How to use webcams, forecasts and tide charts to pick the perfect Bay Area beach for your day out — to ensure toasty temperatures and no fog.

Scientists are tracking unseasonably large sargassum mats in the Atlantic. Where it will land, if at all, depends on winds and currents.

Massive seaweed blooms are increasingly washing onto famous tropical shorelines, turning some of the world’s most beautiful beaches into slippery, crowded tide lines—especially during warmer months.