California Delta Weather - It's typically t-shirt and shorts weather in the late Spring through early Fall. You'll want to bring a sweatshirt along just in case the breezes pick up alot. Sunblock and a hat are recommended. Wintertime brings cooler temperatures with some rain and sometimes fog.
San Francisco Bay Weather - It's cool and breezy much of the year. Be prepared for chilly temperatures on most days. Surprisingly, the warmest sailing is during the winter months. So be sure to layer your clothing and bring a jacket or foul weather gear for those windy days.
For a current forecast check out this link:
