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

Mexicali tops the list at 39 °C in September. Ranked from 1991–2020 climate normals across 50 destinations in North America.

Top three in September: Mexicali (39 °C) , San Luis Río Colorado (38 °C) , Phoenix (38 °C) . Between first and 50th place the avg high differs by 7.8 °C.

# Destination Country Avg high Avg high Avg low Rainfall Wet days Sunshine Sea temp
1 Mexicali Mexico 39 °C 39 °C 24 °C 9 mm 1 353 h –
2 San Luis Río Colorado Mexico 38 °C 38 °C 25 °C 12 mm 2 353 h –
3 Phoenix United States 38 °C 38 °C 24 °C 25 mm 3 350 h –
4 Mesa United States 37 °C 37 °C 23 °C 27 mm 3 351 h –
5 Hermosillo Mexico 36 °C 36 °C 25 °C 54 mm 7 338 h –
6 Ciudad Obregón Mexico 36 °C 36 °C 25 °C 85 mm 9 334 h –
7 Henderson United States 35 °C 35 °C 22 °C 7 mm 1 356 h –
8 Tucson United States 35 °C 35 °C 21 °C 29 mm 4 348 h –
9 Las Vegas United States 34 °C 34 °C 21 °C 7 mm 1 357 h –
10 Spring Valley United States 34 °C 34 °C 20 °C 8 mm 1 357 h –
11 Los Mochis Mexico 33 °C 33 °C 26 °C 106 mm 11 327 h 30 °C
12 Nuevo Laredo Mexico 33 °C 33 °C 24 °C 80 mm 9 315 h –
13 Fresno United States 33 °C 33 °C 18 °C 2 mm 0 355 h –
14 La Paz Mexico 33 °C 33 °C 25 °C 92 mm 9 335 h 29 °C
15 Piedras Negras Mexico 33 °C 33 °C 23 °C 79 mm 8 317 h –
16 Bakersfield United States 33 °C 33 °C 18 °C 1 mm 0 355 h –
17 Mérida Mexico 33 °C 33 °C 24 °C 132 mm 19 328 h –
18 Dessalines Haiti 33 °C 33 °C 24 °C 148 mm 22 324 h –
19 Reynosa Mexico 33 °C 33 °C 24 °C 90 mm 12 315 h –
20 Ciudad Acuña Mexico 33 °C 33 °C 23 °C 63 mm 7 319 h –
21 Bayamo Cuba 33 °C 33 °C 23 °C 164 mm 23 326 h –
22 Riverside United States 32 °C 32 °C 18 °C 5 mm 1 352 h –
23 Port-au-Prince Haiti 32 °C 32 °C 25 °C 199 mm 23 323 h 30 °C
24 San Bernardino United States 32 °C 32 °C 18 °C 7 mm 2 353 h –
25 Santiago de los Caballeros Dominican Republic 32 °C 32 °C 23 °C 81 mm 14 323 h –
26 Guantánamo Cuba 32 °C 32 °C 24 °C 138 mm 21 331 h –
27 Modesto United States 32 °C 32 °C 16 °C 2 mm 1 356 h –
28 Fontana United States 32 °C 32 °C 17 °C 5 mm 1 353 h –
29 Sacramento United States 32 °C 32 °C 15 °C 3 mm 1 355 h –
30 Lancaster United States 32 °C 32 °C 17 °C 3 mm 1 355 h –
31 Corona United States 32 °C 32 °C 18 °C 5 mm 1 352 h –
32 Carrefour Haiti 32 °C 32 °C 25 °C 172 mm 22 327 h 30 °C
33 Campeche Mexico 32 °C 32 °C 25 °C 175 mm 23 329 h 30 °C
34 Culiacán Mexico 32 °C 32 °C 24 °C 178 mm 19 299 h –
35 San Antonio United States 32 °C 32 °C 22 °C 84 mm 8 312 h –
36 Austin United States 32 °C 32 °C 22 °C 82 mm 8 309 h –
37 Holguín Cuba 32 °C 32 °C 24 °C 135 mm 20 338 h –
38 Ontario United States 32 °C 32 °C 18 °C 5 mm 1 350 h –
39 Santa Clarita United States 32 °C 32 °C 18 °C 4 mm 1 354 h –
40 Las Tunas Cuba 32 °C 32 °C 24 °C 167 mm 22 332 h –
41 Saint-Marc Haiti 31 °C 31 °C 25 °C 101 mm 20 330 h 30 °C
42 Palmdale United States 31 °C 31 °C 18 °C 10 mm 2 356 h –
43 Camagüey Cuba 31 °C 31 °C 24 °C 159 mm 22 325 h –
44 Port-de-Paix Haiti 31 °C 31 °C 26 °C 138 mm 22 335 h 29 °C
45 Los Angeles United States 31 °C 31 °C 17 °C 3 mm 1 350 h 20 °C
46 Moreno Valley United States 31 °C 31 °C 17 °C 7 mm 2 353 h –
47 Elk Grove United States 31 °C 31 °C 15 °C 4 mm 1 355 h –
48 Ciudad Juárez Mexico 31 °C 31 °C 18 °C 31 mm 4 343 h –
49 Cienfuegos Cuba 31 °C 31 °C 25 °C 135 mm 20 316 h –
50 Pomona United States 31 °C 31 °C 17 °C 4 mm 1 350 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

August: top 5

  1. Mexicali 42 °C
  2. San Luis Río Colorado 41 °C
  3. Phoenix 40 °C
  4. Mesa 40 °C
  5. Henderson 39 °C

Full ranking for August

October: top 5

  1. Nuuk 0.2 °C
  2. Anchorage 5.0 °C
  3. Edmonton 9.6 °C
  4. Saskatoon 9.8 °C
  5. Regina 10 °C

Full ranking for October

How this ranking is built

What is ranked
The average daily high temperature, in °C, in September, 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.