Hi Diamonds,
Can be a problem with our summer (makes a change), instructions say should keep under 30˚c. But I use a Frio pouch generaly and when very hot weather, a 12v small fridge that can plug in your car on long journeys. Though my insulin pen that is in use should be left out of the fridge, according to instructions, I have had the odd one 'go off'. So perhaps just keep it cool.
If you are worried, check with your care team, temperatures may affect different types of insulin in various ways? I am on Humalog Mix 25 that seems pretty ok in warm conditions.