January weather forecast
Rosario, Argentina

The year in Rosario starts off with January being one of the warmest months, with daily highs peaking at 33.4°C (92.1°F). Typically, the day extends to 14 hours of daylight filled primarily with sunshine. Sunlight is radiated for nearly two-thirds of the day, generating a UV index of 7, necessitating appropriate protective measures for outdoor activities. Despite the high temperatures, the month experiences a substantial amount of rainfall. As the month progresses, the weather in Rosario gracefully transitions into the second month of the year, February.

Temperature

In Rosario, the month of January is known for its highest average temperatures, reaching a high of 33.4°C (92.1°F) and a low of 18.8°C (65.8°F).

Heat index

January's heat index is computed to be a torrid 38°C (100.4°F). Exercise increased caution, heat cramps and heat exhaustion are potential hazards. Continuous activity could lead to heatstroke.
Heat index guidelines indicate values are for light wind scenarios and shaded regions. In the presence of direct sunshine, the heat index could be augmented by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', measures the perceived warmth when incorporating the humidity present in the air. The influence of weather is personal, differing among individuals based on variations in body mass, stature, and the degree of physical exertion. Taking into account that direct sunlight can boost the heat effect, the heat index may rise by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Kids generally face higher risks than adults as they sweat less. Along with their large skin surface compared to their small bodies and higher heat production due to their activities, their vulnerability is increased.
The natural method the human body uses to remove excess heat is by perspiring and letting sweat evaporate. With excessive moisture in the atmosphere, the effectiveness of the evaporation process is decreased, causing the body to cool down less efficiently, leading to a sensation of overheating. Temperature imbalances caused by excessive heat retention can trigger heat-related maladies.

Humidity

With an average relative humidity of 52%, January is the least humid month.

Rainfall

In January, the rain falls for 7.8 days. Throughout January, 45mm (1.77") of precipitation is accumulated. In Rosario, during the entire year, the rain falls for 89.9 days and collects up to 475mm (18.7") of precipitation.

Daylight

In January, the average length of the day is 14h and 2min.
On the first day of January, sunrise is at 05:57 and sunset at 20:14. On the last day of the month, sunrise is at 06:24 and sunset at 20:07 -03.

Sunshine

In Rosario, the average sunshine in January is 9.5h.

UV index

The month with the highest UV index in Rosario is January, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to UV radiation for the average person.
Note: An average UV index of 7 in January transforms into this advice:
Skirt overexposure. People with light complexions might get scorched in under 20 minutes. Avoid direct sunlight between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Keep in mind that shade structures may not provide complete protection. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses.