Sunday July 5th
The cloud that arrived overnight on Saturday morning persisted until just after midday when it began to thin and break up allowing strong sunshine to boost the temperature to 25.1C at 15.40 being 2.3C above my long-term average. Initially, the sky was clear in the evening that allowed the temperatures to drop away to a low of 14.9C at 02.07 before cloud began to drift in again after 01.00, seen on the the back rack of the radar, that minimised any further loss and in fact saw the thermometer slowly edge upwards before rising more quickly after around 07.30 when there were breaks in the cloud that allowed bursts of sunshine to break through.
Sunday arrived with total cloud cover that by 08.00 had begin to thin and disperse that saw the temperature climb to 18.7C by 08.00, making it the warmest start to a new day for a week. As the morning progresses more lengthy, strong sunshine will begin to quickly lift the temperature, which is likely to reach the heatwave threshold of 27C this afternoon.
There is now considerable certainty that we will have to endure heatwave temperatures for at least the next week with maxima reaching into the low 30s by midweek.
The forecast track of the jet stream indicates that it will begin to loop north of the UK from Monday, referred to meteorologically as an Omega block, allowing the Azores high pressure with its accompanying hot air to dominate our weather and fend off any incursion of weather fronts from the north. There are indications that by next weekend it will begin to fragment, which is likely to mean temperatures fall away a few degrees but still well above the July average with heatwave conditions likely to last until mid-July.
Skomer Island. The Wildlife Trust of South and West Wales said 52,019 puffins were documented on Skomer Island this year – 8,000 more than in 2025.