I have shipped hundreds of parcels during UK summers, and every year the same problems come up. Melted chocolate. Warped vinyl records. Cosmetics that arrive looking like soup. The good news is that almost all heat damage is preventable if you know what you are doing.

Summer 2026 is forecast to be another warm one, so here is everything I have learned about keeping your items safe when temperatures climb above 25 degrees.

Which Items Are Most at Risk?

Not everything suffers in the heat, but these categories need extra care: chocolate and sweets (melting point around 30-32C), candles and wax melts, cosmetics and skincare (especially SPF products), vinyl records and CDs, electronics with lithium batteries, medications, and anything with adhesive labels or stickers.

If you are shipping any of these, do not just hope for the best. A parcel sitting in a delivery van or sorting depot can easily reach 40-50C internally on a hot day.

Choose Your Shipping Day Carefully

This is the single biggest tip I can give you. Ship early in the week, Monday or Tuesday, so your parcel does not sit in a depot over the weekend. Avoid Friday dispatches during heatwaves at all costs. I have had parcels sit in warehouses for three days over a bank holiday weekend and arrive completely ruined.

Also consider the time of day. Most courier collections happen in the afternoon. If you can drop off at a courier shop first thing in the morning, your parcel spends less time in a hot van.

Insulation Actually Works

For heat-sensitive items, I use insulated foil bubble wrap. You can buy it cheaply on eBay or Amazon. Wrap the item, then place it inside your regular packaging. It is not perfect for multi-day journeys but for next-day or two-day delivery within the UK, it makes a huge difference.

For chocolate or cosmetics, frozen gel packs inside the insulated wrap can keep temperatures down for 24-36 hours. Just make sure any gel packs are properly sealed and the courier allows them.

Use Express Delivery in Summer

This might sound counterintuitive when you are trying to save money, but next-day delivery during a heatwave is actually the cheapest option. A ruined item costs you far more than the few pounds extra for express shipping. Less time in transit means less heat exposure.

Use our price comparison tool to find the cheapest next-day courier. You will often find next-day options from as little as four to five pounds for small parcels.

Mark Your Parcels Clearly

Write "HEAT SENSITIVE - KEEP OUT OF DIRECT SUNLIGHT" on the outside. Does every handler follow this? Honestly, no. But some do, and it costs you nothing. Use a thick marker and write it on at least two sides of the box.

Consider Your Packaging Colour

Dark coloured packaging absorbs more heat. If you are shipping in brown or black boxes, consider wrapping them in white paper or using a white outer box. White surfaces can be 10-15C cooler than dark ones in direct sunlight. A small thing that adds up.

Insurance for Valuable Items

If you are shipping expensive heat-sensitive items, make sure your courier insurance covers heat damage. Some policies exclude it, especially for food items. Check the terms before you book. Our insurance guide breaks down what each courier covers.

Quick Checklist for Summer Shipping

Ship Monday-Tuesday, never Friday before a hot weekend
Use next-day delivery for anything that melts
Wrap heat-sensitive items in insulated foil bubble wrap
Add frozen gel packs for chocolate, candles, or cosmetics
Use white or light-coloured outer packaging
Label clearly as heat sensitive
Drop off early morning rather than waiting for afternoon collection
Check insurance covers heat damage

Summer shipping does not have to be stressful. A bit of preparation goes a long way. And if you are comparing courier prices for your summer shipments, our free comparison tool checks 15+ couriers in seconds to find you the best deal.

Summer Shipping Tips 2026: Protect Your Parcels from the Heat