Weather: The BBC weather website offers a very easy to use and accessible weather website, where you can look at the conditions for the whole of the UK, or input a postcode to get weather conditions for that area. Forecast.co.uk is also useful an overview of UK weather conditions.
Wind Direction: An excellent website to establish wind direction is XC Weather.co.uk. This site can also can be used for weather, temperature and other conditions.
Tides: The best website for tides is TideTimes.org.uk. It provides a map of the UK and Ireland with hundreds of venues and marks highlighted by a green spot. Simply click on the venue you want to get the tides for the next 24 hours.
Sea Temperature: Sea-temperature.com lists the sea temperature at a wide range of venues around the UK.
Inshore Sea and Weather Conditions: The Met Office also has a detailed website for UK weather conditions which includes this section which focuses on weather and sea conditions in UK inshore waters. Very useful for sea anglers.