Why is the temperature usually warmer in Issaquah-does it have something to do with I-90?
Summer temperatures are often warmer during daylight hours in communities (such as Issaquah) that are farther inland from Puget Sound. The water...or distance from water...is the key. On hot days, wading through water is a way to cool off. That's because water is slower to warm up than air...and certainly compared to pavement or soil. You don't want to walk barefoot on a hot day on pavement! It's this difference in absorbing and releasing heat that causes temperatures to be typically cooler during summer days along shorelines, compared to inland locations such as Issaquah. You'll see that reflected in our forecasts and also by reports from our schoolnet stations. However, that same tendency for water to be slow to change temperature keeps daytime highs warmer during the winter months along shorelines...and cooler at inland locations such as Issaquah.