An extreme heat warning has been issued for Cook County from Saturday through Monday. Afternoon temperatures are predicted to be in the 90s. Coupled with high humidity, heat indices could reach 100-105 degrees each day, according to the National Weather Service.

Heat remains the deadliest form of extreme weather in the U.S., contributing to more than 800 deaths annually on average since 1999, a 2023 study found.

Friday is the longest day of the year north of the equator, where the solstice marks the start of astronomical summer. It’s the opposite in the Southern Hemisphere, where it is the shortest day of the year and winter will start.

Thanks to a recent update to the arboretum’s website, gardeners will find it easier to broker a love connection between plants and pollinators.

The dazzling panoramic shot released Wednesday of the Sculptor galaxy by a telescope in Chile is so detailed that it’s already serving as a star-packed map.

The heat will be particularly worrisome this weekend across wide stretches of Nebraska, Illinois, Wisconsin and Iowa, where forecasters are warning of extreme temperature impacts.

Father's Day took on extra meaning this year for Lake County's piping plover papa Pepper — he's a dad again, at least three times over.

The Chicago Park District has announced that for the first time since 2020, all of the district's 50 outdoor pools will be open seven days a week, beginning Saturday, just as temperatures are expected to soar into the 90s.

According to the Great Lakes Piping Plover Recovery Effort, 2025 has been a year for the record books, with 82 breeding pairs counted.

Just days after Brookfield Zoo issued the exciting announcement of the first bottlenose dolphin born at the zoo in more than a decade, staff is mourning the sudden death of the calf on Wednesday night.

A space rock the color of coal and no larger than a pebble you’d shake from a shoe just arrived at the Field Museum, where scientists will spend the next two months probing this extraordinary specimen for clues to the origin of life on Earth.

The EPA also proposed weakening a regulation that requires power plants to reduce emissions of mercury and other toxic pollutants that can harm brain development of young children and contribute to heart attacks and other health problems in adults.

If private landowners don’t remove invasives alongside natural areas, species like buckthorn will persist in forest preserves and parks, regardless of habitat restoration efforts.

Dino Derby, a foot race featuring competitors wearing inflatable T. Rex costumes, will be the main event during Saturday's Dinopalooza festival at the Field Museum.

Illinois environmental officials are warning residents about air quality concerns as wildfire smoke from Canada persists in Chicago through Friday.

Graceland Cemetery's newest residents — a litter of coyote pups — are causing a stir.