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

The warmest temperatures in Montevideo occur during January, when averages reach a peak of 28.4°C (83.1°F) and a low of 18°C (64.4°F).

Heat index

The heat index value during January is estimated at a tropical 31°C (87.8°F). Extended exposure and activity might lead to tiredness, potentially resulting in heat cramps.
Remember that heat index calculations are made for conditions in the shade with light wind. Heat index values might soar by up to 15 Fahrenheit (8 Celsius) degrees with exposure to direct sunshine.
Note: The heat index, also known as 'real feel' or 'apparent temperature', binds temperature metrics with humidity values to give a sense of the actual warmth. The effect is personal, with varied weather perceptions among individuals due to differences in body mass, stature, and physical activity. Realize that direct exposure to sunlight can augment the felt heat, leading to a potential increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. Young ones often ignore the need to take a break and drink fluids. Thirst is a late-stage symptom of dehydration - hence, maintaining hydration, particularly during extended physical activities, is crucial.

Humidity

The average relative humidity in January is 68%.

Rainfall

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

Sea temperature

January is the month with the warmest seawater, with an average sea temperature of 24.2°C (75.6°F).
Note: Your comfort in 24.2°C (75.6°F) waters hinges on your relationship with the cold, today's sunny disposition, wind patterns, and the air's temperature. For context, Olympic swimmers are no strangers to waters of 25°C (77°F) to 28°C (82.4°F).

Daylight

In Montevideo, Uruguay, the average length of the day in January is 14h and 11min.
On the first day of January in Montevideo, sunrise is at 05:34 and sunset at 20:01. On the last day of the month, 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 in Montevideo. A UV Index reading of 11, and higher, represents an extreme threat to health from exposure to the Sun's UV radiation for the ordinary person.
Note: The maximum UV index of 12 during January leads to these instructions:
Implement every essential safety step. Individuals with fair skin might receive burns in less than 5 minutes. The Sun's UV radiation is most potent between 10 a.m. and 4 p.m. Try to limit direct exposure to the Sun during this period. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days. Apply and frequently reapply a broad-spectrum SPF 30+ sunscreen after every two hours, or immediately after a swim or outdoor exercise. Attention! UV radiation is ramped up when reflecting off sand and water surfaces.