Long-range forecasts revealed clear weather in the south would prompt overnight fog before an unseasonable chill sets in.
The Met Office forecast for September 9 to 18 predict the mercury will dip “a little cooler”.
The forecast reads: “A mainly settled start is expected for this period in the south of the UK with fine and dry weather.
“Although, with clearer skies and lighter winds, mist or fog may form on some nights.
“More unsettled spells of weather are expected in the north of the UK with rain and strong winds for many, with a risk of this pushing further south at times.
“Temperatures should be around average for the time of year, however it may be a little cooler than such for some.”