Commuters are being urged to be vigilant because of dense fog which has hit the region.
Many of our counties are affected but warnings are in place in Berkshire around Reading and surrounding areas.
There are also warnings of patchy dense fog around Oxfordshire.
There may be large amounts of cloud at times on Wednesday, but sunny spells will occur, especially in the afternoon.
A look ahead to Monday's weather with Phillippa Drew
Phillippa Drew takes a look at Sunday's weather with a brief glance at Monday's outlook.