Most Miserable Weather Record Ever? Miami Just Tied Its Warmest Night of All-Time

Brian Donegan
Published: July 16, 2019

Miami has tied what is arguably the most miserable weather record that a city could set – the low temperature in the South Florida city didn't dip below the mid-80s Sunday morning.

Officially, at Miami International Airport, Sunday's low has gone down in the record books as 84 degrees, tying the city's all-time warmest low temperature for any month of the year, according to the National Weather Service.

An 84-degree low was also recorded in September 1897, August 1993, August 2017 (twice) and September 2017, so Sunday was the sixth occurrence of this all-time record-warm low in Miami and the first time the low was that warm in July. The previous record-warm low for July was 83 degrees on multiple occasions.

Actual morning lows on Sunday, July 14, 2019.

In order for temperatures to be this miserably warm overnight while you're sleeping, dew points – a measure of how much moisture is in the air – must be very high. Temperatures have a difficult time falling when the air is moist, and the temperature cannot drop below the dew point – so the higher the dew point, the higher the temperature.

Early Sunday morning, the dew point ranged from 74 to 76 degrees at the Miami airport between midnight and 7 a.m. EDT. Any dew point above 70 degrees makes it feel oppressively humid, so dew points in the mid-70s are extremely uncomfortable. In fact, the heat index was in the lower 90s in Miami all night.

(MORE: What Is the Heat Index and Why Is It Used?

Early-morning heat indices on Sunday, July 14, 2019.

If you don't live in the Sunshine State, you might think Floridians are used to this kind of heat and humidity, but Sunday was not the norm. A typical July night has lows in the mid- to upper 70s, if not cooler.

"I'm a few hours north of Miami. It only got down to 82 here (Sunday) night," said Jan Childs, a writer at weather.com. "I think (Sunday) was the worst humidity I've ever felt."

The average high temperature in New York City in mid-July is 84 degrees, the same as Miami's low on Sunday.


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