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The warmest places in North America in September

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

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

Only destinations with a published page for that month are ranked. The ranking is ours; the underlying values are reproduced from the source.

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.