January weather forecast
Santarém, Brazil

January, the same as December, in Santarém, Brazil, is another tropical summer month, with temperature in the range of an average high of 30.6°C (87.1°F) and an average low of 24°C (75.2°F).

Temperature

At the onset of January, Santarém records an average high-temperature of a still tropical 30.6°C (87.1°F), showing little deviation from the preceding month. Throughout January, the nighttime temperature in Santarém averages to a moderately hot 24°C (75.2°F).

Heat index

January's heat index is evaluated at a very hot 39°C (102.2°F). Implement enhanced safety actions, heat cramps and heat exhaustion could occur. Sustained activity might result in heatstroke.
Note that heat index values are valued for light wind and location in the shade. The heat index could see an increase by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. The impact of weather is personal, differing among a variety of people based on differences in body mass, height, and the level of physical exertion. It is important to note that direct sunlight can intensify the weather impact, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values remain especially vital for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it's vital to remain hydrated, particularly during prolonged physical activities.
By perspiring, the human body can shed its excessive warmth since evaporated sweat cools it off. Heightened relative humidity interferes with the body's usual cooling mechanism by reducing evaporation, subsequently decreasing the body's cooling rate and increasing the sensation of heat. If the body retains more heat than it can expel, the increasing temperature can lead to heat-related conditions.

Humidity

The average relative humidity in January in Santarém is 79%.

Rainfall

In Santarém, in January, it is raining for 27.4 days, with typically 256mm (10.08") of accumulated precipitation. In Santarém, during the entire year, the rain falls for 259.2 days and collects up to 2234mm (87.95") of precipitation.

Daylight

In Santarém, the average length of the day in January is 12h and 14min.
On the first day of January, sunrise is at 06:34 and sunset at 18:50. On the last day of the month, sunrise is at 06:45 and sunset at 18:58 -03.

Sunshine

In Santarém, the average sunshine in January is 7.6h.

UV index

The months with the highest UV index in Santarém are January, April through December, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation for ordinary individuals.
Note: The maximum daily UV index of 7 in January interprets into the following recommendations:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. Be aware that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. and try to reduce direct sun exposure during this period as much as possible. Stay sun-safe with clothing that is both closely woven and worn loosely.