Chicago woke up Tuesday, May 12, 2026, under mostly cloudy skies and mid-40s temperatures, but the chill will not last. The city is headed for a fast jump into near 77°F this afternoon, and the weather will get feisty as it warms. South-southwest winds are expected to crank up, with scattered showers moving in later in the day. A brief stretch of scattered showers and thunderstorms through the early evening could slow the commute and turn lakefront plans into a windblown adventure.
Afternoon Winds Pick Up
Those south-southwest winds will steadily strengthen through the day, frequently gusting near 40 mph and briefly topping 45 mph in a few areas, as temperatures climb into the upper 70s. Scattered rain showers are expected to develop by mid-afternoon, around 3 to 4 p.m.
Early this evening, roughly 6 to 9 p.m., a frontal boundary could spark another round of isolated to widely scattered showers and thunderstorms. Any storm in that window may bring gusty winds or marginal hail. The overall risk for severe weather remains low, but forecasters still advise a bit of extra caution while that line moves through. This outlook comes from National Weather Service Chicago.
What It Means For Your Plans
If you are heading outside this afternoon or evening, it is a good day for a Plan B. Gusts near the lakefront could flip umbrellas, send lawn chairs skittering, and make patio dining a little more dramatic than advertised. Commuters should budget extra time for the evening rush, and flyers may see brief delays if a thunderstorm clips the airports.
We first flagged Tuesday rain in our May 8 forecast, but the latest update tightens the timing and underscores that the real headline today is the stronger wind.
Lakefront Boaters Should Watch Advisories
Conditions will be especially rough on the water. A Small Craft Advisory is in effect for nearshore Lake Michigan waters from 9 a.m. Tuesday into Wednesday evening for Illinois nearshore areas, with gusty winds and choppy waves expected. Less experienced boaters and smaller vessels are advised to stay in port until conditions calm down. Advisory details are listed by National Weather Service Chicago.
Temperatures cool again and the breeze hangs on Wednesday, but a longer warm-up is slated to build later in the week. In the meantime, secure loose items, hold onto your hat, and keep an eye on radar this afternoon if you will be out and about.
