Rosario weather in September
September in Rosario: nice, dry, with clean air — an excellent time to visit.
#3 of 12 months in Rosario · #110 of 897 destinations to visit in September · comfort 92/100 (tier S)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Rosario in September
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Rosario climate normals — September
| Daytime high | 22°C / 71°F | 😎 nice |
|---|---|---|
| Nighttime low | 10°C / 51°F | |
| Rainfall | 29 mm / 1.1 in | ☀️ dry |
| Rainy days | 4 days | |
| Humidity | 60% | 🍃 comfortable |
| Dew point | 7°C / 44°F | |
| Sunshine | 9.3 h/day | |
| Daylight | 11.9 h | |
| Wind | 18 km/h / 11 mph | |
| Air quality (US AQI) | 31 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Rosario in September — FAQ
- Is September a good time to visit Rosario?
- September in Rosario: nice, dry, with clean air — an excellent time to visit. It ranks #3 of 12 months for Rosario on SeasonMap's comfort score (92/100).
- What is the weather like in Rosario in September?
- In September, Rosario averages a daily high of 21.5°C and a low of 10.3°C, with about 28.9 mm of rain over roughly 3.6 rainy days.
- What is the air quality in Rosario in September?
- Rosario has a mean US Air Quality Index of about 31 in September.