Last Update: 04/05/2026 at 2:50 PM EST
New Zealand Faces Heavier Rainfall
Coverage from The Conversation, Phys, and others
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Latest Article
04/02
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Executive Summary
Studies project more intense and frequent extreme rainfall across New Zealand by late century, raising flood risk as warming loads the atmosphere with more moisture.
- Extreme one-day and three-day rainfall is projected to intensify and become more frequent across much of New Zealand
- By the second half of the century, the strongest events may rise about 10% to 20%
- The biggest increases are expected in the central North Island and parts of the South Island west coast
- Some eastern areas including Hawke's Bay and parts of Canterbury may see smaller or variable changes
- Under about 2.7 C warming, half of studied locations could see at least 50% more impactful rainfall events
- Around 30% of locations could see rainfall events double and about 10% could see them triple
- Atmospheric rivers are projected to transport more moisture and play a larger role in extreme rainfall
Quick Facts
- What: Project stronger and more frequent extreme rainfall
- Where: Across much of New Zealand and nearby South Pacific
- Why: Warmer air holds more moisture, worsening flood risk
- Who: New Zealand researchers and climate model studies
- When: By the second half of this century
Coverage Timeline: 682 Days
Featured Article
New Zealand climate projections indicate mid-to-late-century increases in extreme one-day and three-day rainfall, with emissions-driven regional intensification affecting flood planning.
Additional Articles
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A New Zealand climate study using Ministry for the Environment projections projects 10% to 20% increases in extreme one- and three-day rainfall by the late century, especially in the central North Island and South Island west coast.
Atmospheric river projections from 12 km downscaled CMIP6 simulations suggest stronger moisture transport and more frequent extreme events over New Zealand by end of century.