Weather for McHenry, Illinois
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Five Day Weather Forecast
Air Quality
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3
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Best Times for Fishing or Hunting
Major Periods
Minor Periods
Action Rating: out of 5
Beach Hazards Statement issued May 29 at 2:58PM CDT until May 30 at 9:00PM CDT by NWS Chicago IL
Effective: Fri May 29, 2026, 2:58 PM
Expires: Fri May 29, 2026, 11:00 PM
* WHAT...High waves of 3 to 6 feet and dangerous currents expected at Lake Michigan beaches. * WHERE...Lake IL, Northern Cook and Central Cook County beaches. * WHEN...From Saturday morning through Saturday evening. * IMPACTS...Swimming conditions will be life threatening, especially for inexperienced swimmers. For information on swim advisories or bans at Chicago beaches: www. cpdbeaches. com.
Remain out of the water to avoid dangerous swimming conditions and do not venture out onto piers, jetties, breakwalls, or other shoreline structures.
Beach Hazards Statement issued May 29 at 9:16PM CDT until May 30 at 9:00PM CDT by NWS Chicago IL
Effective: Fri May 29, 2026, 9:16 PM
Expires: Sat May 30, 2026, 5:30 AM
* WHAT...High waves of 3 to 6 feet and dangerous currents expected at Lake Michigan beaches. * WHERE...Lake IL, Northern Cook and Central Cook Counties. * WHEN...From 7 AM CDT Saturday through Saturday evening. * IMPACTS...Swimming conditions will be life threatening, especially for inexperienced swimmers. For information on swim advisories or bans at Chicago beaches: www. cpdbeaches. com.
Remain out of the water to avoid dangerous swimming conditions and do not venture out onto piers, jetties, breakwalls, or other shoreline structures.
Beach Hazards Statement issued May 29 at 5:43PM CDT until May 30 at 9:00PM CDT by NWS Milwaukee/Sullivan WI
Effective: Fri May 29, 2026, 5:43 PM
Expires: Sat May 30, 2026, 1:45 AM
* WHAT...Life threatening waves of 3 to 5 feet and dangerous currents are expected. * WHERE...Ozaukee, Milwaukee, Racine and Kenosha Counties. * WHEN...From Saturday morning through Saturday evening. * IMPACTS...Dangerous swimming conditions are expected due to high waves and onshore winds.
Stay out of the water and away from dangerous areas like piers and breakwalls. Strong structural and longshore currents are expected. Rip currents are possible.
Beach Hazards Statement issued May 29 at 11:05PM CDT until May 30 at 9:00PM CDT by NWS Milwaukee/Sullivan WI
Effective: Fri May 29, 2026, 11:05 PM
Expires: Sat May 30, 2026, 7:15 AM
* WHAT...Life threatening waves of 3 to 5 feet and dangerous currents are expected. * WHERE...Ozaukee, Milwaukee, Racine and Kenosha Counties. * WHEN...From Saturday morning through Saturday evening. * IMPACTS...Dangerous swimming conditions are expected due to high waves and onshore winds.
Stay out of the water and away from dangerous areas like piers and breakwalls. Strong structural and longshore currents are expected. Rip currents are possible.