The Milwaukee area may experience temperatures near 80 degrees and dew points in the 60s. This back and forth autumn and summer weather pattern is typical of September in Wisconsin. The atmosphere is in transition during the autumn months. As we continue to experience fewer daytime hours and a lower sun angle, temperatures, especially to our north, will be getting quite chilly. In fact, over the past few days high temperatures across northern Canada have been in the 20s and 30s.
Air flowing north from the Gulf of Mexico brings plenty of moisture which increases the dew points.
This type of airflow will influence our weather over the next few days bringing not only warmth, but the possibility of scattered thunderstorms. As the colder air in Canada continues to intensify, we will see fewer summerlike days across the area. In fact by Sunday, cooler air will already be pushing across the state. Later in the autumn, the transition will be toward winter weather as Canada becomes snow covered and very cold airmasses start to develop. In November, most folks in Wisconsin consider daytime highs in the 60s to be quite mild as normal temperature drop into the upper 30s and low 40s.