Rosario weather in January
January in Rosario: hot, rainy, with clean air — an excellent time to visit.
#12 of 12 months in Rosario · #310 of 897 destinations to visit in January · comfort 80/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Rosario in January
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Rosario climate normals — January
| Daytime high | 31°C / 88°F | 🥵 hot |
|---|---|---|
| Nighttime low | 21°C / 70°F | |
| Rainfall | 112 mm / 4.4 in | 🌧 rainy |
| Rainy days | 10 days | |
| Humidity | 53% | 🍃 comfortable |
| Dew point | 16°C / 61°F | |
| Sunshine | 11.3 h/day | |
| Daylight | 14 h | |
| Wind | 16 km/h / 10 mph | |
| Air quality (US AQI) | 29 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Rosario in January — FAQ
- Is January a good time to visit Rosario?
- January in Rosario: hot, rainy, with clean air — an excellent time to visit. It ranks #12 of 12 months for Rosario on SeasonMap's comfort score (80/100).
- What is the weather like in Rosario in January?
- In January, Rosario averages a daily high of 31.2°C and a low of 21°C, with about 112.1 mm of rain over roughly 9.8 rainy days.
- What is the air quality in Rosario in January?
- Rosario has a mean US Air Quality Index of about 29 in January.