January weather forecast
Jacarepaguá, Brazil

January is a hot summer month in Jacarepaguá, Brazil, with an average temperature ranging between min 23.3°C (73.9°F) and max 30.3°C (86.5°F).

Temperature

January's onset records a minor alteration in the average high-temperature to a hot 30.3°C (86.5°F) from December's 29.1°C (84.4°F). Jacarepaguá experiences an average low-temperature reading of 23.3°C (73.9°F) throughout January.

Heat index

The heat index value during January is evaluated at a torrid 38°C (100.4°F). Apply extra caution, heat cramps and heat exhaustion could happen. Heatstroke might occur with long-duration activity.
Keep in mind the heat index values are meant for areas in shade and with light wind. Being under direct sunlight might amplify the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', is an amalgamation of air temperature and humidity to express the equivalent perceived temperature. The impact of weather is individual, with diverse individuals experiencing it differently due to variations in body mass, height, and activity levels. Always consider that direct sunlight exposure might heighten the heat's effects, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Young people are generally more susceptible than adults because they perspire less. Furthermore, their proportionally larger skin surface to their petite bodies and the increased heat output from their actions add to the risk.
The body's natural response to excessive warmth is perspiration, as it allows for cooling through sweat evaporation. Under conditions of high temperature and humidity (enhanced heat index), sweat production is compromised, exacerbating the sensation of warmth. When the body's heat gain surpasses its removal capacity, body temperature starts to climb, leading to potential heat-related ailments.

Humidity

In January, the average relative humidity is 79%.

Rainfall

In Jacarepaguá, in January, it is raining for 17.3 days, with typically 64mm (2.52") of accumulated precipitation. Throughout the year, in Jacarepaguá, there are 172 rainfall days, and 543mm (21.38") of precipitation is accumulated.

Daylight

In January, the average length of the day in Jacarepaguá is 13h and 22min.
On the first day of January in Jacarepaguá, sunrise is at 05:11 and sunset at 18:42. On the last day of the month, sunrise is at 05:32 and sunset at 18:41 -03.

Sunshine

The average sunshine in January is 8.4h.

UV index

The months with the highest UV index are January and December, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV rays for average individuals.
Note: In January, the average maximum UV index of 7 translates into the following recommendations:
Inhibit overexposure. Warding off sun damage is of utmost importance. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is particularly strong, noting that parasols or canopies may not offer total sun protection. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.