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 2:23 PM. The temperature feels like 52.8 with a humidity level of 81 so dress accordingly. Cloud coverage is 45 percent with visibility at 13.5 percent. Today’s UV index is 0, don’t forget the sunscreen if you need it! Today’s winds are traveling northwest at a speed of 13 MPH. At the end of the day don’t miss the sunset at 1:07 AM.