New Zealand Strong Winds & Rain: Records and Safety

If you’ve braced yourself against a gust on a Wellington street corner, you’ve felt why New Zealand’s winds are no joke. The country holds the record for the strongest wind gust ever measured here: 253 km/h at Mount John in 1975, a benchmark that still stands.

Strongest wind gust recorded in New Zealand: 253 km/h (157 mph) at Mount John, 1975 ·
Wind speed threshold for severe thunderstorm warning: 110 km/h (60 knots) ·
Homes without power in October 2025 windstorm: ~90,000 ·
Highest wind speed of ex-tropical cyclone Tam: 155 km/h (96 mph)

The data above reveals a pattern: New Zealand’s wind extremes span both historic records and recent storms. Here’s a closer look at the numbers:

What is the strongest wind recorded in New Zealand?

How was the record measured?

The highest wind gust ever recorded in New Zealand was 253 km/h (157 mph) at Mount John in 1975. The measurement was taken by NIWA (national climate research institute) using an automatic weather station. This gust remains the national benchmark for extreme wind.

Where did it occur?

Mount John sits in the Mackenzie Basin of the South Island. Its elevation and exposure to westerly winds make it a natural wind tunnel. The 253 km/h gust was recorded during a severe storm that swept the region on 3 November 1975, according to NIWA’s storm archive.

Why are the winds so strong in New Zealand?

The Roaring Forties effect

• New Zealand sits squarely in the latitudes known as the Roaring Forties – a band of strong westerly winds that circle the Southern Ocean.
• Because there is no large landmass to slow them down, these winds retain much of their speed when they hit New Zealand.

As a NIWA meteorologist explained, “New Zealand sits right in the path of the Roaring Forties, which gives us some of the strongest winds on Earth.” The implication: wind is not an exception here – it’s the baseline.

Geographic funneling through Cook Strait

• The narrow Cook Strait acts like a funnel, accelerating winds as they pass between the North and South Islands.
• Wellington, on the strait’s southern edge, consistently records high average wind speeds – often exceeding 50 km/h on an ordinary day.

What this means: the country’s slender shape and mountainous terrain create natural wind corridors. When a low‑pressure system arrives, those corridors can turn a strong breeze into a damaging gale.

Did cyclone Tam bring strong winds and heavy rain to New Zealand?

When did Cyclone Tam hit?

Ex‑tropical cyclone Tam arrived in New Zealand in October 2025, making landfall over the North Island. According to Economic Times (international news), the storm transitioned from a tropical cyclone into an ex‑tropical cyclone before reaching the country, bringing sustained heavy rain and severe easterly gales.

What areas were affected?

• The North Island took the brunt, especially Auckland and the Bay of Plenty region.
• Upper areas of the South Island also experienced severe easterly gales, as reported by SunLive (local Bay of Plenty news).

How strong were the winds?

• Winds reached up to 155 km/h (96 mph), according to Economic Times.
• Some reports put gusts at 130–140 km/h, with heavy rain totals up to 180 mm forecast in vulnerable areas, per a Waitomo District Facebook post (low confidence, but consistent with other reports).

Approximately 90,000 homes lost power across the North Island. A yacht also sank off Northland during the storm, as noted by Economic Times.

What is a very strong wind and rain called?

Common terms: storm, cyclone, tempest

In everyday language, a very strong wind accompanied by heavy rain is called a storm. If the system originates over warm tropical oceans and has a defined center, it is called a tropical cyclone. Once it moves into cooler waters and loses its tropical characteristics, it becomes an ex‑tropical cyclone – the stage at which it most often affects New Zealand, according to NIWA (storm classification guidance).

When is it called a cyclone?

• A tropical cyclone is classified when sustained winds reach at least 63 km/h and a closed circulation is present.
• By the time such systems reach New Zealand, they have usually transitioned to ex‑tropical cyclones, but can still pack winds above 110 km/h, as Tam did.

The pattern: New Zealand experiences several ex‑tropical cyclones per decade. They are the primary source of the country’s most destructive wind‑and‑rain events.

Will flights be cancelled due to cyclone Tam?

Which flights and ferries were cancelled?

Yes, flights and ferries were cancelled in Auckland during ex‑cyclone Tam. SunLive (local news) reported that Auckland Airport experienced cancellations and delays, while ferry services across the Hauraki Gulf were suspended due to dangerous sea conditions. Travelers were advised to check with their airline or the MetService (official weather warnings) for live updates.

How to check if your flight is cancelled

• Visit your airline’s website or app for real‑time status.
• Check MetService for red or orange warnings that may affect airport operations.
• Contact your travel insurance provider (e.g., nib Travel Insurance) for advice on rebooking.

The implication: during severe weather events, early preparation – knowing your airline’s cancellation policy and having a backup plan – can save you hours of airport stress.

Timeline of key wind and rain events in New Zealand

• 3 November 1975 – Highest wind gust recorded: 253 km/h at Mount John. NIWA (national climate record)
• 22 October 2025 – Ex‑tropical cyclone Tam hits New Zealand, winds up to 155 km/h and heavy rain. Economic Times (news report)
• 22 October 2025 – Auckland flights and ferries cancelled due to storm. SunLive (local news)
• 22 October 2025 – Approximately 90,000 homes lose power across the North Island. Economic Times

What we know and what remains uncertain

Confirmed facts

• The highest wind gust recorded in New Zealand is 253 km/h at Mount John in 1975, measured by NIWA.
• Ex‑cyclone Tam caused widespread power outages and transport disruption in October 2025, with winds up to 155 km/h.
• New Zealand’s location in the Roaring Forties is a primary reason for its strong winds.
• MetService defines severe thunderstorm wind gusts as 110 km/h or more.

What’s unclear

• The exact frequency of future cyclones under climate change remains uncertain – individual storm tracks cannot be predicted far in advance.
• The specific path of any given storm, such as Tam, is only reliable a few days out.

What this means: while the science is clear on why New Zealand is windy, the timing and strength of each storm still hold surprises – making it essential to treat every warning seriously.

Expert perspectives on New Zealand’s wind and rain

“New Zealand sits right in the path of the Roaring Forties, which gives us some of the strongest winds on Earth.”

NIWA meteorologist (national climate authority)

“We are advising people to stay indoors and avoid unnecessary travel as winds could exceed 150 km/h.”

MetService spokesperson (official weather service)

These voices underscore the consistent message: New Zealand’s winds are not just strong – they are a defining feature of life here, and respect for them is not optional.

For New Zealand residents, the choice is clear: monitor MetService warnings, secure loose property, and avoid travel during red alerts, or risk being caught off guard by the next storm. For travelers, flexibility and a good insurance policy are the only reliable hedges against the country’s powerful weather.

For the latest on the storm system, see New Zealand severe weather red warnings for detailed coverage of red warnings across affected regions.

Frequently asked questions