 to October 16 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 1.2 °C
  • Mean temperature: 28.3 °C
  • Maximum temperature anomaly: 2.5 °C
  • Maximum temperature: 29.0 °C

Event center: 6.0°N 111.0°E

Area affected: 365873 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-10_to_2025-Oct-16_111.0_6.0

Cold spell occuring from October 04 2025 to October 08 2025 at 5.0°N 116.5°E

Download data: JSON

Event type: Cold spell

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

  • Indonesia
  • Malaysia

Duration: 5 days

Time span: October 04 2025 to October 08 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -1.4 °C
  • Mean temperature: 22.8 °C
  • Minimum temperature anomaly: -2.4 °C
  • Minimum temperature: 18.7 °C

Event center: 5.0°N 116.5°E

Area affected: 55458 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-04_to_2025-Oct-08_116.5_5.0

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

Heat wave occuring from August 25 2025 to September 03 2025 at 0.5°N 122.0°E

Download data: JSON

Event type: Heat wave

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

  • Indonesia
  • Malaysia
  • Philippines

Duration: 10 days

Time span: August 25 2025 to September 03 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 1.0 °C
  • Mean temperature: 27.8 °C
  • Maximum temperature anomaly: 1.7 °C
  • Maximum temperature: 28.8 °C

Event center: 0.5°N 122.0°E

Area affected: 506234 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-Aug-25_to_2025-Sep-03_122.0_0.5