Pouring Concrete in Hot Weather

When the sun’s out and the temperature rises, pouring concrete isn’t as straightforward as it might seem. At Mister Concrete, we’ve worked through enough hot spells around London to know that summer pours can be a bit tricky if you’re not prepared. Concrete reacts differently in heat. It sets quicker, dries faster, and if you’re not careful, it can lead to surface cracks, weak spots, or just a general headache on site. But with a bit of planning and the right approach, you can still get the job done smoothly.

Here are a few tips to help you get the best results when pouring concrete on a hot day:

Be Ready and Organised

When the weather is hot, time really matters. The higher the temperature, the faster the concrete starts to set — especially if there’s wind and direct sun involved. What might be a relaxed pace on a cooler day becomes a race against the clock. Before the lorry shows up, make sure everything is in place: formwork is finished and solid, access is clear for the truck or pump, tools and people are ready. If you’re planning to wheelbarrow the mix to the back of the property or do a long slab, you’ll need enough hands on deck. We often see jobs delayed because someone wasn’t ready — and on a hot day, delays can cost you more than time. You might end up with dry patches or poor finishes just because things weren’t lined up properly.

Cool Down the Surfaces

One of the best things you can do before the pour is simply to dampen the sub-base and formwork. In hot weather, dry timber or ground will suck moisture straight out of the concrete, speeding up the setting even more. All it takes is a quick spray-down with a hose. No need to flood the area - just get it slightly wet so the surface doesn’t act like a sponge. It’s a small step that makes a big difference when it comes to workability and the finish.

Don’t Let the Surface Dry Too Fast

Once the concrete is poured and levelled, the job’s not quite done. Hot weather can pull moisture from the surface very quickly, which often leads to shrinkage cracks and a weaker top layer. What you want to avoid is leaving the concrete exposed to direct sun and wind right after finishing. If you can, keep and eye on the surface and depending on the size of the pour and the heat, lightly mist it with water now and then to slow down drying. Even just keeping it shaded for a while with boards or sheets can help. The key is keeping the surface from drying out too quickly while the concrete is still gaining strength.

Volumetric Mix Means Fresh and Flexible

With traditional drum mixers, the concrete is loaded at the plant and starts setting from the minute it’s batched. By the time it gets to your site in traffic, it may already be past its best — especially on a warm day. But with volumetric mixers, like the ones we use at Mister Concrete, the materials are kept separate and mixed fresh on site. You get a fresh batch, not one that’s been sitting on the road, and we can adjust the mix on the spot if needed. This flexibility becomes even more valuable when heat is a factor. You’re not under pressure to rush through a hot load that’s been hardening in the drum — we mix it when you’re ready.

Talk to Us Beforehand

Every site is different. Some jobs are straightforward — others need a bit of planning around access, timings, or site conditions. If you're not sure whether the weather might be an issue, give us a quick call. We’ve worked with all types of clients, from DIY jobs to big commercial pours, and we’re happy to share a bit of advice. Sometimes all it takes is shifting the time of day or having one extra person on site to make the pour go smoothly.

 

 

 

 

• by: Mister Concrete
• 2025-06-06
• 1616 views