And the former head of BBC weather presenters has urged tourism chiefs to start splashing the cash now to prepare for the influx of visitors – or risk missing out on a windfall.
Bill, 79, told the Radio Times: “We have the chance: climate change is on our side, and now is the time to start planning for it.
“We have 10 years or so to grasp the nettle and make sure that, due to climate change, we tap into the trend of warmer, more predictable summers and make the leisure and holiday industries the backbone of our post-Brexit economy.
“Now is the time for the holiday and leisure industries to gather themselves together and plough billions of pounds into updating their facilities in order to cope with the enormous potential increase in demand.
“This won’t just be from families here, people all over the world, and especially in Europe, could be seduced to come and enjoy the UK as our climate becomes more acceptable and their own becomes unbearably hot.
“But are the UK’s holiday resorts up to it? Can they give us the value for money?”
Bill played down concerns that climate change could cause serious problems for the future generations, insisting experts will have figured out how to halt it soon enough.
He added: “I’m confident that the world’s scientists will find a way of slowing climate change, perhaps by the middle of the century. In 10 or 20 years’ time, when it will be far too hot in the traditional Mediterranean resorts, most people will wish to holiday at home.
“By then the British climate will be among the best in the world.”
Meanwhile Joanna Lumley has joined a campaign calling on Brits to ditch single-use plastics altogether and opt for filtered water instead.
The Ab Fab star added: “There is no reason people should be spending their cash on bottled water when by simply adding a filter they could be opting for great-tasting, healthy tap water instead.
“I want to urge everyone to do their bit to make small changes that make a big difference… and reap huge benefits for the planet.”