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A relatively dry Saturday is expected to be followed by a wet and blustery Sunday. And there will be another key difference as warm air is drawn in from continental Europe.
Despite the prospect of cloud and rain, as an Atlantic moves up across the country, tomorrow’s temperatures will be similar to today’s, with highs around 22C in North Wales.
This warmer air will be accompanied by more humidity than in recent days. In its forecast for Wales, the Met Office said: “The increased humidity will make it feel more uncomfortable and sticky, especially later in the day.”
At the same time, there is the prospect of “widespread rain and the potential for strong winds”. According to the Met Office, it is “not until Sunday that the full impact of the deepening low pressure system will be felt”.
The forecaster continued: “This system will throw its fronts across the country, bringing a return to more unsettled weather.
“Sunday is expected to be the wettest and windiest day of the weekend, with widespread rain and the potential for strong winds. Sign up now for the latest news on the North Wales Live Whatsapp community
“Although relatively warm air will be drawn in, cloud and rain will limit the rise in temperatures. While on paper, temperatures could reach the mid to high 20s Celsius, this is considered unlikely. Most places will see highs in the low 20s at best.
“The low pressure system is expected to be quite deep, with central pressures potentially dropping to around 975 to 980 hPa.
“This raises the risk of strong winds, particularly in exposed areas, and further heavy rain. Rainfall totals for Sunday could reach 10 to 30 millimetres widely, with some locations possibly seeing 50 to 60 millimetres.
“There remains some uncertainty about the exact timing and location of the heaviest rain, so forecasts should be monitored closely.”
The autumnal conditions appear set to persist into next week. The Met Office said: “As we move into Monday, the UK will still be under the influence of the same low pressure centre, which is likely to be at its deepest late Sunday into Monday.
“This means the working week will start on an unsettled note, with further heavy rain and strong winds possible. The overall story remains one of unsettled weather, and this theme is set to continue through much of the week.”
Monday is expected to be fresher than Sunday as humidity levels drop back again. Sign up for the North Wales Live newsletter sent twice daily to your inbox
It’s not entirely bleak, with the Met Office forecasting a “higher than normal chance” of warm weather later in September and into October with the possibility of an ‘Indian summer’ on the horizon in parts of the UK.
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