Heavy monsoon rains in Indonesia, Sri Lanka, Thailand, and Malaysia caused widespread floods and landslides, killing at least 1,100 people.
Indonesia was the worst affected, with over 600 deaths and hundreds reported missing.
Monsoons are natural weather phenomena, but their effects can be worsened by climate change, which increases the intensity of rainfall and storms.
Monsoons are seasonal wind patterns that bring heavy rainfall to affected regions.
In November 2025, tropical cyclones combined with monsoon rains caused severe floods and landslides in Indonesia, Sri Lanka, Thailand, Malaysia, and Vietnam.
Cyclone Senyar formed just north of the equator in the Strait of Malacca, a rare event for this region.
Typhoon Koto caused flash floods in the Philippines before reaching Vietnam, and Cyclone Ditwah hit Sri Lanka.
Tropical cyclones are powerful spinning storms with strong winds and rain; they are called hurricanes in the Caribbean/North America, typhoons in East Asia, and cyclones in the Indian Ocean.
Human-caused climate change is making these storms more intense, producing heavier rainfall and stronger cyclones.