The climate in the San Juan's is mile, with warm days throughout the summer. The temperature of the surrounding waters averages a cool 50 degrees fahrenhiet ( 10 Celsius ) and experts a moderating influence on the climate all year long.
The San Juan Islands lie in a " Rain Shadow"
between the mountains of Vancouver Island to the west and the
Cascades to the east, so they receive much less precipitation than
most parts of the Pacific Northwest. Rain is infrequent during the
months of July and August, and most days are sunny, dry and warm.
September is often the most rewarding time to visit the islands. The
days are cooler, but the weather usually remains bright and dry, and
the peak vacation season is over. During the late fall, winter and
early spring, the days are short and cool with frequent
rainfall.
