Hot Weather in USA

Hottest US Cities in Summer

Two of the 51 largest cities in the United States, Phoenix and Las Vegas, stand out as consistently getting remarkably hot weather during the months of June, July and August. They are the only major cities with an average temperature throughout summer of 90 °F (32 °C) or more. Another eleven US cities also have average summer temperatures above 80 °F (26.7 °C).

These rankings of hottest cities use long-term temperature averages, based on weather data collected from 1981 to 2010 for the NOAA's National Climatic Data Center.

The major cities included in the weather rankings represent the 51 metropolitan areas in the United States with the biggest populations, all those with over one million people in 2010, according to the US Census Bureau. A complete list of America's 51 largest urban centers is available here.

US cities with the highest normal daily mean temperatures in June, July and August
City Daily Summer Mean
  °F °C
Phoenix, Arizona 93 34
Las Vegas, Nevada 90 32
Dallas, Texas 85 30
Austin, Texas 84 29
San Antonio, Texas 84 29
Houston, Texas 84 29
Miami, Florida 84 29
Tampa, Florida 83 28
New Orleans, Louisiana 83 28
Orlando, Florida 82 28
Memphis, Tennessee 81 27
Jacksonville, Florida 81 27
Oklahoma City, Oklahoma 81 27

Hottest Days

During summer months, 13 of the largest US cities routinely get over 90 F (32.2 C), including two cities where temperatures top 100 F (37.8 C) on a typical summer day.

US cities with the highest normal daily maximum temperatures in June, July and August
City Average Summer High Days Over
  °F °C 99 °F
Phoenix, Arizona 105 40 80
Las Vegas, Nevada 102 39 60
Austin, Texas   95 35 15
Dallas, Texas   95 35 16
San Antonio, Texas   94 35   8
Riverside, California   93 34 17
Houston, Texas   93 34   3
Oklahoma City, Oklahoma   92 33 10
Orlando, Florida   91 33   0
Jacksonville, Florida   91 33   1
New Orleans, Louisiana   91 33   0
Memphis, Tennessee   91 33   2
Miami, Florida   91 33   0

Warmest at Night

Some American cities don't cool down much at night. For 13 of the country's 51 metro regions, temperatures normally stay above 70 F (21 C) throughout summer.

US cities with the highest normal daily minimum temperatures during June, July and August
City Average Summer Low
  °F °C
Phoenix, Arizona 81 27
Las Vegas, Nevada 78 26
Miami, Florida 77 25
Tampa, Florida 76 24
Dallas, Texas 76 24
New Orleans, Louisiana 75 24
Houston, Texas 74 24
San Antonio, Texas 74 23
Austin, Texas 74 23
Orlando, Florida 73 23
Memphis, Tennessee 72 22
Jacksonville, Florida 72 22
Oklahoma City, Oklahoma 71 21
Reference

National Climatic Data Center. NOAA's 1981-2010 Climate Normals.

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AMERICAN WEATHER