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

Nuuk tops the list at 6.8 °C in September. Ranked from 1991–2020 climate normals across 50 destinations in North America.

Top three in September: Nuuk (6.8 °C) , Anchorage (12 °C) , Saint-Pierre (15 °C) . Between first and 50th place the avg high differs by 16 °C.

# Destination Country Avg high Avg high Avg low Rainfall Wet days Sunshine Sea temp
1 Nuuk Greenland 6.8 °C 6.8 °C 1.4 °C 100 mm 12 216 h 3.9 °C
2 Anchorage United States 12 °C 12 °C 6.5 °C 138 mm 17 225 h 12 °C
3 Saint-Pierre Saint Pierre and Miquelon 15 °C 15 °C 13 °C 126 mm 11 252 h 14 °C
4 Edmonton Canada 18 °C 18 °C 7.4 °C 39 mm 7 288 h –
5 Victoria Canada 18 °C 18 °C 12 °C 44 mm 7 317 h 11 °C
6 Toluca Mexico 18 °C 18 °C 9.7 °C 194 mm 23 275 h –
7 Delegación Cuajimalpa de Morelos Mexico 19 °C 19 °C 10 °C 200 mm 23 271 h –
8 Calgary Canada 19 °C 19 °C 5.7 °C 43 mm 7 297 h –
9 Quetzaltenango Guatemala 19 °C 19 °C 13 °C 469 mm 30 263 h –
10 Greater Sudbury Canada 19 °C 19 °C 11 °C 93 mm 11 265 h –
11 Halifax Canada 19 °C 19 °C 14 °C 100 mm 9 259 h 16 °C
12 Québec Canada 19 °C 19 °C 11 °C 110 mm 11 259 h –
13 Saskatoon Canada 19 °C 19 °C 8.2 °C 38 mm 6 288 h –
14 Vancouver Canada 19 °C 19 °C 12 °C 117 mm 10 301 h 14 °C
15 Winnipeg Canada 19 °C 19 °C 9.9 °C 67 mm 8 279 h –
16 Regina Canada 19 °C 19 °C 8.3 °C 40 mm 7 289 h –
17 Montréal Canada 19 °C 19 °C 11 °C 98 mm 10 276 h –
18 Pachuca de Soto Mexico 20 °C 20 °C 11 °C 123 mm 17 278 h –
19 Richmond Canada 20 °C 20 °C 12 °C 116 mm 10 301 h 14 °C
20 Magdalena Contreras Mexico 20 °C 20 °C 11 °C 194 mm 23 272 h –
21 Nicolás Romero Mexico 20 °C 20 °C 11 °C 136 mm 19 275 h –
22 Burnaby Canada 20 °C 20 °C 12 °C 122 mm 10 299 h 14 °C
23 Cuautitlán Izcalli Mexico 20 °C 20 °C 12 °C 128 mm 19 276 h –
24 Surrey Canada 20 °C 20 °C 11 °C 86 mm 9 307 h 14 °C
25 San Cristóbal de las Casas Mexico 21 °C 21 °C 13 °C 428 mm 26 274 h –
26 Laval Canada 21 °C 21 °C 12 °C 90 mm 10 277 h –
27 San Martin Texmelucan de Labastida Mexico 21 °C 21 °C 12 °C 152 mm 20 277 h –
28 Ottawa Canada 21 °C 21 °C 12 °C 95 mm 10 268 h –
29 Longueuil Canada 21 °C 21 °C 13 °C 98 mm 10 276 h –
30 Xico Mexico 21 °C 21 °C 12 °C 254 mm 23 277 h –
31 Kitchener Canada 21 °C 21 °C 12 °C 80 mm 9 285 h –
32 Oshawa Canada 21 °C 21 °C 15 °C 80 mm 9 293 h –
33 Toronto Canada 21 °C 21 °C 14 °C 69 mm 9 292 h –
34 Puebla Mexico 21 °C 21 °C 13 °C 178 mm 21 295 h –
35 Markham Canada 21 °C 21 °C 13 °C 77 mm 10 290 h –
36 Seattle United States 21 °C 21 °C 12 °C 64 mm 8 305 h –
37 Brampton Canada 21 °C 21 °C 13 °C 71 mm 9 290 h –
38 Buffalo United States 21 °C 21 °C 15 °C 88 mm 9 291 h –
39 Etobicoke Canada 22 °C 22 °C 14 °C 69 mm 9 292 h –
40 Milwaukee United States 22 °C 22 °C 16 °C 74 mm 9 292 h –
41 London Canada 22 °C 22 °C 13 °C 85 mm 9 298 h –
42 Tacoma United States 22 °C 22 °C 12 °C 50 mm 7 306 h –
43 Hamilton Canada 22 °C 22 °C 15 °C 75 mm 9 292 h –
44 Guadalupe Mexico 22 °C 22 °C 12 °C 104 mm 13 317 h –
45 Rochester United States 22 °C 22 °C 15 °C 87 mm 11 288 h –
46 Minneapolis United States 22 °C 22 °C 14 °C 82 mm 9 287 h –
47 Worcester United States 22 °C 22 °C 14 °C 95 mm 8 268 h –
48 Grand Rapids United States 22 °C 22 °C 14 °C 77 mm 9 291 h –
49 Madison United States 22 °C 22 °C 14 °C 84 mm 9 286 h –
50 Morelia Mexico 23 °C 23 °C 14 °C 120 mm 20 290 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, lowest 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.