Rosario weather in December
December in Rosario: hot, a little rain, with clean air — an excellent time to visit.
#8 of 12 months in Rosario · #171 of 897 destinations to visit in December · comfort 85/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Rosario in December
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Rosario climate normals — December
| Daytime high | 30°C / 87°F | 🥵 hot |
|---|---|---|
| Nighttime low | 19°C / 67°F | |
| Rainfall | 75 mm / 2.9 in | 🌦 some rain |
| Rainy days | 7 days | |
| Humidity | 58% | 🍃 comfortable |
| Dew point | 15°C / 59°F | |
| Sunshine | 11.8 h/day | |
| Daylight | 14.3 h | |
| Wind | 18 km/h / 11 mph | |
| Air quality (US AQI) | 30 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Rosario in December — FAQ
- Is December a good time to visit Rosario?
- December in Rosario: hot, a little rain, with clean air — an excellent time to visit. It ranks #8 of 12 months for Rosario on SeasonMap's comfort score (85/100).
- What is the weather like in Rosario in December?
- In December, Rosario averages a daily high of 30.4°C and a low of 19.2°C, with about 74.8 mm of rain over roughly 7.2 rainy days.
- What is the air quality in Rosario in December?
- Rosario has a mean US Air Quality Index of about 30 in December.