The best time to go to Preston, Washington, is during the summer months, from June to September, when the weather is at its most pleasant.This period offers warm temperatures and minimal rainfall, making it ideal for outdoor activities like hiking, cycling, and exploring the natural beauty of the Snoqualmie Valley. The longer daylight hours also allow for more extensive sightseeing and recreational pursuits.For travelers who enjoy outdoor adventures, late spring (May) and early autumn (October) can also be good options. During these times, the weather is still generally mild, and the landscapes are particularly picturesque with spring blossoms or fall foliage, though you should be prepared for a higher chance of rain.