1. Extreme Rainfall & Flooding in South/Southeast Asia

What’s happening

Although the monsoon season normally ends by late October, the atmospheric conditions in November 2025 continue to produce:

  • Intense post-monsoon thunderstorms
  • Tropical depressions forming in the Bay of Bengal
  • Erratic pressure systems that trap moisture over land

These patterns create prolonged rainfall periods that overwhelm already saturated soil.

Key impacts
  • Flash floods occur rapidly as short bursts of heavy rain overwhelm drainage systems.
  • Urban flooding is particularly severe in major cities such as Mumbai, Dhaka, Bangkok, and Hanoi.
  • Landslides increase in Himalayan foothills due to loose, rain-soaked soil.
Why it’s happening (climate trend)

Warm sea surface temperatures in the Indian Ocean and Bay of Bengal allow storms to intensify later into the year. Warmer oceans = More evaporation = More moisture = Heavier rainfall.

2. Intensified Atlantic Hurricane Season (Late-Season Cyclones)

What’s happening

The Atlantic hurricane season is officially June–November, but in recent years, storms are forming much later. In November 2025, the Atlantic basin continues to show:

  • Late-season tropical storm formation
  • Potential hurricane-strength systems affecting the Caribbean
  • Risk of coastal flooding along the U.S. East Coast and Central America
Key impacts
  • Caribbean islands may face damaging winds, heavy rain, and storm surges.
  • Low-lying coastal regions in Florida, the Carolinas, Belize, and Honduras face flood risks.
  • Marine conditions (shipping, ports, tourism) are disrupted.
Why it’s happening (climate trend)

Ocean temperatures remain above average well into November due to long-term warming trends. This extends the hurricane season by providing the heat energy needed for:

  • Tropical depressions to form
  • Storms to intensify
  • Systems to last longer than usual

3. Extreme Temperature Swings in North America & Europe

What’s happening

Instead of steady cooling into winter, both continents experience abrupt alternating weather patterns:

  • Sudden Arctic cold blasts
  • Early winter storms
  • Short-lived warm periods (“false fall”)

This creates unpredictable temperature fluctuations within short time windows.

Key impacts
  • Energy systems experience strain as demand spikes during cold snaps.
  • Early snow leads to travel delays and dangerous road conditions.
  • Warm spells can confuse ecosystems — plants begin budding too early and wildlife migration patterns shift.
Why it’s happening (climate trend)

Rapid Arctic warming disrupts the jet stream, which normally acts like a stable conveyor belt controlling weather across the Northern Hemisphere.

A weakened, wavier jet stream:

  • Pulls Arctic air farther south
  • Allows warm air to move farther north
  • Produces sudden atmospheric swings instead of stable seasonal transitions

4. Severe Drought + Early Wildfire Activity in Australia

What’s happening

November marks late spring in Australia, a season that is becoming hotter and drier each year. In 2025, several regions experience:

  • Significant rainfall deficits
  • High temperatures
  • Dry winds increasing fire risk
Key impacts
  • Drought deepens in New South Wales, Queensland, and Western Australia.
  • Soil moisture drops, drying vegetation and fueling ignition.
  • Early bushfire outbreaks begin before the official summer fire season.
  • Heatwaves put stress on health systems and wildlife habitats.
Why it’s happening (climate trend)

Long-term warming and altered rainfall patterns push fire season earlier into the year. Higher temperatures accelerate:

  • Evaporation
  • Vegetation drying
  • Fire spread

This extends the window of wildfire activity.

5. El Niño / La Niña–Driven Weather Shifts (ENSO)

What’s happening

The El Niño–Southern Oscillation (ENSO) — the climate system in the central/eastern Pacific — influences global weather. Depending on whether El Niño or La Niña dominates late 2025, significant weather anomalies occur.

Key impacts
  • South America (Peru, Ecuador): heavy rainfall and flood risk
  • Indonesia & Australia: drought conditions intensify
  • Worldwide: temperatures swing away from expected seasonal norms
Why it’s happening (climate trend)

ENSO events are becoming more extreme and more frequent due to global warming. Warmer baseline temperatures amplify the atmospheric response:

  • El Niño tends to cause global warming spikes.
  • La Niña tends to produce stronger rainfall and hurricane activity in some regions.
  • Even modest ENSO signals can now produce outsized global effects.