Lymington Weather

Current

(only works with Internet Explorer)

Starting Platform
Hurst Castle
Yarmouth
Highcliffe SC

Forecast

Accuweather
Inshore Forecast
BBC Coastal

Tides

South Coast

Weather

Current data

Met office coastal observations (like the Shipping Forecast) updated hourly 
Satellite cloud view Brighton
Marina
Chichester Bar
Cowes Weather (wonderful)

Brambles Bank
Southampton Dock Head
Isle of Wight weather
Hurst Castle

Poole Harbour (wonderful site)

Portland Harbour

XC Weather - Wind reports for southern UK and France

British Isles Weather Buoys
Burnham Yacht Harbour