If you planning to travel to Oso Flaco Lake, Arroyo Grande, 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 2:30 PM. The temperature feels like 51.8 with a humidity level of 60 so dress accordingly. Cloud coverage is 7 percent with visibility at 14.7 percent. Today’s UV index is 3, don’t forget the sunscreen if you need it! Today’s winds are traveling south-southwest at a speed of 4 MPH. At the end of the day don’t miss the sunset at 1:01 AM.