Issued at 7:35am 17/09/2026

Valid from 7:35am 17/09/2026 to Midnight 17/09/2026

A front moves moves eastwards across the far south of the South Island this afternoon, with cold temperatures aloft. There is a low risk of thunderstorms for central and southern Fiordland, Stewart Island, and southern parts of Southland and Clutha, as depicted on the chart. Meanwhile, a low and frontal system, preceded by a moist northerly flow, moves onto the northern North Island later today. There is a low risk of thunderstorms for northern and eastern parts of Northland from afternoon, and a low risk of localised downpours producing rainfall rates of 25 to 40 mm/h there from evening. The low risk of thunderstorms extends southwards to include the remainder of Northland, Auckland, Great Barrier Island, Coromandel Peninsula, coastal Bay of Plenty, coastal parts of Waikato and Waitomo, and North Taranaki from evening, as drawn on the chart. There is minimal risk of thunderstorms or significant convection elsewhere in New Zealand today.

Issued at 7:12pm 17/09/2026

Valid from Midnight 17/09/2026 to Midday 18/09/2026

A low pressure system moves slowly eastwards over northern New Zealand during the first half of Friday. Throughout the morning, there is a low risk of thunderstorms for Northland, Great Barrier Island, Auckland, the north of Waikato, Coromandel Peninsula, Bay of Plenty, and the north of Gisborne/Tairawhiti, as depicted on the chart. There is minimal risk of thunderstorms or significant convection elsewhere in New Zealand during this period.

Issued at 11:04am 17/09/2026

Valid from Midday 18/09/2026 to Midnight 18/09/2026

A low pressure system over northern New Zealand moves slowly away to the east. However, residual moisture and daytime wind convergences are expected to cause showers to develop over central and northern regions. During the afternoon and evening there is mostly a low risk of thunderstorms for northern regions from Waitomo, Taumarunui, Taihape, and the ranges of Hawke's Bay and Gisborne/Tairawhiti northwards. However, for eastern parts of Northland and Auckland, Great Barrier Island, Coromandel Peninsula, Bay of Plenty, and Waikato except near the west coast, the risk is considered moderate during the afternoon, as depicted on the chart. Any thunderstorms that occur will likely be accompanied by brief heavy rain with intensities of 10 to 25 mm/h, and small hail. There is minimal risk of thunderstorms or significant convection elsewhere in New Zealand during this period.