The waether should not be worse than now, the snow falling limit will be around 2000 m this weekend, raining and snowing most of the day.
So I would be prepared to temps of 0° during the night in the valleys, if you camp on the pass it could be colder. But you might be lucky with sunshine during the whole time, so don`t forget sunprotection as well.
Some gloves for the descents would be fine, as well as a cap.
Enjoy the alps
greetings from Bavaria