The best time to visit Ariel, Washington, is during the summer months, from June to September, when the weather is warm and conducive to outdoor activities.During this period, temperatures are pleasant, typically ranging from the mid-60s to high 70s Fahrenheit, with minimal rainfall. This makes it ideal for exploring the natural beauty of the area, including hiking trails, fishing in the local rivers and lakes, and enjoying the scenic views of Mount St. Helens.Families will find these months particularly appealing for a vacation. The comfortable weather allows for full days of outdoor adventures, such as visiting the Mount St. Helens National Volcanic Monument, picnicking by Lake Merwin, or exploring the Gifford Pinchot National Forest.