Could be anything unfortuantly.
At the moment we have had everything from really warm sunny days to snow within a week. Of course we wont be having snow by the con time but its never that simple XD
Generally speaker cool cloudy weather is the norm for around then, last year we did have some rain but we have also had really hot weather for some confuzzled's. Best thing you can do it check online weather reports for the area before you leave.