Yes, you will likely run into winter driving conditions on the pass. Check the Washington State Dept of Transportation website for exact conditions.It s been snowing up there a lot in the past few weeks. If you make the drive, make sure your car is in good shape, with decent tires on them. Bring chains and know how to put them on. Plan to drive across mid-day to increase the chances for above freezing weather and better driving conditions. Have warm clothes, food and water with you in case the pass gets closed and you are stuck in your car for a while.
How it is right now is no indication of how it will be Thu. Check the Washington DOT website the day before/day you re going - http://wsdot.wa.gov/Traffic/passes/snoqu�� This will tell you what the current conditions are like and if there s any restrictions (chains required, closed due to avalanche, etc)