Mount Aspiring

South Island, New Zealand

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Detailed Forecast

Friday 13 September – Lashings of snow and rain as a couple of fronts cross the country over the next several days



Synoptic Outlook

As I write during the moments before dawn, a cold front is inches away from passing over the Southern Lakes. Shortly after brekkie time, heavy snowfalls will pin back to snow flurries. The front will meander up the South Island and hit Canterbury this afternoon where a heavy mix of snow and rain will fall before turning to snow showers.


Fortunately for Canterbury, the front spins up into a low over the centre of the country and will dump another 10-20cm there during the second half of Saturday into the early hours of Sunday.


Meanwhile, northwesterlies on Ruapehu will see plenty of snow falling on mid-upper slopes, but rain lower down before the front brings snow showers down to base levels during the early hours of Sunday.


Another frontal system crosses the South Island during Monday. Scattered snow falls will turn to heavy rain as temps rise ahead of the front, then turn back to snow late in the day as a colder westerlies storm in.


Image of The Day

The cold front will bring a dusting of snow to the South Island today, then spin up into a low and give Canterbury an extra 10-20cm during the second half of Saturday. Source: NZ Metservice (vandalised by the Grasshopper)


Friday 13 September

Gale NW winds over the South Island change to a chilly but light southwesterly over the Southern Lakes around dawn, with heavy snowfalls pinning back to flurries this morning.


The same wind change will reach Canterbury this afternoon, turning a heavy mix of snow and rain into snow showers.


Cloud about the lower slopes of Ruapehu at first, with clear skies above. Showers developing later this morning. Strong westerly winds.


Saturday 14 September

Mainly fine and calm for the Southern Lakes, although morning low cloud may reach lower slopes.


Isolated snow flurries in Canterbury, becoming persistent during the afternoon with heavy falls possible. NE winds clock around to the south.


A rainy, wet sort of a day up Ruapehu, with snow falling above 1800m. Northerlies rise to gale during the afternoon.


Sunday 15 September

NW winds pick up over the South Island, increasing mid and high cloud over the Southern Lakes, while Canterbury will be mostly fine.


A few snow showers with westerly winds on Ruapehu


Monday 16 September

Scattered snowfalls over the Southern Lakes, turning to rain later in the morning. Heavy rain from late afternoon as strong NW winds rise to gale, but snow levels will gradually drop below base levels during the evening.


Scattered rain and snow spreading over Canterbury during the morning, turning to heavy rain in the afternoon. Gale-severe gale NW winds.


Partially cloudy on Ruapehu, mostly about lower slopes, with plenty of sunshine above. Stiff westerly winds.


Extended Outlook

The frontal system will continue over the North Island during Tuesday with nothing but wet ol rain falling on Ruapehu. Meanwhile, strong, freezing westerlies over the South Island should scatter snowfalls over the Southern Lakes.


High pressure in the Tasman Sea approaches later on Wednesday and will take the country under its wing during Thursday through into next Saturday, providing nice settled conditions.


That’s all from the Grasshopper. Wanna keep your finger on the pulse of all things snow? Join my weekly email list by filling in the box below. If you have a question or feedback for me, hit me up on facebook.



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