The southeast Wisconsin, Waukesha and Milwaukee forecast for the rest of your Saturday night will be breezy and very mild. You might see a stray sprinkle or shower out there, but most of the night will be just fine. Overnight lows may actually start rising late from a low in the low-50's.
Sunday, things will be going downhill as the day rolls on. There's a slight chance of a shower in the morning, but the steadier rains are going to be rolling in from west to east mainly in the afternoon. Things will still be mild with highs in the low-60's under breezy conditions.
Expect occasional rain to hang around on Sunday night as well. This will gradually taper off late as a strong cold front rolls through. Overnight, a few snowflakes may mix in with this, but we're not expecting accumulation out of this. Overnight lows will drop in to the upper-20's to around 30.
You will notice a huge difference in temperatures on Monday. Highs will struggle to make it into the mid-30's. To add insult to injury, it's going to be blustery out as will. Don't be surprised if you see a stray flurry in the afternoon.
Tuesday will be sunnier with highs only around 40.
Besides Sunday's rain event, most of the upcoming workweek looks cool, but quiet.