If you planning to travel to Castaways Marina, Sanibel, Florida, here is your 6-day travel weather forecast to make sure you have all the essentials needed during your stay. Start your day when the sunrises at 11:51 AM. The temperature feels like 69.05 with a humidity level of 65 so dress accordingly. Cloud coverage is 7 percent with visibility at 14.3 percent. Today’s UV index is 3, don’t forget the sunscreen if you need it! Today’s winds are traveling north-northwest at a speed of 20 MPH. At the end of the day don’t miss the sunset at 10:35 PM.