If you planning to travel to Castaic Lake, Castaic, California, 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 1:42 PM. The temperature feels like 84 with a humidity level of 30 so dress accordingly. Cloud coverage is 3 percent with visibility at 15 percent. Today’s UV index is 8, don’t forget the sunscreen if you need it! Today’s winds are traveling south-southeast at a speed of 6 MPH. At the end of the day don’t miss the sunset at 1:50 AM.