January weather forecast
Teresina, Brazil

As the year begins in Teresina, Brazil, January is characterized by warm temperatures, continuous light showers, and slightly reduced sunshine hours. There is a significant amount of rainfall, with January experiencing a generous 235mm (9.25") spread across an average of 28.3 days. The weather remains humid throughout the month due to the continuous precipitation. Despite the rainfall, sunlight is not entirely obscured, allowing for relatively clear visibility. Overall, January in Teresina provides a warm and humid climate with frequent rain showers.

Temperature

As Teresina transitions from December to January, the average high-temperatures adjust to a still tropical 31.7°C (89.1°F), nearly the same as the previous 33.5°C (92.3°F). Teresina's temperature lowers to a mean of 22.9°C (73.2°F) during the nights in January.

Heat index

In January, the average heat index is calculated to be a scorching 42°C (107.6°F). Adopt heightened preventive measures, heat exhaustion and heat cramps are probable. Persistent activity could lead to heatstroke.
It is worth noting that heat index values are gauged for conditions in the shade and light breezes. The direct sun can potentially cause the heat index to increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', gauges the sensation of temperature factoring in the air's moisture content. Factors including metabolic differences, physical activity, and clothing are additional elements that influence the individual's temperature experience. Be mindful that being in direct sunlight might mean feeling hotter, with the heat index rising by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to children. Children often overlook the need for breaks and fluid intake. Thirst is a late-stage sign of dehydration - hence, it is necessary to stay hydrated, especially during extended periods of physical activities.
Evaporating sweat, thanks to perspiration, acts as a natural air conditioner for the human body. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. Rising body temperatures due to excess heat retention could signify impending heat disorders.

Humidity

In Teresina, the average relative humidity in January is 78%.

Rainfall

In Teresina, during January, the rain falls for 28.3 days and regularly aggregates up to 235mm (9.25") of precipitation. Throughout the year, there are 207.4 rainfall days, and 1348mm (53.07") of precipitation is accumulated.

Daylight

The average length of the day in January is 12h and 23min.
On the first day of the month, sunrise is at 05:42 and sunset at 18:07. On the last day of January, sunrise is at 05:54 and sunset at 18:14 -03.

Sunshine

The average sunshine in January is 8.9h.

UV index

January, March through December, with an average maximum UV index of 7, are months with the highest UV index in Teresina. A UV Index of 6 to 7 symbolizes a high health risk from unprotected exposure to Sun's UV rays for average individuals.
Note: In January, an average UV index of 7 transforms into the following instructions:
Persist in precautions and follow sun safety policies. Keeping sunburn at bay is imperative. Avoid exposure to the Sun and try to stay in the shade between 10 a.m. and 4 p.m., when UV radiation is most potent, but be aware that parasols or canopies may not offer full protection. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades.