The Brief Thursday will be warm and mostly sunny with highs in the mid to upper 80s and comfortable humidity. Drier, cooler weather returns Sunday before temperatures warm again early next week. It will be warmer with highs in the mid to upper 80s, but humidity levels remain in check. Chicago rain on tapWhat's next:Rain is on the way Friday with the bulk of it starting in the early afternoon. On Monday we’ll make it into the low 80s with mid 80s likely on Tuesday.