textproduct: Chicago

KEY MESSAGES

- Dangerous swimming conditions are anticipated at Lake Michigan beaches today, particularly in Illinois. A Beach Hazards Statement is in effect today for a High Swim Risk along the Illinois lakeshore.

- 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.

DISCUSSION

Issued at 223 AM CDT Sat May 30 2026

Our quiet stretch of weather continues here as we enter the weekend. Pressure trends will be on the rise around the Great Lakes today with a surface high expanding into the region from the north leading to another rain-free late spring day. A fair amount of sunshine will be filtered by some passing cirrus. Breezy east winds today are expected to transport cooler air well inland of the lake with upper 60s forecast along the lakeshore and 70s around the city and across the west and northwest suburbs while lower 80s are anticipated farther west and south.

The breezy onshore winds will also lead to dangerous swimming conditions at Illinois Lake Michigan beaches today. Swimming will be become dangerous even for experienced swimmers with hazardous waves and currents building quickly through the morning as winds pick up. A Beach Hazards Statement is in effect today for a High Swim Risk along the IL lakeshore. Hazardous swimming conditions may also be present at Lake County, IN beaches today where we're currently highlighting a Moderate Swim Risk.

Similar conditions are anticipated tomorrow. Afternoon highs are forecast in the middle 70s to lower 80s inland and cooler near the lake. A persistent upper wave stirring over the High Plains west of the blocking upper high will drape a quasi- stationary baroclinic zone west of the Mississippi River over the weekend driving frequent chances for rain out that way. In the early stages of this blocking pattern breaking, guidance is in agreement on that baroclinic zone meandering east of the river and possibly dropping some pockets of rain on parts of western and central IL Sunday night into Monday, which could include far western and southwestern portions of our CWA. There will be some dry low level air to combat with meager forcing, but just enough elevated instability may be present to stir up a couple of true showers. Otherwise, if anything, looking like pockets of lighter rain with QPF output largely ranging between trace amounts and a few hundredths of an inch around our west and southwest, though a few pockets of more meaningful amounts may be possible. At this point, not forecasting any rain chances into the Chicago metro.

The blocking pattern will break early next week and meander about the region through the middle of the week resulting in continued quiet weather. Highs are forecast generally in the lower 80s for the first half of the work week with cooler conditions near the lake and no rain chances beyond the slight chances into Monday. The prominent surface high will push off the Mid-Atlantic coast late next week and the return flow should bring warming temperatures to the area. There's quite a lot of spread in temperature guidance out at this range with more 80s favored, but some potential for upper 80s/near 90 late in the week.

Doom

AVIATION /12Z TAFS THROUGH 18Z SUNDAY/

Issued at 558 AM CDT Sat May 30 2026

East to northeasterly breezes will develop this morning. Some intermittent gustiness towards 20+ kts will be possible at times, particularly later this afternoon. Winds will then ease a bit and turn southeasterly this evening where they will remain through the end of the TAF periods. VFR conditions with SCT-BKN cirrus will prevail.

Carlaw

LOT WATCHES/WARNINGS/ADVISORIES

IL...Beach Hazards Statement through this evening for ILZ006-ILZ103- ILZ104.

IN...None. LM...Small Craft Advisory until 9 PM CDT this evening for the IL nearshore waters.