SeasonMapMar del Plata weather in September
Argentina
September in Mar del Plata: cool, a little rain, with clean air — a great time to visit.
#8 of 12 months in Mar del Plata · #937 of 1383 destinations to visit in September · comfort 70/100 (tier B)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Mar del Plata in September
Other months in Mar del Plata
Mar del Plata's forum calls January ultra-peak season on the Argentine coast, warm but not unbearable, with the beaches at their most crowded of the year. Regulars flag it as the height of the Christmas-to-February summer holiday stretch, and suggest early March as a calmer, still-warm alternative once schools are back in session.
Add your own note from Mar del Plata's card on the map.
Mar del Plata climate normals — September
| Daytime high | 17°C / 63°F | 🙂 cool |
|---|---|---|
| Nighttime low | 6°C / 42°F | |
| Feels like (high) | 15°C / 59°F | |
| Sea temperature | 11°C / 51°F | 🥶 cold sea |
| Rainfall | 59 mm / 2.3 in | 🌦 some rain |
| Rainy days | 7 days | |
| Humidity | 77% | 💦 very humid |
| Dew point | 7°C / 44°F | |
| Sunshine | 8.6 h/day | |
| Daylight | 11.9 h | |
| Wind | 23 km/h / 14 mph | |
| Air quality (US AQI) | 27 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Mar del Plata in September
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
Shoulder seasonschool holidays in 2 of the markets that fill it, an ordinary month(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Mar del Plata's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Fair weatherMar del Plata's weather peaks January–March.
Best weatherFair weatherToughest weather
Where is Mar del Plata?
Mar del Plata in September — FAQ
- Is September a good time to visit Mar del Plata?
- September in Mar del Plata: cool, a little rain, with clean air — a great time to visit. It ranks #8 of 12 months for Mar del Plata on SeasonMap's comfort score (70/100).
- What is the weather like in Mar del Plata in September?
- In September, Mar del Plata averages a daily high of 17.4°C and a low of 5.6°C, with about 58.9 mm of rain over roughly 7.1 rainy days.
- What is the air quality in Mar del Plata in September?
- Mar del Plata has a mean US Air Quality Index of about 27 in September.