South Coast Track conditions in Jan

Hi folks,
I'll be doing my first long walk in Tassie in early Jan (with a fairly large group) - walking the South Coast Track from Melaleuca to Cockle Creek.
I know to expect a lot of mud but I'm wondering what is likely in terms of rain and cold. I keep reading warnings of the changeable weather and the possibility of days of persistent rain and sudden cold. Is this to be expected in January? Should I be assuming it could rain for the week?
I'm considering getting a much more heavy duty rain jacket but I don't know if this is overkill. I use an Aarn pack with front pockets so I'm wondering about the Water Wizard jacket/poncho system as a bit of 'bombproof' rainwear.
Any insight on the track would be great.
Thanks
I'll be doing my first long walk in Tassie in early Jan (with a fairly large group) - walking the South Coast Track from Melaleuca to Cockle Creek.
I know to expect a lot of mud but I'm wondering what is likely in terms of rain and cold. I keep reading warnings of the changeable weather and the possibility of days of persistent rain and sudden cold. Is this to be expected in January? Should I be assuming it could rain for the week?
I'm considering getting a much more heavy duty rain jacket but I don't know if this is overkill. I use an Aarn pack with front pockets so I'm wondering about the Water Wizard jacket/poncho system as a bit of 'bombproof' rainwear.
Any insight on the track would be great.
Thanks