Category: Extremes affecting Thailand

Heat wave occuring from December 27 2025 to January 05 2026 at 6.0°N 100.5°E

Download data: JSON

Event type: Heat wave

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

  • Malaysia
  • Thailand

Duration: 10 days

Time span: December 27 2025 to January 05 2026

Statistics over entire affected area:

  • Mean temperature anomaly: 1.2 °C
  • Mean temperature: 27.1 °C
  • Maximum temperature anomaly: 2.5 °C
  • Maximum temperature: 29.3 °C

Event center: 6.0°N 100.5°E

Area affected: 79989 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-27_to_2026-Jan-05_100.5_6.0

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

Cold spell occuring from November 18 2025 to December 03 2025 at 19.0°N 100.5°E

Download data: JSON

Event type: Cold spell

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

  • Cambodia
  • China
  • Lao People’s Democratic Republic
  • Myanmar
  • Thailand
  • Viet Nam

Duration: 16 days

Time span: November 18 2025 to December 03 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -3.2 °C
  • Mean temperature: 19.6 °C
  • Minimum temperature anomaly: -7.6 °C
  • Minimum temperature: 5.9 °C

Event center: 19.0°N 100.5°E

Area affected: 2098929 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-Nov-18_to_2025-Dec-03_100.5_19.0

Cold spell occuring from November 17 2025 to November 26 2025 at 12.0°N 102.5°E

Download data: JSON

Event type: Cold spell

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

  • Cambodia
  • Lao People’s Democratic Republic
  • Myanmar
  • Thailand
  • Viet Nam

Duration: 10 days

Time span: November 17 2025 to November 26 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -2.7 °C
  • Mean temperature: 23.3 °C
  • Minimum temperature anomaly: -5.4 °C
  • Minimum temperature: 13.6 °C

Event center: 12.0°N 102.5°E

Area affected: 664618 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-Nov-17_to_2025-Nov-26_102.5_12.0

Heat wave occuring from September 11 2025 to September 16 2025 at 15.5°N 97.0°E

Download data: JSON

Event type: Heat wave

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

  • India
  • Myanmar
  • Thailand

Duration: 6 days

Time span: September 11 2025 to September 16 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 1.0 °C
  • Mean temperature: 27.6 °C
  • Maximum temperature anomaly: 1.6 °C
  • Maximum temperature: 28.1 °C

Event center: 15.5°N 97.0°E

Area affected: 116501 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-11_to_2025-Sep-16_97.0_15.5

Cold spell occuring from August 26 2025 to August 29 2025 at 18.5°N 98.0°E

Download data: JSON

Event type: Cold spell

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

  • Myanmar
  • Thailand

Duration: 4 days

Time span: August 26 2025 to August 29 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -1.7 °C
  • Mean temperature: 23.8 °C
  • Minimum temperature anomaly: -2.6 °C
  • Minimum temperature: 21.1 °C

Event center: 18.5°N 98.0°E

Area affected: 98929 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-Aug-26_to_2025-Aug-29_98.0_18.5

Cold spell occuring from June 08 2025 to June 13 2025 at 13.0°N 108.0°E

Download data: JSON

Event type: Cold spell

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

  • Cambodia
  • Lao People’s Democratic Republic
  • Thailand
  • Viet Nam

Duration: 6 days

Time span: June 08 2025 to June 13 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -2.2 °C
  • Mean temperature: 24.6 °C
  • Minimum temperature anomaly: -4.3 °C
  • Minimum temperature: 19.2 °C

Event center: 13.0°N 108.0°E

Area affected: 191654 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-Jun-08_to_2025-Jun-13_108.0_13.0

Heat wave occuring from June 04 2025 to June 09 2025 at 16.5°N 100.0°E

Download data: JSON

Event type: Heat wave

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

  • Lao People’s Democratic Republic
  • Thailand

Duration: 6 days

Time span: June 04 2025 to June 09 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 1.8 °C
  • Mean temperature: 29.8 °C
  • Maximum temperature anomaly: 3.0 °C
  • Maximum temperature: 32.1 °C

Event center: 16.5°N 100.0°E

Area affected: 61728 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-Jun-04_to_2025-Jun-09_100.0_16.5

Heat wave occuring from May 30 2025 to June 03 2025 at 20.0°N 103.5°E

Download data: JSON

Event type: Heat wave

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

  • Lao People’s Democratic Republic
  • Thailand
  • Viet Nam

Duration: 5 days

Time span: May 30 2025 to June 03 2025

Statistics over entire affected area:

  • Mean temperature anomaly: 2.6 °C
  • Mean temperature: 27.1 °C
  • Maximum temperature anomaly: 5.0 °C
  • Maximum temperature: 31.9 °C

Event center: 20.0°N 103.5°E

Area affected: 52323 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-May-30_to_2025-Jun-03_103.5_20.0

Cold spell occuring from May 23 2025 to May 30 2025 at 26.0°N 100.5°E

Download data: JSON

Event type: Cold spell

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

  • China
  • Lao People’s Democratic Republic
  • Myanmar
  • Thailand
  • Viet Nam

Duration: 8 days

Time span: May 23 2025 to May 30 2025

Statistics over entire affected area:

  • Mean temperature anomaly: -4.2 °C
  • Mean temperature: 19.5 °C
  • Minimum temperature anomaly: -9.5 °C
  • Minimum temperature: -1.7 °C

Event center: 26.0°N 100.5°E

Area affected: 1164357 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-May-23_to_2025-May-30_100.5_26.0