Rosario weather in January
January is one of the least pleasant months in Rosario: highs of 33°C (91°F) and about 123 mm (4.8 in) of rain on average. Nights average 19°C (66°F) and cloud cover 50% (NASA POWER, 2001–2025 averages). It is the 4th wettest month of the year and the warmest. Compared with December, it is warmer and about as wet; February brings highs of 31°C (87°F) and 139 mm (5.5 in) of rain.
Is January a good time to visit Rosario?
least pleasant month Weather score 62/100.
January is one of the least pleasant months for weather in Rosario. For better conditions, consider May, Aug–Sep.
Does it rain a lot in Rosario in January?
Some rain is normal: about 123 mm (4.8 in) falls in an average January. It is the 4th wettest month of the year.
How warm is Rosario in January?
Days average 33°C (91°F) and nights 19°C (66°F).
Rosario weather by month
| Month | High | Low | Rain | Cloud | Weather |
|---|---|---|---|---|---|
| January | 33°C (91°F) | 19°C (66°F) | 123 mm | 50% | least pleasant |
| February | 31°C (87°F) | 18°C (64°F) | 139 mm | 58% | least pleasant |
| March | 28°C (83°F) | 16°C (60°F) | 148 mm | 46% | least pleasant |
| April | 24°C (75°F) | 12°C (53°F) | 111 mm | 49% | fair |
| May | 19°C (66°F) | 9°C (47°F) | 52 mm | 54% | best |
| June | 16°C (61°F) | 5°C (41°F) | 22 mm | 52% | fair |
| July | 16°C (60°F) | 4°C (40°F) | 26 mm | 53% | fair |
| August | 18°C (65°F) | 6°C (42°F) | 38 mm | 47% | best |
| September | 22°C (71°F) | 8°C (47°F) | 58 mm | 48% | best |
| October | 25°C (78°F) | 12°C (53°F) | 122 mm | 51% | fair |
| November | 29°C (84°F) | 15°C (58°F) | 109 mm | 46% | fair |
| December | 32°C (89°F) | 17°C (63°F) | 142 mm | 49% | least pleasant |
Sources: 2001–2025 monthly averages from NASA POWER (MERRA-2 reanalysis). Page updated . How we rate months