News Release: 7/30/2026 How Hot Is Too Hot for Cats?

Well, hello there!

Cats may enjoy sunny windows and warm rooms, but extreme heat can cause dehydration, heat exhaustion, or life-threatening heatstroke. Most cats are comfortable between 60° and 80°F, with 65°–75°F considered ideal indoors. Once temperatures rise above 80° F, cats—especially those accustomed to air conditioning—should be watched carefully. Temperatures above 100°F are dangerous, and cats should remain indoors.

Humidity matters as much as temperature. Cats cool themselves partly by panting, which allows moisture to evaporate from their lungs. High humidity makes evaporation less effective, so an 85° F humid day may be as dangerous as a 100°F dry day.

Heat exhaustion may begin when a cat's body temperature reaches 103°–104°F. Warning signs include lethargy, restlessness, excessive grooming, panting, rapid breathing, drooling, reduced appetite, and seeking cool surfaces. Heatstroke occurs around 105°F or higher and is a medical emergency. Signs can include red or purple gums, vomiting, diarrhea, confusion, wobbliness, tremors, weakness, seizures, unusual bleeding, or collapse. Without rapid treatment, heatstroke may cause organ failure, brain damage, and death.

Dehydration can occur alone or with overheating. Watch for dry or tacky gums, sunken eyes, poor appetite, lethargy, panting, a rapid heart rate, or skin that does not quickly spring back after being gently lifted.

If your cat shows signs of overheating, immediately move them into a cool, ventilated area and offer cool—not ice-cold—water. Contact your veterinarian promptly. Panting, wobbliness, confusion, seizures, or collapse require immediate emergency veterinary care. Do not delay treatment while trying to cool a severely affected cat at home.

To prevent heat problems, use air conditioning or fans and aim to keep indoor temperatures near 65°–75°F. Provide fresh, cool water at all times, close blinds during peak sunlight, and offer a cooling bed or mat. Never leave a cat in a hot car, garage, sunroom, shed, or poorly ventilated space. Kittens, seniors, overweight cats, flat-faced breeds, and cats with heart, kidney, or breathing problems need extra protection and closer monitoring during hot weather throughout the hottest summer months.