Your Halloween holiday will have a "spooky" warmness in the air. Temperatures will flirt with 70 despite there not being a lot of sun and an abundance of "spooky" clouds and perhaps a harmless passing shower. They'll also be a swift, "spooky" breeze in the air as the trick-or-treaters head out in the evening. As perfect timing would have it, the really "spooky" weather doesn't hit until later Halloween night when periods of rain, some perhaps heavy, move in for several hours as a cold front heads in.
Things dry out Friday after any leftover morning precipitation, but temperatures will still hang near 70 as the push of cold air behind the cold front will be a bit delayed.
If things keep on moving, Saturday should be decent with temperatures cooler and in the 60s, but there's still some question on if a disturbance lends more clouds and showers that day, as well. We'll fine tune that forecast.