Temperatures are dropping below the average for this time of year, as nights begin to get frosty.
The Met Office is reporting that brisk winds, showers and temperatures in single figures are making it feel autumnal. Across Merseyside, northwesterly winds and highs of just 14C will have many reaching for the big coat.
Through the week forecasters say there might be some sunny breaks but the weather will be very changeable. Overall it will be colder, temperatures as low as 4C, in the evening and early morning.
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Meteorologist Tom Morgan at the Met Office said: "The weather is set to turn colder and windier for all of us as we begin the new working week. On Monday, we see a cold front clearing the south coast of England and then a cold north-westerly flow developing across the whole of the UK.
"Some arctic air flooding southwards bringing a big drop in temperatures compared to the weekend with below average values by day. It stays quite unsettled right the way through the week with showers at times and potentially some longer spells of rain, particularly in the west.
"Rain will clear away from the southern parts of England first thing on Monday morning and then the whole of the UK will see blustery winds with a mixture of sunshine and showers through the course of the day.
"The showers potentially heavy at times, but moving through fairly quickly on those brisk north-westerly winds, which will give a marked wind chill. Temperatures potentially not getting into double figures in some parts of northern Scotland, but still around or just below average in the south.
"So taking into account of the winds on Monday and it will feel much colder than these values suggest, feeling more like two to five Celsius in northern eastern parts of Scotland so a marked wind chill for many areas."
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