Key Takeaways
- A moist, unsettled system is delivering heavy rain and squally thunderstorms to the North Island, especially Coromandel and the Bay of Plenty early today.
- Eastern upper North Island areas are expected to clear later, but rain will return in the afternoon and evening with possible hail.
- The South Island began wet, with the West Coast facing the most intense rainfall; a heavy rain warning remains for Westland District, forecasting 70–100 mm.
- Conditions should ease through the afternoon, bringing sunny spells to many regions, while southern waters may see swells up to 7 m.
- Tomorrow’s outlook calls for continued messy weather, a moderate chance of strong‑wind warnings for Southland, Clutha, Dunedin and Stewart Island, and a noticeable temperature drop as a cold southwesterly flow takes hold.
Overview of the current weather system affecting New Zealand
A deep trough of low pressure is sitting over the Tasman Sea, feeding a moist southwesterly flow across the country. This setup is generating widespread precipitation, isolated thunderstorms and gusty winds, particularly in exposed coastal and mountainous areas. Meteorologists describe the pattern as “unsettled and cold,” signalling a shift from the recent spell of warmer temperatures to a cooler, more volatile regime. The system’s influence is expected to persist through today and into tomorrow, with varying impacts from north to south as the flow evolves.
Heavy rain and squally thunderstorms over the North Island
Early this morning, the North Island is experiencing intense rainfall accompanied by squally thunderstorms. The Coromandel Peninsula and the Bay of Plenty are the focal points, where convective activity could produce brief but heavy downpours, lightning, and gusty outflows. These thunderstorms are embedded within a broader rain band that is sweeping southward from the far north, raising the risk of localized flooding and reduced visibility on roads. Residents are advised to secure outdoor objects and avoid travel through affected valleys during peak storm activity.
Clearing trends in eastern upper North Island later today
As the initial band of rain pushes westward, the eastern sectors of the upper North Island—including parts of Northland, Auckland and the Waikato—are forecast to begin clearing later in the day. Breaks in the cloud cover should allow intermittent sunshine, especially in the lee of the ranges where subsidence promotes drying. While the rain will taper, residual moisture may linger in sheltered valleys, keeping humidity relatively high. The improving conditions could provide a brief window for outdoor activities, though vigilance is still required for any lingering showers.
Afternoon‑evening rain return with possible thunderstorms and hail
Later this afternoon and into the evening, the rain is expected to make a comeback across the northern North Island. The returning moisture may revitalize the thunderstorm threat, with the potential for small hail accompanying the heavier cells. Forecast models indicate that instability will be sufficient to support brief, intense bursts of rain, especially over elevated terrain where orographic lift enhances storm development. Although the overall coverage may be less extensive than the morning’s activity, the renewed thunderstorms could still produce localized flash‑fast flooding and gusty outflows.
South Island starts wet, West Coast bears the brunt
The South Island began the day under a wet regime, with rainfall already affecting many western and southern districts. The West Coast, in particular, is bearing the brunt of the system, as moist air forced upward by the Southern Alps releases copious precipitation. Forecasts highlight a heightened risk of thunderstorms embedded within the rain band, which could intensify rainfall rates and produce occasional lightning strikes. The combination of steady rain and convective bursts raises concerns for river levels and potential landslides in steep terrain.
Heavy rain warning for Westland District and expected rainfall totals
A heavy rain warning remains in effect for the Westland District for the next hour or so, with meteorologists anticipating an additional 70 to 100 mm of rain. This amount, if realized, would significantly raise river flows and increase the likelihood of surface flooding in low‑lying communities such as Hokitika and Franz Josef. Emergency services are urging residents to monitor water levels, avoid unnecessary travel near watercourses, and prepare for possible evacuation should conditions worsen. The warning underscores the severity of the ongoing deluge in this already rain‑sensitive region.
Anticipated easing, sunny spells and sea‑state outlook
Despite the current deluge, forecasters expect conditions to begin easing for many places throughout the afternoon. As the rain band shifts eastward, breaks in the cloud cover should allow sunny spells to develop, particularly in the interior and eastern parts of both islands. Meanwhile, southern waters are forecast to experience notable swell, with heights reaching up to 7 m due to the strengthening southwesterly flow. Mariners should exercise caution, as the combination of increased swell and gusty winds could create hazardous sea conditions, especially around Stewart Island and the southern fjords.
Tomorrow’s unsettled conditions and potential strong‑wind warnings
Looking ahead to tomorrow, the weather is expected to remain messy, with a persistent southwesterly flow maintaining showers and gusty conditions across the country. There is a moderate chance that a strong wind warning will be issued for Southland, Clutha, Dunedin and Stewart Island, covering both the morning and afternoon periods. Such warnings would indicate sustained winds capable of causing minor damage to unsecured structures, making travel hazardous, and exacerbating wind‑chill effects. The continued unsettled pattern suggests that the recent warm spell has given way to a more typical late‑autumn regime.
Southwesterly flow, temperature dip and overall take‑away
The prevailing southwesterly flow is not only delivering moisture and wind but also ushering in a noticeable drop in temperatures. After a period of unusually warm weather, the shift to colder, ocean‑origin air will make the environment feel considerably chillier, especially when combined with wind and precipitation. This transition serves as a reminder of New Zealand’s volatile climate, where rapid changes from sunshine to heavy rain—and from warmth to a brisk chill—can occur within a single day. Staying informed through official forecasts and heeding any warnings will be essential for safety and comfort over the next 24‑48 hours.