The following websites can help you before starting your journeys, because it can offer you a fairly reliable weather information.
AEMET Estate Meteorological Agency. It is advisable to always keep in mind.
WINDGURU This web site has an application it´s able to make a prediction of waves, wind and temperature in almost any area of the world and up to one week in advance.
OCEANWEATHER Can provides you a global weather forecasts, regional winds, currents and sea temperatures.
PASSAGEWEATHER Forecast wind, waves and weather.