A Flood Alert has been issued by the Environment Agency for the River Thame and Chalgrove Brook.
Flooding is possible for the River Thame from Marsworth to Dorchester including, Long Marston, Rowsham, North Ayelsbury, Cuddington, Thame, Shabbington, Ickford, Waterperry, Cuddesdon, Wheatley, Quarrendon, Drayton St Leonard, Overy, the Chalgrove Brook at Chalgrove and Stadhampton.
Low lying land and roads will be affected first.
The Environment Agency's advice is "be prepared"
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Monday night's forecast for the west of the region