Manaus
Brazil
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Manaus, Brazil

Cloudy skies above the Amazon Theatre building in Manaus, Brazil
Cloudy skies above the Amazon Theatre building in Manaus, Brazil
The first month of the summer, December, is still a hot month in Manaus, Brazil, with temperature in the range of an average high of 31.3°C (88.3°F) and an average low of 23.5°C (74.3°F).

Temperature

In Manaus, the average high-temperature is almost the same as in November - a still tropical 31.3°C (88.3°F). In Manaus, the average low-temperature is 23.5°C (74.3°F).

Heat index

The average heat index is evaluated at a scorching 43.8°C (110.8°F). Be wary - heat exhaustion and heat cramps are highly anticipated. With continued activity, heatstroke is very likely.
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 'apparent temperature', 'real feel', 'felt air temperature', or 'feels like', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. Additional factors like activity, wind, metabolic differences, and clothing affect individual temperature impact. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. With a lot of moisture in the air, the evaporation process is not as effective, and the body does not cool down as efficiently, creating a perception of overheating. 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

The average relative humidity in Manaus is 85%.

Rainfall

In Manaus, it is raining for 16 days, with typically 219.6mm (8.6") of accumulated precipitation. Throughout the year, in Manaus, there are 160 rainfall days, and 2307.3mm (90.8") of precipitation is accumulated.

Daylight

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

Sunshine

In December, the average sunshine is 4.2h.

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. 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: The daily maximum UV index of 12 interpret into the following advice:
Take all required precautions, as unprotected skin and eyes can burn in minutes. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Even on cloudy days, a sunscreen with a minimum 30 sun protection factor should be generously applied and frequently re-applied, including after every swim or outdoor exercise.

What is the temperature in December in Manaus?

In December, in Manaus, Brazil, the average high-temperature is 31.3°C (88.3°F), and the average low-temperature is 23.5°C (74.3°F). The average heat index (a.k.a. 'felt air temperature', 'real feel'), that combines relative humidity and air temperature, in December is calculated to 43.8°C (110.8°F).

What is the average humidity in December in Manaus?

In Manaus, the average relative humidity in December is 85%.

How many days does it rain in December in Manaus?

In Manaus, in December, during 16 rainfall days, 219.6mm (8.6") of precipitation is typically accumulated.

When are the longest days in Manaus?

Months with the longest days in Manaus, Brazil, are January, November and December, with an average of 12.3h of daylight.

What is the average length of the day in December in Manaus?

In Manaus, the average length of the day in December is 12.3h.

How long on average sun shines in December in Manaus?

The average sunshine in December is 4.2h.

When is the highest UV index in Manaus?

January through May, August through December, with an average maximum UV index of 12, are months with the highest UV index in Manaus, Brazil.

What is the UV index intensity in December in Manaus?

The average daily maximum UV index in December in Manaus, Brazil, is 12. A UV Index estimate of 11, and higher, represents an ultimate hazard to health from unprotected exposure to the UV radiation.
Average temperature in December - Manaus, Brazil
  • Average high temperature in December: 31.3°C

The warmest month (with the highest average high temperature) is September (32.9°C).
The month with the lowest average high temperature is February (30.4°C).

  • Average low temperature in December: 23.5°C

Months with the highest average low temperature are October and November (23.7°C).
The coldest month (with the lowest average low temperature) is July (22.7°C).

Average humidity in December - Manaus, Brazil
  • Average humidity in December: 85%

The month with the highest relative humidity is March (88%).
Months with the lowest relative humidity are August and September (77%).

Average rainfall in December - Manaus, Brazil
  • Average rainfall in December: 219.6mm

The wettest month (with the highest rainfall) is March (335.4mm).
The driest month (with the lowest rainfall) is August (47.3mm).

Average rainfall days in December - Manaus, Brazil
  • Average rainfall days in December: 16 days

The month with the highest number of rainy days is March (20 days).
Months with the lowest number of rainy days are August and September (6 days).

Average daylight in December / Average sunshine in December - Manaus, Brazil
  • Average daylight in December: 12.3h

Months with the longest days are January, November and December (Average daylight: 12.3h).
The month with shortest days is June (Average daylight: 11.9h).

  • Average sunshine in December: 4.2h

The month with most sunshine is August (Average sunshine: 7.3h).
The month with least sunshine is February (Average sunshine: 3.1h).

Average UV index in December - Manaus, Brazil
  • Average UV index in December: 12

Months with the highest UV index are January, February, March, April, May, August, September, October, November and December (UV index 12).
The month with the lowest UV index is July (UV index 10).