National Weather Service United States Department of Commerce

Summer-like heat is the main story for the remainder of the Memorial Day weekend. Upper ridge builds right over the area through Monday, keeping thunderstorm threat minimal at best, and temperatures hot especially by May standards.
It's beautiful beach weather for Lake Michigan beachgoers, but remember the water is still quite cold! As of Friday, the water temperature was still in the 50s for northeast Illinois and northwest Indiana nearshore locations. Use extra caution if considering swimming.
An Air Pollution Action Day has been extended by Illinois for Saturday May 26 to include Sunday May 27 and Monday May 28 for the Chicago metropolitan area. The air quality index is expected to be in the orange, or unhealthy for sensitive groups range. Active children and adults, especially people with pulmonary or respiratory disease such as asthma, should limit prolonged outdoor activity. More information can be found at www.cleantheair.org, www.epa.state.il.us/air/aqi/index.html and at www.airnow.gov.