A Flood Alert has been issued for Thorney Island to Bracklesham, as well as Shoreham Harbour and Langstone to Emsworth Harbour today (Wednesday 28).
High water will be at 11.30am and water will be high around South Street, Emsworth and Queen Street near the Slipper Pond.
The Ship Inn car park at Langstone may flood and water will be high at the bottom of Langstone high street.
At high tide water will also flood Shore Road and minor flooding impacts are expected at Bosham High Street, while Shoreside properties around Chichester Harbour could also be affected.
For updates from the Environment Agency click here
The Environment Agency said the forecast tide level at Shoreham is also high.
Around 11.15am, water will be close to the tops of the walls around town, and high up the slipways and small amounts of flooding will affect localised areas of Shoreham, including Sussex Yacht Club.
Houseboats along the Riverbank may be affected by the higher than normal tide.
The Met Office has also issued a yellow weather warning across London and South East England today.
Rain across the region will turn heavy at times this morning, before clearing northwards.
However the warning should miss West Sussex, with Kent and East Sussex affected.
For weather updates click here
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