If you planning to travel to Lake Sammamish State Park, Issaquah, Washington, here is your 6-day travel weather forecast to make sure you have all the essentials needed during your stay. Start your day when the sunrises at 3:35 PM. The temperature feels like 41.75 with a humidity level of 94 so dress accordingly. Cloud coverage is 82 percent with visibility at 9.1 percent. Today’s UV index is 1, don’t forget the sunscreen if you need it! Today’s winds are traveling south-southwest at a speed of 14 MPH. At the end of the day don’t miss the sunset at 12:18 AM.