The best time to visit Walnut, California, is during the spring and autumn months for pleasant weather and fewer crowds.From March to May, temperatures are mild, typically ranging from 15°C to 25°C. This period offers comfortable conditions for outdoor activities and exploring the local area without the intense heat of summer. You'll find the landscape is lush and green, making it a lovely time for walks in regional parks.Similarly, September to November provides agreeable weather, with temperatures generally between 18°C and 28°C. The summer heat has subsided, and the air is often clearer.