Here's James Wright with your forecast in the south and Thames Valley:
And your forecast for the southeast:
Tonight: Generally cloudy during the evening and overnight with occasional drizzle, and misty conditions developing on coasts and hills. Sometimes brisk southerly winds. Minimum temperature 7 °C.
Monday: Generally cloudy, although perhaps locally bright for a time in northwestern areas.
Intermittent rain or drizzle is likely at times, more especially later. Continuing mild with brisk southerly winds. Maximum temperature 12 °C.
Outlook for Tuesday to Thursday: Mainly dry, sometimes sunny on Tuesday after chilly start, then cloudier later.
Mild on Wednesday and Thursday with variable cloud and sunny intervals, but locally chilly, misty nights