Canberra's winemakers are hoping for an end to summer's extended hot streak, warning it could lead to a poor vintage.
While last year's wet winter and late spring paved the way for a tasty vintage, this could be undone by a hot or humid summer.
John Leyshon of the Canberra District Wine Association said too much hot weather could make the grapes taste more bitter.
"The problem with the heat is that the vines just shut down anything over 27-28 degrees and the vines just stop working so you're not going to get your grapes ripening," Mr Leyshon said.
Canberra sweltered through its hottest January this year, exceeding the maximum average temperature record by half a degree.
The city set an average maximum temperature of 32.8 degrees, which overtook the former mean maximum temperature record of 32.3 degrees set in 2013.
Most days in January had a maximum temperature above 30 degrees. The mercury is expected to hit 40 degrees in Canberra on Friday, and 41 degrees on Saturday.
Winemaker Frank van de Loo of Mount Majura Vineyard has noticed fewer grapes on the vine than usual, and said this could also be caused by the recent heat.
"We won't really know until we start picking but the crops are looking like they're going to be lighter," Mr van de Loo said.
Warm weather wouldn't necessarily mean a drop in quality, as long as it wasn't too hot.
"Generally the season has been very good for grapes and health of the vines," he said.
"If you have a wet winter you get fairly healthy canopies and a warm dry summer means vines grow well and you don't have disease pressure."
Despite some recent rain, Mr Leyshon said any more could be very damaging to the crop.
"If you get a lot of rain then the vines take on a lot of water and the berries will split," he said.
"After the rain this week and last week I'd be happy to see no rain until April."
For Mr van de Loo, this season mirrors past harvests that yielded little product from some of their sparkling white wine grapes.
"This year is reminding me a lot of 2014, because we also had a hot summer then," Mr van de Loo said.
"I'm really hoping the weather will cool down but I know this weekend is going to be hot again."
David Faulks of Tallagandra Hill Wines also hopes the next few weeks bring some cooler dry weather to the region.
"This has been an unusual hot streak, coming on the back of the wet in the middle of last year," Mr Faulkner said.
"We are having to irrigate a lot at the moment even though we've had a bit of rain [this week] the key is putting enough water on the vines but not too much."
Despite their concerns for this year's crop, growers are optimistic about the 2017 harvest season.
Mr Faulkner is planning to host a "stomping party" at Tallagandra Hill when their new grapes are harvested and Mr van de Loo is excited to get out and pick this year's grapes.
"You always have lots of energy and enthusiasm before it starts and by the end you're knackered," Mr van de Loo said.