Where is the sea warmest in South America?
The warmest water in South America month by month, across 125 coastal cities — and how many of them are comfortable enough to swim in.
| Month | Warmest city | Sea | Comfortable |
|---|---|---|---|
| January | Santiago de Tolú | 29.4°C | 107 of 125 |
| February | Santiago de Tolú | 29.1°C | 108 of 125 |
| March | Natal | 29.1°C | 105 of 125 |
| April | Santiago de Tolú | 29.5°C | 102 of 125 |
| May | Santiago de Tolú | 30.1°C | 76 of 125 |
| June | Santiago de Tolú | 30.1°C | 75 of 125 |
| July | Santiago de Tolú | 30.4°C | 72 of 125 |
| August | Santiago de Tolú | 30.3°C | 71 of 125 |
| September | Los Puertos de Altagracia | 30.5°C | 72 of 125 |
| October | Los Puertos de Altagracia | 30.5°C | 77 of 125 |
| November | Macapá | 30.0°C | 84 of 125 |
| December | Santiago de Tolú | 29.8°C | 95 of 125 |
"Comfortable" means at least 19.0°C, which is a judgement and not a fact — a Norwegian and a Spaniard genuinely disagree. Every city page shows the season at four thresholds instead of insisting on one. Method and sources