Thursday 26th June 2025

More heat incoming, and there’s still a chance of breaking the June record on the last day of June.

Thanks to Debs for the photograph.

So the general picture sees the westerly flow abating as the Azores High starts to build from the south-west, and as it does, taps into the European heatwave.

We start Thursday with a weak weather front crossing, mostly bringing cloud (though some sunny breaks), and probably the odd splash of rain, a small chance of a heavy (ish) shower. It will gradually brighten up from early afternoon with increasing amounts of sunshine. Breezy, verging on quite windy in the afternoon, still very warm, around 24’C, maybe a shade more. A mostly cloudy night, perhaps some showery rain after midnight. Down to around 13’C.

Friday sees the Azores high ridging in more, though with weather fronts not far from our north-west there will be some cloud at times, and some uncertainty as to how much. So generally a mixed picture of at least some cloud, and some hazy sunshine – with more emphasis on sunshine later in the day. Very warm though temperatures will depend on how much cloud cover there is, 26’C feels more likely but it could be a couple either side. Clear spells at first overnight though a lot of cloud arriving later, which will mean a warmish night, say around 18’C.

Saturday starts cloudy but finishes sunny. There is uncertainty as to when the cloud starts to break up, it could break up during the morning, if so we’ll get to around 29’C, maybe 30’C, if it doesn’t start breaking up until the afternoon then 26’C to 27’C is more likely. Reasonably clear skies overnight, down to around 16’C.

By Sunday, high pressure is very much in control and tapping into the heat to our south.

Good spells of sunshine for most of the day, though some bits of cloud around. Hot, we should get to 30’C, I wouldn’t rule out 32’C. Mostly clear skies overnight, eventually down to around 18’C.

Monday is probably the peak of this heatwave (there will be more this summer!), with long spells of sunshine for most of the day, though maybe a 5% chance of a thundery downpour developing later in the afternoon. It will be hot, somewhere between 30’C and 33’C more likely, but I wouldn’t rule out anything up to 36’C at this stage. A warm night likely, around 20’C. Yuck.

Tuesday is more uncertain, possible that the heat can hang on another day (30% chance approximately), but somewhat more likely is a weak weather front brings some cloud across at some point, sunshine at times too, and less hot conditions after the band of cloud clears. Temperatures could be anywhere from 25’C to 35’C, depending on when the very weak weather front arrives.

Pretty low confidence after that, though probably the heat will have subsided, and we’ll have temperatures back in the 24’C to 28’C range, with reasonably sunny days more likely than anything else.

A chance that a thundery low could develop over France next week and end up bringing us a spell of thundery rain at some point, either as a heatwave-ender on Tuesday/Wednesday, or just later in the week, but it isn’t an especially high chance as it stands.

Also I would be surprised if we don’t end up with another short-lasting heatwave in the first half of July, maybe around 8th July is a date to watch.

Have a pleasant weekend. Next forecast will probably be on Sunday morning.