Despite the weather cooling down a little, the RSPCA says it's bracing itself for more calls about pets trapped in hot vehicles...
The charity received around 2,000 reports from concerned animal-lovers in June.
Every year, they see a surge in calls in July - with call-handlers dealing with more than 1,600 calls in the peak summer month in 2016, 18% more reports than any other month.
In total last year, they were called more than 150 times in Hertfordshire, 103 in Buckinghamshire and 66 in Bedfordshire.
The majority of calls relate to dogs - often left in cars, caravans or vans on warm days - but the charity also receives concerns about other animals suffering in the heat, from horses to farm animals to fish.
Suzanne Norbury from the RSPCA has been analysing the figures and says it's not just hot cars and vans they're worried about: "It's important to remember not to leave any animal in a car or caravan, or in a conservatory or outbuilding, where temperatures can quickly rise, even when it doesn't feel that warm outside.
For example, when it's 22C outside, within an hour the temperature can reach 47C inside a vehicle, which can result in death.
In an emergency, the group's advice is to call 999 to report a dog in a hot car to police.
As a charity, the RSPCA may not be able to attend quickly enough and, with no powers of entry, we'd need police assistance at such an incident".