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 1:23 PM. The temperature feels like 53.6 with a humidity level of 94 so dress accordingly. Cloud coverage is 63 percent with visibility at 7 percent. Today’s UV index is 1, don’t forget the sunscreen if you need it! Today’s winds are traveling west-northwest at a speed of 7 MPH. At the end of the day don’t miss the sunset at 2:38 AM.