January weather forecast
Nantes, Brazil

January, the same as December, is another warm summer month in Nantes, Brazil, with temperature in the range of an average low of 21.3°C (70.3°F) and an average high of 29.3°C (84.7°F).

Temperature

The commencement of January introduces an average high-temperature of a moderately hot 29.3°C (84.7°F), closely mirroring the preceding month. Nantes reports a consistent average low-temperature of 21.3°C (70.3°F) throughout January nights.

Heat index

The average heat index in January is appraised at a very hot 36°C (96.8°F). Incorporate additional preventive steps, heat exhaustion and heat cramps are possible. Long-lasting activity may cause heatstroke.
Note that heat index values are valued for light wind and location in the shade. 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 'felt air temperature' or 'feels like', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. This effect is personal, shaped by the individual's physical activity and heat sensitivity, influenced by factors including wind, clothing, and metabolic variances. Direct exposure to sun rays can potentially augment the heat sensation, elevating the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular importance for children. Young ones are generally more prone to risk than adults due to their reduced ability to sweat. Their large skin surface area relative to their diminutive bodies and elevated heat production from their activities further enhance this risk.
Evaporating sweat, an outcome of perspiration, is key in assisting the human body to moderate its temperature. In circumstances of high air temperature and humidity (high heat index), the body's perspiration is restricted, heightening the feeling of warmth. Excessive heat gain, when not shed effectively by the body, can result in increasing body temperatures and related hazards.

Humidity

In Nantes, the average relative humidity in January is 83%.

Rainfall

The month with the most rainfall is January, when the rain falls for 28.5 days and typically aggregates up to 233mm (9.17") of precipitation.

Daylight

The average length of the day in January is 13h and 20min.
On the first day of the month, sunrise is at 05:43 and sunset at 19:13. On the last day of January, sunrise is at 06:04 and sunset at 19:12 -03.

Sunshine

January has the least sunshine of the year in Nantes, with an average of 7.4h of sunshine.

UV index

The months with the highest UV index are January through March, June through December, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The maximum UV index of 6 during January leads to these instructions:
Resist extreme sun exposure. Guarding against solar damage is essential. During the period from 10 a.m. to 4 p.m., UV radiation is highest. Try to avoid direct sunlight during these hours. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.