The southeast Wisconsin, Waukesha and Milwaukee forecast for the rest of your Saturday night, will be quiet, aside from a few flurries or sprinkles. Nothing major. Overnight lows will be around 30.
More rain or even a T'storm will develop on Sunday, especially in the morninig. This may mix in with a few snowflakes or sleet early, but then the afternoon should clear out for many of us. Highs Sunday will be in the mid-40's for our lakefront communities and Milwaukee temperatures and mid-50's for Waukesha's temperatures and inland areas. If you live farther south, the warm front could kick your temperatures up even higher than that.
The main energy from this next low pressure system will be rolling through Sunday night. That's going to bring in another round of rain. If you get caught under a storm, you could see over another half inch of rain that we don't need. The better chances of all of this is later at night. You may notice the temperature spike as well, but will fall after the front rolls through overnight.
There's going to be a stalled frontal boundary just to our south. This will be close enough to give us a chance of scattered showers on Monday. Highs will top out in the mid-50's.
Yes, the chance of rain continues on Tuesday as well with highs only in the mid-40's.
The best chance of more significant rain comes again on Wednesday through Thursday with highs still only in the 40's.