Weather4D
SailGrib WR
Satellite-based Sargassum Watch System (SaWS)
Weather Underground
Good marine weather section worldwide, news and blogs and severe weather information. http://www.wunderground.com/
Ventusky
Commercial Marine Weather Service Websites https://www.ventusky.com/
South Pacific – MetBob
Bob McDavitt’s ideas for sailing around the South Pacific. Free info. Useful weathergrams. In tune with rallies and events running through the Pacific which can help with timings. https://metbob.wordpress.com/