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 12:16 PM. The temperature feels like 68.9 with a humidity level of 59 so dress accordingly. Cloud coverage is 8 percent with visibility at 14.7 percent. Today’s UV index is 9, don’t forget the sunscreen if you need it! Today’s winds are traveling south-southwest at a speed of 3 MPH. At the end of the day don’t miss the sunset at 3:54 AM.