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