January weather forecast
São Mateus, Brazil

January, the same as December, is a moderately hot summer month in São Mateus, Brazil, with an average temperature ranging between min 22.9°C (73.2°F) and max 29.7°C (85.5°F).

Temperature

São Mateus, Brazil, starts January with an average high-temperature of a still warm 29.7°C (85.5°F), hinting at a minimal fluctuation from December. During January nights, São Mateus records an average temperature of 22.9°C (73.2°F).

Heat index

The average heat index in January is appraised at a fiery hot 37°C (98.6°F). Greater safety measures are needed, risk of heat exhaustion and heat cramps is high. Continuous activity might trigger heatstroke.
Research indicates the heat index considers values in shaded locales and with light winds. The heat index could see an increase by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'real feel' or 'feels like', gauges the sensation of temperature factoring in the air's moisture content. This effect is subjective, differing among individuals based on their physical activity and perception of heat, which can be influenced by factors like wind, clothing, and metabolic variances. 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 extremely vital to babies and toddlers. 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.
The human body keeps its cool primarily through perspiration, as this process enables sweat to evaporate, taking away the excess heat. During conditions of high air temperature and humidity (high heat index), the body's ability to perspire is inhibited, increasing the sensation of warmth. Rising body temperatures resulting from an imbalance in heat absorption can lead to potential thermal issues.

Humidity

The average relative humidity in January is 80%.

Rainfall

In January, the rain falls for 18.1 days. Throughout January, 76mm (2.99") of precipitation is accumulated. In São Mateus, Brazil, during the entire year, the rain falls for 194.6 days and collects up to 770mm (30.31") of precipitation.

Daylight

In January, the average length of the day is 13h and 7min.
On the first day of the month, sunrise is at 05:05 and sunset at 18:19. On the last day of January, in São Mateus, sunrise is at 05:24 and sunset at 18:20 -03.

Sunshine

The average sunshine in January is 8.5h.

UV index

The months with the highest UV index in São Mateus are January through March and December, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health risk from unprotected exposure to Sun's UV rays for the ordinary person.
Note: A maximum UV index of 7 in January translates into the following recommendations:
Beware of overexposure. Fair-skinned individuals risk burning in less than 20 minutes. 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. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.