Temperatures could climb to 30C across parts of Hawke’s Bay and Canterbury this Labour Weekend before a dramatic cold front sweeps the South Island on Monday, bringing heavy rain, strong winds, and a sharp spring contrast for holidaymakers.
Families gearing up for the long weekend face a stark meteorological split. Warm, settled weather greets holidaymakers before a drastic change arrives at the start of next week. Meteorologists warn that the country is experiencing classic spring volatility.
Warm Northwesterly Winds Drive Temperatures Toward 30C
A slow-moving high over the Tasman Sea is extending a ridge over New Zealand. This system drives warm, dry northwesterly winds across the ranges of the North Island and the Southern Alps.
Seth has your holiday weekend forecast.Saturday will be mainly dry, but also gusty and warm in several regions.Sunday will generally be similar to Saturday.Labour Day will see heavy rain reach the western and lower South Island, while the North Island stays mostly dry. pic.twitter.com/EkyfdLDlXP
MetService forecasters note that these foehn winds are pushing daytime temperatures into the mid-to-high 20s. They could potentially reach 30C in regions such as Hawke’s Bay and Canterbury.
Hastings is forecast to hit 28C. Christchurch expects 28C.
Napier is slated for 27C. Towns from Kaikōura down to Dunedin are projected to reach highs between 25C and 27C.
Drought indicator maps show that large areas are drier than usual. These regions include Waikato, Bay of Plenty, Taranaki, Tai Rāwhiti, and Hawke’s Bay.
Whangārei and Gisborne around East Cape are experiencing abnormally dry conditions with soil moisture levels well below normal. Water restrictions are already active in Hastings, Napier, Te Awamutu, Cambridge, and Wellington.
☀️ Expect a warm weekend ahead, especially for those in the north and east of the country.Clear, sunny skies combined with strengthening warm winds from the northwest 🌬️ will see some places reach for the 30s on Saturday. Both Hastings and Christchurch are currently forecast to… pic.twitter.com/XqxJiCXR3I
Earth Sciences New Zealand forecaster Chester Lampkin and MetService meteorologist John Law highlighted the escalating risks tied to the unseasonal heat. Law warned that the combination of heat, dry conditions and strengthening winds could increase the risk of fires spreading, particularly in Canterbury and Otago
.
September Rains Meet El Niño Summer Approach
The current dry anomaly sits in sharp contrast to recent wet extremes in the south. MetService meteorologist Chris Brandolino explained that the nation’s weather reflects a distinct divide.
While the lower and western South Island endured an exceptionally wet September, drought indicator maps showed a large part of the country was drier than usual. Invercargill and Gore experienced rainfall totals more than double normal levels, prompting a medium-scale adverse event classification by MPI just weeks prior.
As the holiday weekend progresses into Monday, conditions will switch back toward more quintessential El Nino weather patterns
, according to Brandolino. That transition introduces an atmospheric river of moisture targeted at the South Island, setting up the dramatic change expected to interrupt holiday travel.
Cold Front Threatens South Island Travel on Monday
A powerful cold front is forecast to sweep north across the South Island on Monday, bringing an abrupt halt to the warm holiday weather. MetService meteorologist Dom Barry described the incoming system as a bit of a spring doozy
, warning of heavy rain and strong gale-force winds affecting western and southern areas.
Rain is set to develop along the West Coast on Sunday.
The active front moves across on Monday. It drives northwest gales through Fiordland, Rakiura/Stewart Island, Southland, Clutha, and the Queenstown Lakes District.
Winds are expected to shift southerly later in the day. This pushes rain risks into Otago and Clutha while giving the Canterbury High Country much-needed moisture.
[For] anyone travelling around any of these higher South Island mountain roads, there could be some very heavy rain and very strong winds.
John Law, MetService meteorologist
Forecasters advise motorists, campers, and anyone using alpine routes on Labour Day to monitor local forecasts closely as heavy rain and strong wind watches or warnings are expected to be issued.
| Main Centre | Saturday Forecast | Sunday Forecast | Monday Forecast |
|---|---|---|---|
| Auckland | Fine, cloudy morning (12-21C) | Partly cloudy | Partly cloudy |
| Tauranga | Fine (10-22C) | Cloud clearing | Partly cloudy |
| Wellington | Partly cloudy, shower chance (13-16C) | Partly cloudy, shower chance | Rain |
| Christchurch | Fine (8-28C) | Fine | Partly cloudy with showers |
| Dunedin | Fine (9-25C) | Partly cloudy | Rain developing |
MetService meteorologist Heather Keats noted that despite the impending disruption, the pattern remains typical for the season. It does feel like it gives us whiplash and we constantly question what season we’re in,
Keats said.