Weather Warning: Heavy Rain & Wind, Monday 20 to Tuesday 21 April

Apr 19, 2026 | Civil Emergency, Emergencies, News

An Orange Heavy Rain Warning is in place for Wairarapa, including Carterton, from 11am Monday 20 April to 6pm Tuesday 21 April.

Rain is expected to become persistent and heavy from Monday, with the potential for thunderstorms.

This is a long-duration weather event that may worsen over time, with a moderate chance of being upgraded to a Red Warning.

What to expect in Carterton

  • 80 to 120mm of rain expected across the district
  • Higher rainfall (150 to 250mm) in the Tararua Range, affecting river levels downstream
  • Peak rainfall rates of 15 to 25mm per hour, with isolated heavier bursts possible
  • Rain becoming more intense from Monday afternoon

Potential impacts

  • Rapidly rising streams and rivers
  • Surface flooding, particularly in low-lying areas
  • Slips and debris on rural roads
  • Hazardous driving conditions across the district

What you should do

  • Clear drains and gutters around your property
  • Avoid low-lying or flood-prone areas
  • Drive cautiously and delay travel if conditions worsen
  • Secure outdoor items and check for hazards
  • Stay up to date with official weather updates

If conditions escalate, follow advice from emergency services and Civil Defence.

Additional watches affecting the region

Heavy Rain Watch (nearby areas):
Periods of heavy rain and possible thunderstorms may affect surrounding regions, with a chance of upgrading to a warning.

Strong Wind Watch (Wellington region):
Southerly winds may approach severe gale in exposed areas from Monday afternoon into Tuesday morning.

Where to get updates

Weather and warnings

Emergency preparedness

Local information

Explainer: what an Orange Warning means

An Orange Warning means significant weather is expected. It can cause disruption and damage, and you should take steps to prepare.

A Red Warning is the highest level and means extreme weather is expected: immediate action is required.

Key timing

  • Warning period: 11am Monday 20 April to 6pm Tuesday 21 April
  • Issued: 10:20am Sunday 19 April
  • Next update: 9:00pm Sunday 19 April