The US state of Alaska is enjoying a rare heat wave, with temperatures topping 27C in Anchorage.

Higher temperatures have also been recorded in other parts of the state and people have been sweltering in a place where few homes have air conditioning.

Mid-June normally brings temperatures between 15C and 20C and it was still snowing in places a month ago.

State health officials have taken the unusual step of posting a Facebook message reminding people to use sunscreen.

Earlier this week, the official afternoon high in Anchorage was 27.2C, breaking the city's record set in 1926.

Weather forecasters say a high pressure system that has locked the region in clear skies and baking temperatures has shifted and should be the start of a cooling trend.