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

Stanley tops the list at 6.6 °C in September. Ranked from 1991–2020 climate normals across 50 destinations in South America.

Top three in September: Stanley (6.6 °C) , Puerto Montt (12 °C) , La Paz (14 °C) . Between first and 50th place the avg high differs by 14 °C.

# Destination Country Avg high Avg high Avg low Rainfall Wet days Sunshine Sea temp
1 Stanley Falkland Islands 6.6 °C 6.6 °C 2.5 °C 38 mm 9 240 h 5.1 °C
2 Puerto Montt Chile 12 °C 12 °C 5.8 °C 181 mm 18 248 h 11 °C
3 La Paz Bolivia 14 °C 14 °C 2.4 °C 39 mm 12 334 h –
4 Temuco Chile 14 °C 14 °C 4.8 °C 111 mm 12 256 h –
5 Valparaíso Chile 14 °C 14 °C 10 °C 25 mm 3 315 h 13 °C
6 Talcahuano Chile 15 °C 15 °C 7.7 °C 65 mm 7 298 h 12 °C
7 Mar del Plata Argentina 15 °C 15 °C 7.7 °C 57 mm 7 272 h 11 °C
8 Concepción Chile 15 °C 15 °C 7.0 °C 66 mm 7 297 h 12 °C
9 Montevideo Uruguay 16 °C 16 °C 11 °C 84 mm 8 260 h 13 °C
10 Juliaca Peru 16 °C 16 °C 1.2 °C 46 mm 10 337 h –
11 Huancayo Peru 16 °C 16 °C 6.6 °C 85 mm 22 334 h –
12 Chillán Chile 16 °C 16 °C 5.6 °C 96 mm 7 287 h –
13 Cusco Peru 16 °C 16 °C 6.5 °C 38 mm 12 330 h –
14 Peñalolén Chile 17 °C 17 °C 4.6 °C 71 mm 8 292 h –
15 Oruro Bolivia 17 °C 17 °C 1.1 °C 22 mm 6 338 h –
16 Rio Grande Brazil 17 °C 17 °C 14 °C 133 mm 10 243 h 15 °C
17 La Plata Argentina 17 °C 17 °C 10 °C 72 mm 7 273 h 15 °C
18 Puente Alto Chile 17 °C 17 °C 4.4 °C 73 mm 8 292 h –
19 Tunja Colombia 17 °C 17 °C 7.9 °C 103 mm 24 311 h –
20 Viña del Mar Chile 17 °C 17 °C 9.5 °C 25 mm 3 314 h 13 °C
21 Quito Ecuador 17 °C 17 °C 8.9 °C 189 mm 26 291 h –
22 Buenos Aires Argentina 17 °C 17 °C 11 °C 79 mm 7 274 h 15 °C
23 Talca Chile 18 °C 18 °C 6.3 °C 61 mm 6 289 h –
24 Avellaneda Argentina 18 °C 18 °C 10 °C 75 mm 7 271 h 15 °C
25 Ambato Ecuador 18 °C 18 °C 8.5 °C 109 mm 22 330 h –
26 Bahía Blanca Argentina 18 °C 18 °C 8.1 °C 45 mm 6 286 h 11 °C
27 Rancagua Chile 18 °C 18 °C 5.0 °C 80 mm 9 286 h –
28 Santiago Chile 18 °C 18 °C 5.6 °C 55 mm 7 296 h –
29 Latacunga Ecuador 18 °C 18 °C 8.2 °C 97 mm 22 324 h –
30 Cuenca Ecuador 18 °C 18 °C 9.5 °C 68 mm 16 312 h –
31 Neuquén Argentina 18 °C 18 °C 6.5 °C 19 mm 3 296 h –
32 Arica Chile 18 °C 18 °C 13 °C 13 mm 3 339 h 17 °C
33 Merlo Argentina 19 °C 19 °C 9.2 °C 71 mm 7 270 h –
34 Maipú Chile 19 °C 19 °C 6.3 °C 54 mm 7 296 h –
35 Pelotas Brazil 19 °C 19 °C 13 °C 140 mm 11 237 h –
36 Coquimbo Chile 19 °C 19 °C 11 °C 6 mm 1 311 h 13 °C
37 Pasto Colombia 19 °C 19 °C 10 °C 107 mm 20 319 h –
38 Santa Anita - Los Ficus Peru 19 °C 19 °C 14 °C 2 mm 0 348 h 17 °C
39 Lages Brazil 19 °C 19 °C 10 °C 165 mm 12 216 h –
40 Caxias do Sul Brazil 19 °C 19 °C 9.9 °C 171 mm 13 234 h –
41 Riobamba Ecuador 19 °C 19 °C 8.8 °C 48 mm 11 319 h –
42 San Salvador de Jujuy Argentina 19 °C 19 °C 9.4 °C 118 mm 15 326 h –
43 Bogotá Colombia 20 °C 20 °C 11 °C 30 mm 9 320 h –
44 Antofagasta Chile 20 °C 20 °C 13 °C 1 mm 0 340 h 15 °C
45 Callao Peru 20 °C 20 °C 15 °C 2 mm 0 349 h 17 °C
46 Cajamarca Peru 20 °C 20 °C 9.6 °C 151 mm 18 337 h –
47 La Serena Chile 20 °C 20 °C 12 °C 6 mm 1 311 h 13 °C
48 Chimbote Peru 20 °C 20 °C 15 °C 1 mm 0 343 h 17 °C
49 Soacha Colombia 20 °C 20 °C 11 °C 103 mm 13 308 h –
50 Río Cuarto Argentina 20 °C 20 °C 9.3 °C 39 mm 5 292 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. Stanley 5.5 °C
  2. Puerto Montt 10 °C
  3. Temuco 12 °C
  4. La Paz 13 °C
  5. Talcahuano 13 °C

Full ranking for August

October: top 5

  1. Stanley 8.7 °C
  2. Puerto Montt 14 °C
  3. La Paz 14 °C
  4. Valparaíso 15 °C
  5. Temuco 16 °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 South 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.