The UK’s record-breaking June heat is breaking down into thunderstorms, the Met Office says. Heat stresses roofing materials, and the first heavy rain afterwards exposes the faults. Check your roof from the ground now and fix anything obvious before the next downpour.
The UK has just come through its hottest June on record, and the Met Office says the heat is now breaking down into thundery showers across the country. For homeowners in Sunderland and the wider North East, that swing from days of extreme heat to sudden heavy rain is exactly the kind of weather that finds the weak spots in a roof. A few simple checks now can stop a small fault becoming a leak.
What the Met Office has said
According to the Met Office (26 June 2026), the UK provisionally recorded a new June maximum temperature for the third day running, with 37.3°C reached at Santon Downham in Suffolk. Met Office Chief Forecaster Andy Page described it as “the peak of the heatwave” and “another marker on how climate change is shifting the dial on temperature extremes in the UK”.
The Met Office added that the country is “transitioning to more of a westerly influence, bringing the risk of thunderstorms, which potentially bring multiple hazards from heavy rain, large hail, lightning and gusty winds”. Fresher conditions have been spreading from the west across the weekend, with showers reaching further south on Sunday and temperatures returning closer to average into Monday. For the North East, that means the prolonged dry heat is giving way to rain and the chance of a thundery downpour.
The short version: Weeks of extreme heat dry out and stress roofing materials. The first heavy rain after a heatwave is when hidden faults start to leak. Check your roof from the ground now, and deal with anything obvious before the next downpour.
Why a heatwave is hard on your roof
Roofs are built to shed rain, not to bake. A long spell of intense sun does several things at once. Tiles, slates, felt and flashing all expand in the heat and contract again as they cool overnight, and that repeated movement can crack old mortar, lift flashings and open up joints. Flat roofs take the worst of it: felt and bitumen can soften, blister and dry out, and UV exposure makes older coverings brittle. Sealant around chimneys, vents and rooflights can shrink and split, and timber can dry out and move slightly too.
None of this necessarily leaks while the weather stays dry. The problem shows up when the heat breaks. The first proper downpour after a heatwave drives water at every gap that has opened up, and that is when a homeowner discovers a stain on the ceiling that was not there a week ago.
What to check after the heat breaks
You can do a useful first inspection from the ground or a window without going near the roof. Please do not climb onto a roof yourself, especially after rain when surfaces are slippery. Look for:
- Slipped, cracked or missing tiles and slates, or debris in the garden after a gusty downpour.
- Lifted or peeling lead flashing around chimneys, valleys and where the roof meets a wall.
- Blisters, splits, ripples or pooling water on a flat roof, garage or extension.
- Cracked or crumbling mortar on the ridge and around the chimney.
- Gutters and downpipes that overflow in heavy rain, which can point to blockages or splits.
- Fresh damp patches, stains or peeling paint on upstairs ceilings and around chimney breasts.
If you spot any of these, it is worth getting them looked at before the unsettled spell the Met Office is forecasting for the week ahead brings more rain.
Found water coming in during a downpour? Don’t wait. Move belongings clear, put a container under the drip, and call us on 07474 701968. We offer a 24/7 emergency response across Sunderland and the North East. See what to do in a roof leak emergency for step-by-step guidance.
Flat roofs need extra attention
If you have a flat roof over an extension, dormer, garage or porch, this is the time to give it a closer look. Heat is especially tough on felt and older coverings, and a flat roof has nowhere for water to run off quickly once a fault lets it in. Blistering, soft spots and splits that opened in the heat will be tested by the first heavy rain. If yours is older or you are unsure what it is made of, our guide to EPDM vs GRP vs felt flat roofs explains the options, and we are happy to assess what you have.
How we can help
The Sunderland Roofer team is fully insured and covers Sunderland and the wider North East. Whether it is a slipped tile, tired flashing, a leaking flat roof or storm-related damage, we can inspect it and tell you honestly what does and does not need doing. You can read more about our roof repairs and emergency roofing, or learn how to spot trouble early in our guide to the signs of storm damage to your roof.
A quick check now, while the weather is changing, is the cheapest insurance you can give your home. If anything looks off, get in touch on 07474 701968 and we will take a look.