I checked several weather forecasts (mountain-forecast.com excluded), and they all point to an above-normal heat wave on Saturday and Sunday. Temps on both side of the Sierra will be in the mid-upper 90s. So I am thinking the predictions are consistent. The snow will be melting fast!
I would go for the planned trip. Take extra socks, and maybe gators to help keep the feet warm and dry. It could turn out to be a beautiful hike. Even if you don't make the summit, being up there will be fun.
