Or at least that's what the forecast predicts for Canberra and the surrounding region over the weekend and into early next week.

The temperature nudged up to 31 degrees on Thursday afternoon, and is expected to hit 30 degrees on Friday, which would be the first time Canberra has had consecutive days over 30 since February.

According to the Bureau of Meteorology's Sean Carson, the double dose of sun could include a summery storm late on Friday. ''It's going to have some high cloud around, so it won't be as picture perfect as [Thursday],'' he said.

''There could even be a light shower around early in the morning but, certainly into [Friday] evening, a shower or thunderstorm could be likely.''

But just as those summer-inspired conditions reach their peak, another weather system is set to roll in, bringing rain, possible snow to the Snowy Mountains, and a drop in temperature that could leave maximums halved to the mid-teens.

Mr Carson said a trough would move over the eastern part of the country on the weekend, creating scattered showers on Saturday and the possibility of up to 20 millimetres of rainfall during Sunday and Monday as the system from the west met cool air from the south.

''Once it gets to eastern parts of NSW we're then hoping that a high-pressure system located further south will basically drag some moisture in from the Tasman Sea and feed into the trough and then, hopefully, it will flare up and produce some more rainfall,'' he said.

If it comes in the right places, Mr Carson said the rain could also help douse the bushfires still smouldering between the Great Dividing Range and the east coast.

But the change will also force temperatures down significantly in Canberra. The bureau forecast for Monday, at the time of writing, had a forecast top of just 15 degrees - half the 30 degrees expected for Friday.

Mr Carson said while it would definitely cool down, that forecast was likely to be revised upwards towards the high teens as Monday approached. ''It's a slightly cooler air mass moving in from the south, and then you throw in the influence of cloud and rain on the top of it, it obviously suppresses the temperature a bit,'' he said.

With the cool air comes the chance of a dusting of late-season snow for the upper peaks of the Snowy Mountains, but Mr Carson said it would not be a huge snow event.

The temperature is set to creep up again from Monday, with some showers expected to linger through to the middle of next week.

This weekend, Canberra's pools will fling their doors open, ready for summer. The Big Splash water park at Macquarie opens on Saturday with an opening weekend two-for-one all-day slide ticket special.