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 11:54 AM. The temperature feels like 69.80000000000001 with a humidity level of 70 so dress accordingly. Cloud coverage is 4 percent with visibility at 12.5 percent. Today’s UV index is 5, don’t forget the sunscreen if you need it! Today’s winds are traveling east at a speed of 9 MPH. At the end of the day don’t miss the sunset at 10:35 PM.