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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Regional Report weather desk. Data from national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
In hot weather, remove aerosol cans, electronics, lighters, sunglasses, and any food or drink from your car—these items can degrade, leak, or explode under high interior temperatures.
- Aerosol cans (deodorant, sun cream) can burst above 50°C, causing damage or injury
- Electronics (phones, tablets, laptops) overheat rapidly, reducing battery life and risking fire
- Disposable lighters may leak gas or explode in direct sun
- Sunglasses with plastic frames warp, and lenses may delaminate
- Food, drinks, and chocolate melt or spoil within an hour in a closed car
- Medication (especially insulin, inhalers) loses potency above 25°C
- Plastic water bottles release chemicals when heated—reuse is fine, but replace after a hot day
Why is it important to remove these items from a hot car?
Car interiors can reach 50–60°C on a sunny UK day, even with windows cracked. The heat accelerates chemical breakdown, battery leakage, and combustion risks. In extreme cases, items like lithium-ion batteries can ignite. The Met Office advises keeping cars ventilated and removing anything perishable or pressurised.
Which items are most dangerous in a hot car?
The highest-risk items are pressurised containers (aerosols, lighters) and lithium batteries (power banks, vapes). The RSPCA also warns that animals and children should never be left in a car—even for a few minutes. See the live ranking above for a comparison of item risk levels.
How quickly does a car heat up in hot weather?
On a 25°C day, the interior can reach 35°C within 10 minutes. After 30 minutes it often exceeds 45°C, even with windows slightly open. The quickest rise happens in the first 15 minutes.
Can I leave sunscreen in the glovebox?
No. Sunscreen degrades above 30°C, losing SPF protection. The active ingredients separate, making it less effective. Keep sunscreen in a cool bag or take it with you.
What should I do if an aerosol can has been left in a hot car?
Let it cool down in the shade before handling. Do not puncture or shake it. If it feels swollen or hot to the touch, leave the car windows open and dispose of it safely once cooled.
Sources
For more UK-wide guidance, see our UK weather hub or check the 10-day weather forecast before travelling. If you’re headed to a specific city, Birmingham Weather and Liverpool Weather have local details.