What is the best time to visit Lake Nacimiento near Paso Robles?

Lake Nacimiento near Paso Robles is definitely a summer destination, and the hot period between July and September is perfect for swimming, boating, and standup paddleboarding. This is, naturally, the most popular time to visit the lake, when area campground reservations are likely to fill up quickly. To camp without the crowds, consider coming in October, when the weather is generally still warm enough for camping (if a tad cold for swimming).