If you planning to travel to Castle Rock Park, Walnut Creek, 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 3:20 PM. The temperature feels like 54.5 with a humidity level of 88 so dress accordingly. Cloud coverage is 89 percent with visibility at 6 percent. Today’s UV index is 0, don’t forget the sunscreen if you need it! Today’s winds are traveling south-southeast at a speed of 4 MPH. At the end of the day don’t miss the sunset at 12:52 AM.