Syracuse hits 91 degrees, breaks 64-year May 18 heat record

A 91-degree afternoon in Syracuse turned May 18 into the city’s first 90-degree day of 2026 and broke a May 18 record that had stood since 1962. For Onondaga County, the heat was more than a number on a thermometer: it raised the stakes for outdoor work, school sports, older adults, and anyone without reliable cooling as the region headed into another hot stretch.

The National Weather Service said Syracuse reached 91 degrees at 3:59 p.m., topping the previous May 18 record of 90 degrees set in 1962. The day’s low was 60 degrees, according to the climate report, and the Syracuse record period stretches back to 1902, underscoring how unusual the afternoon was even by long-term local standards.

The timing matters because forecasters said heat and humidity were expected to build again Tuesday, with a cold front then bringing cooler weather by Wednesday. That sets up a familiar early-summer pattern for Central New York: one hot day can quickly turn into several, and Onondaga County defines extreme heat as 90 degrees or higher, with a heat wave meaning three or more such days in a row.

Health officials have repeatedly warned that the effects go well beyond discomfort. The Onondaga County Health Department says summers in Central New York are getting hotter and that extreme heat can worsen cardiovascular, respiratory and diabetes conditions. People at higher risk include children, older adults, people with chronic conditions, people without access to cooling and people experiencing homelessness.

The county’s own numbers show how quickly hot weather has become a recurring public health issue. In 2025, Onondaga County had at least 17 extreme heat days, including two heat waves. In 2024, it had 20 extreme heat days, including a five-day heat wave in June. Syracuse also had a record-breaking nine days in 2024 when temperatures reached 89 degrees, according to county health officials.

That is why local officials have turned to practical protections during dangerous heat: cooling centers, libraries, community centers, pools and spray features. The City of Syracuse has used those measures before, and county officials have directed older adults to cooling-center resources when temperatures climb.

The broader warning is clear. Extreme heat is the leading cause of weather-related deaths in the United States and New York State, according to the New York State Heat Risk and Illness Dashboard. With Syracuse already at its first 90-degree day and more heat on the way, the next few days will test how well the city and county can help residents stay safe when summer arrives early.