January weather forecast
São Fernando, Brazil

January, like December, is another tropical summer month in São Fernando, Brazil, with an average temperature fluctuating between 24.3°C (75.7°F) and 34.5°C (94.1°F).

Temperature

The advent of January signifies a minor shift to an average high-temperature of a still hot 34.5°C (94.1°F), aligning closely with December. January's average low-temperature reading settles at a moderately hot 24.3°C (75.7°F).

Heat index

Throughout January, the heat index is calculated to be a blisteringly hot 42°C (107.6°F). Undertake additional precautions, heat cramps and heat exhaustion could happen. Heatstroke could occur from sustained activity.
Heat index readings emphasize conditions of light breezes and shaded spots. If directly exposed to the sun, the heat index could rise by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', reflects the feeling of heat when considering both air temperature and humidity. Elements such as metabolic variations, pregnancy, and physical exertion can influence one's weather perception. Consider the sun's direct rays and their impact; they can potentially increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are essentially critical for children. Kids are usually in more danger than grown-ups as they tend to sweat less. Plus, their bigger skin surface in relation to their small frames and increased heat generation due to their activity level make them more susceptible.
Perspiration, which is the evaporation of sweat, is a primary way the human body manages and dispels excessive warmth. When the air holds a significant amount of moisture, the efficiency of the evaporation process is decreased, preventing the body from cooling down efficiently, leading to the sensation of overheating. Rising body temperatures resulting from an imbalance in heat absorption can lead to potential thermal issues.

Humidity

The average relative humidity in January in São Fernando is 56%.

Rainfall

In São Fernando, Brazil, in January, it is raining for 13.4 days, with typically 41mm (1.61") of accumulated precipitation. Throughout the year, there are 122.6 rainfall days, and 442mm (17.4") of precipitation is accumulated.

Daylight

In São Fernando, the average length of the day in January is 12h and 26min.
On the first day of the month, sunrise is at 05:17 and sunset at 17:46. On the last day of January, sunrise is at 05:30 and sunset at 17:53 -03.

Sunshine

The average sunshine in January is 9h.

UV index

The months with the highest UV index are January through December, with an average maximum UV index of 7. The months with the lowest UV index are January through December, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation for the average person.
Note: The maximum daily UV index, 7 in January, converts into the following recommendations:
Endorse precautions and be consistent with sun safety guidelines. Preventing sunburn is paramount. Attempt to stay under shade and limit exposure to the Sun between 10 a.m. and 4 p.m., when UV radiation is at its peak. Remember, devices such as parasols or canopies might not provide complete sun protection. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.