January weather forecast
Angra dos Reis, Brazil

Starting the new year, Angra dos Reis encompasses a tropical climate with high humidity. From a climatological viewpoint, January is the hottest month with temperatures fluctuating from 22.6°C (72.7°F) to 29.8°C (85.6°F). Downpours are frequent, offering a refreshing break from the heat. Sunlight is fairly abundant with an average daily sunshine duration of five hours. The UV index reaches its peak in January, emphasizing the necessity of sunscreen while outdoors.

Temperature

The onset of January marks an average high-temperature of a still moderately hot 29.8°C (85.6°F), hardly differing from December's 28.6°C (83.5°F). Angra dos Reis encounters a steady low-temperature average of 22.6°C (72.7°F) throughout the month of January.

Heat index

Throughout January, the heat index is calculated to be a sweltering 37°C (98.6°F). Ensure additional precautions, heat exhaustion and heat cramps may be expected. Heatstroke could occur from sustained activity.
Heat index guidelines indicate values are for light wind scenarios and shaded regions. Facing direct sunlight may hike up the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'apparent temperature', is found by incorporating humidity levels into the air temperature measurement. Additional elements including metabolic differences, the level of physical activity, and attire have a role in shaping the individual's temperature perception. Exposure to direct sun rays can influence the heat you feel, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Kids frequently fail to realize the necessity for resting and hydrating. Thirst is an advanced indication of dehydration - hence, maintaining hydration, especially during extended physical activities, becomes essential.
One way the human body deals with excessive warmth is by perspiring and allowing sweat to evaporate. Greater relative humidity lessens the rate of evaporation, thus decreasing the body's heat dispersal, which gives rise to a sensation of overheating. The body faces dehydration threats when its cooling efforts are outpaced by excessive heat gain.

Humidity

In January, the average relative humidity is 81%.

Rainfall

The month with the most rainfall is January, when the rain falls for 19 days and typically aggregates up to 276mm (10.87") of precipitation.

Sea temperature

In Angra dos Reis, in January, the average water temperature is 25.6°C (78.1°F).
Note: Surface water temperatures ranging from 25°C (77°F) to 29°C (84.2°F) are seen as ideal and highly pleasant for extended enjoyment in all water activities.

Daylight

In January, the average length of the day in Angra dos Reis is 13h and 22min.
On the first day of January, sunrise is at 05:14 and sunset at 18:46. On the last day of the month, sunrise is at 05:36 and sunset at 18:45 -03.

Sunshine

In Angra dos Reis, the average sunshine in January is 5h.

UV index

January through March, November 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 extreme health hazard from unsafe exposure to UV radiation for ordinary individuals.
Note: A typical high UV index of 12 in January suggests the following recommendations:
Take all critical precautions, unprotected skin might burn swiftly. The Sun emits the most powerful UV radiation between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key. Sunscreen with an SPF of 30 or higher should be applied generously and frequently reapplied even on cloudy days, especially after each swim or outdoor workout. Heads up! UV intensity is amplified by reflections from water and sand.