textproduct: Chicago

KEY MESSAGES

- A stagnant, predominantly precipitation free pattern will prevail through at least mid next week, with seasonably warm daytimes inland, and cooler temperatures closer to the lake.

- Hazardous swimming conditions are anticipated at Lake Michigan beaches on Saturday, particularly in Illinois.

DISCUSSION

Issued at 248 AM CDT Fri May 29 2026

Beneath the leeward side of an upper level omega block, high pressure will dominate the Great Lakes region today leading to a pleasant and warm end to the work week. As the surface high, centered over lower Michigan early this morning, continues to pull away from the local area, winds will turn southerly after daybreak helping temperatures to climb into the middle 80s this afternoon away from the lake. A lake breeze is expected to protrude inland beginning late this morning keeping communities along the lakeshore likely stuck in the upper 60s to lower 70s today with the coolest conditions anticipated on the IL side of the lake. Some marginally breezy winds may be found behind the lake breeze as it progresses inland, otherwise expect generally light winds today with sunshine filtered by some high level cloud cover.

This upper blocking pattern looks to hold for several days which will keep relative high pressure parked over the Great Lakes well into next week. This will result in a very quiet and dry stretch of weather through the next week. A second center of high pressure will drop into the region from the north early tomorrow bringing slightly cooler, some may say more comfortable, conditions to the weekend. Highs are progged in the 70s and lower 80s both Saturday and Sunday with notably cooler conditions forecast toward the lakeshore both days, again with the coolest conditions expected on the IL side of the lake. So while it will feel like great beach-going weather inland this weekend, expect noticeably cooler conditions on Lake Michigan beaches.

Another word of caution for weekend beachgoers: Breezy onshore winds will lead to a High Swim Risk with dangerous waves and currents on Saturday at Illinois Lake Michigan beaches and generally unfavorable swimming conditions at Indiana beaches. Due to the anticipated High Swim Risk, a Beach Hazards Statement will be issued for Saturday and Saturday night for Illinois Lake Michigan beaches. Less than favorable swimming conditions may linger into early Sunday as well, particularly in Illinois.

Regular chances for rain are forecast into next week west of the Mississippi along a stagnant baroclinic zone stirring on the western fringe of the surface high. Sunday night into Monday, some medium-range guidance suggests some of this baroclinicity could meander east and bring scattered rain chances to parts of western and central IL, but dry conditions are favored around our CWA. Couldn't argue with the NBM's slight chance PoPs in our southwest CWA Sunday night. Those will be our only mentionable PoPs in the forecast for the next week as the blocking pattern is progged to break and reinforce high pressure around the region during the middle part of next week. Support for precip builds toward the end of next week as the high finally looks to eject out over the Atlantic.

Doom

AVIATION /18Z TAFS THROUGH 00Z SUNDAY/

Issued at 1230 PM CDT Fri May 29 2026

VFR conditions expected through the 18z TAF cycle.

Lake breeze will result in a wind shift to easterly around 10kt this afternoon at the immediate Chicago terminals. Light, mostly easterly winds are expected tonight. A secondary cold front will move across the regional Saturday morning. The only impact will be a slight increase in east northeast winds behind the front, most notable for the terminals closer to Lake Michigan.

- Izzi

LOT WATCHES/WARNINGS/ADVISORIES

IL...Beach Hazards Statement from Saturday morning through Sunday morning for ILZ006-ILZ103-ILZ104.

IN...None. LM...None.