The hottest temperatures of the year so far, combined with high humidity, could push the heat index in Central New York to nearly 100F (38C) on Wednesday.
The heat index is the measure of how hot it feels given the temperature and humidity.
High humidity makes it harder for the body to evaporate sweat and cool off.
The combination of heat and high humidity can be dangerous for people who are outdoors.
Tuesday will be hot, with a high of 90, but the humidity will likely stay below 40 percent.
Wednesday and Thursday, however, will be hotter with higher humidity, and the heat index could reach into the high 90s both days.
Wednesday could even break a record for the date, which is 94, set in 1995.
Three days in a row of 90 or above constitutes an official heat wave in Central New York.
The last time that happened was last year, from Sept. 6 to 9.
This week, nights will be warm, too, with temperatures staying in the 70s Wednesday and Thursday nights.
High temperatures fall back into the mid-80s on Friday.
3 dead due to heat wave in the Abruzzo region Italy
Hurricane Celia set to strengthen into a "major hurricane" in the East Pacific
A new record: Ten thousand lightning flashes lit up Hong Kong's night sky over the weekend
22 dead and 170,000 forced from their homes from Flash floods in India
11 dead 200 villages marooned as devastating flash floods hit Madhya Pradesh India
500,000 evacuated as deadly Typhoon Nepartak makes landfall in China
Super Typhoon Nepartak hit's Taiwan: 331,900 households without power, strongest winds since 1901