Temperatures are expected to reach the upper 90s on Monday, and exceed 100 degrees on Tuesday and Wednesday. New Yorkers who do not have the luxury of air conditioning can head to 100 cooling centers in the city to get relief today. Another 500 centers will open tomorrow.

New York City Mayor Michael Bloomberg says the elderly are especially vulnerable to the high heat. “The threat of heat exhaustion is real, and that’s why we’ve opened these cooling centers, or will open them, at senior centers and Salvation Army community centers,” the mayor said.

Officials say they're also bringing portable water stations to public spaces around the city this summer. The Water-On-The-Go program will connect water stations to fire hydrants so that New Yorkers can get drinks, or fill water bottles or pet bowls. The 10 stations will rotate locations around the city through Labor Day weekend.

According to the Department of Health and Mental Hygiene, 46 New Yorkers died in two heat waves in 2006.

To locate the closest cooling center, call the city's toll-free information line, 311.