January weather forecast
Montevideo, Uruguay

The year starts in Montevideo, Uruguay with higher temperatures, hinting at strong summer weather conditions. A beach outing is desirable due to the warm sea temperature of 24.2°C (75.6°F). A slight decrease in temperature is observed from January to February. Sunshine fills the day, keeping the city vibrant and bustling. Despite the high temperature, the humidity of 68% maintains a degree of comfort.

Temperature

January, marked by an average high-temperature of 28.4°C (83.1°F) and a low-temperature of 18°C (64.4°F), is the warmest month.

Heat index

In January, the heat index is calculated to be a hot 31°C (87.8°F). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
It is important to note that the heat index values are for shaded areas and light wind scenarios. Direct exposure to sunshine could lead to a heat index increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', ties air temperature with relative humidity to produce the perceived temperature sensation. This impact is subjective, influenced by the person's physical activity and individual heat perception, affected by factors including wind, attire, and metabolic differences. In the direct sunlight, the weather's impact can be amplified, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Young individuals are typically more threatened than adults due to their reduced perspiration. Also, the larger skin surface proportionate to their small bodies and the increased heat from their activities magnify their risk.

Humidity

In January, the average relative humidity is 68%.

Rainfall

In Montevideo, in January, during 6 rainfall days, 87mm (3.43") of precipitation is typically accumulated. In Montevideo, during the entire year, the rain falls for 77 days and collects up to 1101mm (43.35") of precipitation.

Sea temperature

With an average sea temperature of 24.2°C (75.6°F), January is the month with the warmest seawater in Montevideo.
Note: The allure of a swim in 24.2°C (75.6°F) waters can be influenced by your feelings towards the cold, today's sunshine, the wind's touch, and the ambient warmth. To put it in perspective, Olympic standards demand water temperatures of 25°C (77°F) to 28°C (82.4°F).

Daylight

In Montevideo, the average length of the day in January is 14h and 11min.
On the first day of the month, sunrise is at 05:34 and sunset at 20:01. On the last day of January, sunrise is at 06:03 and sunset at 19:53 -03.

Sunshine

January has the most sunshine of the year, with an average of 9.5h of sunshine.

UV index

January and December, with an average maximum UV index of 12, are months with the highest UV index. A UV Index estimate of 11, and higher, represents an ultimate health vulnerability from unsafe exposure to UV radiation for ordinary individuals.
Note: The maximum daily UV index of 12 in January interprets into the following recommendations:
Employ all critical precautions. Guarding against sun damage is essential. From 10 a.m. to 4 p.m., when UV radiation is at its strongest, limit direct exposure to the Sun and note that shade structures may not provide full sun protection. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage. Following every swim or outdoor workout, a sunscreen with an SPF of not less than 30 should be liberally applied and re-applied frequently, even on overcast days. Notice! Sand and water reflections contribute to a stronger UV exposure.