January weather forecast
São Mateus do Maranhão, Brazil

January, like December, is another hot summer month in São Mateus do Maranhão, Brazil, with an average temperature varying between 31.1°C (88°F) and 22.3°C (72.1°F).

Temperature

With the onset of January, the average high-temperature stands at a still hot 31.1°C (88°F), closely aligned with December's 33.1°C (91.6°F). The average temperature during January nights in São Mateus do Maranhão is registered at a pleasant 22.3°C (72.1°F).

Heat index

For January, the heat index is appraised at a scorching 43°C (109.4°F). Beware: Heat exhaustion along with heat cramps are on the cards. Heatstroke could result from sustained physical activity.
It is crucial to understand that heat index figures are for shade and gentle wind conditions. Direct sunlight might cause an increase of up to 15 Fahrenheit (8 Celsius) degrees in the heat index.
Note: The heat index, also known as 'real feel' or 'apparent temperature', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. The influence of weather is personal, with varied individuals experiencing it differently due to differences in body mass, stature, and physical exertion levels. Taking into account that direct sunlight can boost the heat effect, the heat index may rise by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Children often miss understanding the importance of rest and rehydration. Thirst usually appears late during dehydration - therefore, maintaining hydration, particularly during long physical activities, is essential.
Sweat evaporation plays a crucial role in cooling the human body, a process enabled by perspiration. In high relative humidity, the body's ability to evaporate heat is diminished, resulting in a heightened feeling of warmth. Accumulating heat beyond the body's cooling measures leads to rising temperatures and potential ailments.

Humidity

In São Mateus do Maranhão, the average relative humidity in January is 85%.

Rainfall

In São Mateus do Maranhão, in January, during 28.7 rainfall days, 186mm (7.32") of precipitation is typically accumulated. Throughout the year, there are 247.2 rainfall days, and 1281mm (50.43") of precipitation is accumulated.

Daylight

In January, the average length of the day is 12h and 20min.
On the first day of the month, sunrise is at 05:50 and sunset at 18:11. On the last day of January, in São Mateus do Maranhão, sunrise is at 06:02 and sunset at 18:19 -03.

Sunshine

In São Mateus do Maranhão, the average sunshine in January is 7.3h.

UV index

January, July through November, with an average maximum UV index of 7, are months with the highest UV index in São Mateus do Maranhão. A UV Index of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to UV radiation for average individuals.
Note: The maximum daily UV index of 7 during January translates into the following directions:
Undertake precautions and comply with sun safety standards. Protection from skin and eye injury is vital. UV radiation from the Sun is most intense between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. Experience reduced UV exposure by about half when donning a wide-brim hat.