January weather forecast and climate
Manaus, Brazil

January, the same as December, in Manaus, Brazil, is another tropical summer month, with average temperature varying between 23.1°C (73.6°F) and 30.5°C (86.9°F).

Temperature

In Manaus, the average high-temperature is almost the same as in December - a still hot 30.5°C (86.9°F). In January, in Manaus, Brazil, the average low-temperature is 23.1°C (73.6°F).

Heat index

In January, the average heat index is estimated at an extremely hot 41.2°C (106.2°F). Beware - heat cramps and heat exhaustion are very likely. Heatstroke is imminent with prolonged activity.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'real feel', 'apparent temperature', or 'feels like', combines air temperature and relative humidity to represent a human perceived temperature equivalent. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (metabolic differences, wind, clothing). Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. High relative humidity reduces the evaporation rate, resulting in a lower heat removal rate from the body, causing the perception of being overheated. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

In Manaus, the average relative humidity in January is 86%.

Rainfall

In Manaus, it is raining for 19 days, with typically 264.2mm (10.4") of accumulated precipitation. In Manaus, during the entire year, the rain falls for 160 days and collects up to 2307.3mm (90.8") of precipitation.

Daylight

January, November and December, with an average of 12.3h of daylight, are months with the longest days.

Sunshine

The average sunshine in January is 3.7h.

UV index

January through May, August through December, with an average maximum UV index of 12, are months with the highest UV index in Manaus, Brazil. A UV Index value of 11, and more, symbolizes an ultimate health vulnerability from unsafe exposure to the UV radiation for the ordinary person.
Note: In January, the average maximum UV index of 12 translate into the following recommendations:
Practice all essential precautions. Protection against sun damage is crucial. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. A broad-spectrum sunscreen of SPF 30+ should be liberally applied and re-applied every two hours, and immediately after an outdoor workout or a swim.