The best time to visit Kelseyville is during the late spring and early fall, specifically from May to June and September to October, when the weather is most pleasant for outdoor activities.During these months, the temperatures are moderate, making it ideal for exploring the local vineyards, enjoying Clear Lake, and participating in outdoor events. You'll find fewer crowds compared to the peak summer months, allowing for a more relaxed experience at wineries and local eateries.For couples looking for a romantic getaway, these shoulder seasons offer a comfortable climate for vineyard tours and scenic drives around Clear Lake without the intense summer heat. Many local establishments, from dining to accommodations, are fully operational, providing a complete experience.Travelers interested in fishing and water sports might prefer the warmer summer months from July to August, though temperatures can be quite high.