Hottest US cities in summer
The hottest major US city in summer is Phoenix, AZ, with an average July daytime high of 106°F, ahead of Las Vegas, NV (105°F) and Dallas, TX (97°F). The full ranking of the top 12 cities by average July high, with July overnight lows for context, is below. Figures are NOAA 1991–2020 Climate Normals.
Source: NOAA NCEI U.S. Climate Normals 1991–2020. Data as of June 2026.
Top 12 hottest summer cities
| # | City | Avg July high | Avg July low |
|---|---|---|---|
| 1 | Phoenix, AZ | 106°F | 84°F |
| 2 | Las Vegas, NV | 105°F | 82°F |
| 3 | Dallas, TX | 97°F | 78°F |
| 4 | Austin, TX | 97°F | 75°F |
| 5 | San Antonio, TX | 95°F | 75°F |
| 6 | Houston, TX | 94°F | 76°F |
| 7 | Salt Lake City, UT | 94°F | 68°F |
| 8 | Sacramento, CA | 93°F | 59°F |
| 9 | Oklahoma City, OK | 93°F | 70°F |
| 10 | Orlando, FL | 92°F | 73°F |
| 11 | Memphis, TN | 92°F | 74°F |
| 12 | Miami, FL | 91°F | 78°F |
Source: NOAA NCEI U.S. Climate Normals 1991–2020. Data as of June 2026.
Dry heat vs humid heat
The top of this list is dominated by the desert Southwest, where afternoons routinely top 100°F but the air is dry. Gulf Coast and Southeastern cities run a few degrees cooler on paper yet feel hotter because of high humidity. Either way, July is the peak — if heat is a concern, the spring and autumn "shoulder" months on each city page are far more comfortable. For the cool end of the year, see the warmest cities in January.
Frequently asked questions
What is the hottest US city in summer?
Among the major cities we track, Phoenix, AZ is the hottest in summer, with an average July daytime high of 106°F, ahead of Las Vegas, NV (105°F) and Dallas, TX (97°F), per NOAA 1991–2020 Climate Normals.
Which US cities have triple-digit summer temperatures?
Desert cities such as Phoenix, Las Vegas average daytime highs at or above 100°F in July. Dry heat feels different from the humid heat of Gulf Coast cities, but both call for hydration and shade.
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Last updated: 2026-06-18