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The warmest places in North America in August: ranked by average high temperature

Mexicali tops the list at 42 °C in August. Ranked from 1991–2020 climate normals across 50 destinations in North America.

Top three in August: Mexicali (42 °C) , San Luis Río Colorado (41 °C) , Phoenix (40 °C) . Between first and 50th place the avg high differs by 9.1 °C.

# Destination Country Avg high Avg high Avg low Rainfall Wet days Sunshine Sea temp
1 Mexicali Mexico 42 °C 42 °C 28 °C 9 mm 2 395 h –
2 San Luis Río Colorado Mexico 41 °C 41 °C 28 °C 10 mm 2 395 h –
3 Phoenix United States 40 °C 40 °C 28 °C 28 mm 4 388 h –
4 Mesa United States 40 °C 40 °C 27 °C 25 mm 4 388 h –
5 Henderson United States 39 °C 39 °C 26 °C 10 mm 2 398 h –
6 Las Vegas United States 38 °C 38 °C 26 °C 9 mm 2 400 h –
7 Spring Valley United States 38 °C 38 °C 25 °C 11 mm 2 400 h –
8 Hermosillo Mexico 38 °C 38 °C 27 °C 53 mm 9 376 h –
9 Nuevo Laredo Mexico 37 °C 37 °C 26 °C 35 mm 5 380 h –
10 Piedras Negras Mexico 37 °C 37 °C 26 °C 47 mm 4 376 h –
11 Ciudad Obregón Mexico 37 °C 37 °C 26 °C 88 mm 13 364 h –
12 Fresno United States 36 °C 36 °C 21 °C 0 mm 0 407 h –
13 Tucson United States 36 °C 36 °C 24 °C 34 mm 7 381 h –
14 Ciudad Acuña Mexico 36 °C 36 °C 26 °C 40 mm 4 374 h –
15 Reynosa Mexico 36 °C 36 °C 26 °C 38 mm 6 380 h –
16 Bakersfield United States 36 °C 36 °C 22 °C 0 mm 0 405 h –
17 Austin United States 35 °C 35 °C 25 °C 58 mm 5 374 h –
18 San Antonio United States 35 °C 35 °C 25 °C 50 mm 6 374 h –
19 Lancaster United States 35 °C 35 °C 20 °C 1 mm 0 404 h –
20 Modesto United States 35 °C 35 °C 18 °C 1 mm 0 408 h –
21 Fort Worth United States 35 °C 35 °C 25 °C 55 mm 6 374 h –
22 Dallas United States 35 °C 35 °C 25 °C 59 mm 6 373 h –
23 La Paz Mexico 35 °C 35 °C 26 °C 52 mm 9 375 h 29 °C
24 Arlington United States 35 °C 35 °C 25 °C 54 mm 5 373 h –
25 Los Mochis Mexico 35 °C 35 °C 27 °C 94 mm 12 351 h 30 °C
26 Palmdale United States 34 °C 34 °C 20 °C 10 mm 2 403 h –
27 Ciudad Juárez Mexico 34 °C 34 °C 22 °C 25 mm 5 382 h –
28 San Bernardino United States 34 °C 34 °C 20 °C 8 mm 2 401 h –
29 Riverside United States 34 °C 34 °C 20 °C 1 mm 0 401 h –
30 Sacramento United States 34 °C 34 °C 16 °C 1 mm 0 407 h –
31 Mérida Mexico 34 °C 34 °C 24 °C 94 mm 17 354 h –
32 Shreveport United States 34 °C 34 °C 24 °C 72 mm 8 361 h –
33 Dessalines Haiti 34 °C 34 °C 25 °C 118 mm 19 346 h –
34 Plano United States 34 °C 34 °C 25 °C 57 mm 5 374 h –
35 Monclova Mexico 34 °C 34 °C 24 °C 44 mm 7 370 h –
36 Cypress United States 34 °C 34 °C 24 °C 88 mm 11 364 h –
37 Ciudad Apodaca Mexico 34 °C 34 °C 23 °C 32 mm 5 371 h –
38 Fontana United States 34 °C 34 °C 19 °C 1 mm 0 401 h –
39 Bayamo Cuba 34 °C 34 °C 24 °C 132 mm 22 349 h –
40 Guantánamo Cuba 34 °C 34 °C 25 °C 97 mm 17 355 h –
41 Oklahoma City United States 34 °C 34 °C 24 °C 65 mm 6 375 h –
42 Port-au-Prince Haiti 34 °C 34 °C 26 °C 175 mm 21 350 h 30 °C
43 Ciudad Victoria Mexico 34 °C 34 °C 22 °C 77 mm 11 373 h –
44 Ciudad Benito Juárez Mexico 33 °C 33 °C 23 °C 48 mm 6 374 h –
45 Corona United States 33 °C 33 °C 19 °C 1 mm 0 400 h –
46 Houston United States 33 °C 33 °C 25 °C 104 mm 14 359 h –
47 Campeche Mexico 33 °C 33 °C 25 °C 129 mm 19 353 h 30 °C
48 Torreón Mexico 33 °C 33 °C 22 °C 31 mm 5 369 h –
49 Moreno Valley United States 33 °C 33 °C 20 °C 8 mm 2 401 h –
50 Tulsa United States 33 °C 33 °C 23 °C 70 mm 7 370 h –

Monthly values for the month named in the ranking; only destinations with a published climate page are ranked. Download this ranking as CSV.

The same ranking one month earlier and later

July: top 5

  1. Mexicali 43 °C
  2. San Luis Río Colorado 42 °C
  3. Phoenix 41 °C
  4. Mesa 41 °C
  5. Henderson 40 °C

Full ranking for July

September: top 5

  1. Nuuk 6.8 °C
  2. Anchorage 12 °C
  3. Saint-Pierre 15 °C
  4. Edmonton 18 °C
  5. Victoria 18 °C

Full ranking for September

How this ranking is built

What is ranked
The average daily high temperature, in °C, in August, highest first.
Period
1991–2020 climate normals: the same 30 years for every destination, so the list compares like with like.
Who is included
50 destinations in North America with a published climate page. Neighbouring places that share a climate series are shown once.
Ties
Equal values are ordered by population.
Sources
ERA5 / ERA5-Land reanalysis via Open-Meteo; sea temperature from NOAA OISST v2.1. Measured values are reproduced unchanged; only the ordering is ours.

Data sources and method

Normal period
1991–2020
Dataset version
era5-1991-2020-scores1.1
Last processed

Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: ranking order, beach and comfort scores. Full formulas are on the methodology page.

Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.