The website Mountain Forecast has given indications of what the weather will be like high up on K2. They give a weather indication on K2 on the summit at 8612m.
There is improved weather on the summit attempt in the next few days but it is not perfect. There are lower winds that are expected on all days compared to the last summit push. Yet on all of the days there should be snow. Interestingly, on the proposed summit day on the 5th of August there is predicted to be 7cm of snow during the day. The winds should be between 5-15kh/h throughout the day though. This would be ideal for a summit attempt in terms of that.