December weather forecast
Manaus, Brazil

Cloudy skies above the Amazon Theatre building in Manaus, Brazil
Cloudy skies above the Amazon Theatre building in Manaus, Brazil

Weather in December

December, the first month of the summer in Manaus, is still a tropical month, with an average temperature fluctuating between 31.3°C (88.3°F) and 23.5°C (74.3°F).

Temperature

In December, the average high-temperature is practically 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

In December, the average heat index is appraised at a blistering 44°C (111.2°F). Beware: Heat cramps and heat exhaustion are very likely. Heatstroke is imminent with prolonged activity.
Take into consideration that the heat index values are calculated for shade and light wind conditions. 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', 'feels like', 'apparent temperature', or 'real feel', is a measure of how hot it feels when the actual air humidity is factored in. This effect is individual, with diverse people perceiving weather differently for numerous reasons (metabolic differences, differences in body mass, height, and shape, clothing), and activity. 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.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. If the body can not disperse the excessive heat and body temperature reaches conditions of hyperthermia, above 37.5°C (99.5°F) to 38.3°C (100.9°F), thermal conditions are potentially life-threatening.

Humidity

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

Rainfall

In Manaus, during December, the rain falls for 16 days and regularly aggregates up to 220mm (8.66") of precipitation. In Manaus, during the entire year, the rain falls for 160 days and collects up to 2307mm (90.83") of precipitation.

Daylight

December has the longest days of the year, with an average of 12h and 18min of daylight.
On the first day of the month, sunrise is at 05:40 and sunset at 17:57. On the last day of December, sunrise is at 05:54 and sunset at 18:12 -04.

Sunshine

The average sunshine in December in Manaus, Brazil, 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 estimate of 11, and higher, represents an extreme health hazard from unsafe exposure to UV radiation for the average person.
Note: The daily maximum UV index of 12 in December interpret into the following advice:
Take all required precautions, as unprotected skin and eyes can burn in minutes. 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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. 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.
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FAQ

What is the temperature in December in Manaus?

In Manaus, Brazil, in December, 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. 'apparent temperature', 'felt air temperature'), which represents the influence of relative humidity on air temperature, in December is appraised at 44°C (111.2°F).

What is the average humidity in December in Manaus?

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

How much does it rain in Manaus in December?

In Manaus, Brazil, in December, it is raining for 16 days, with typically 220mm (8.66") of accumulated precipitation.

When are the longest days in Manaus?

December has the longest days of the year, with an average of 12h and 18min of daylight.

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

The average day length in December in Manaus is 12h and 18min.

When is the sunrise / sunset in December in Manaus?

In December, on the first day of the month, sunrise is at 05:40 and sunset at 17:57. On the last day of the month, sunrise is at 05:54 and sunset at 18:12 -04.

How many hours of sunshine does Manaus have in December?

In December, the average sunshine duration in Manaus, Brazil, is 4.2h.

When is the highest UV index in Manaus?

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

How high is the UV index in December in Manaus?

In December, the average daily maximum UV index in Manaus is 12. A UV Index of 11, and more, symbolizes an extreme health threat from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average sunshine
Average UV index

Average temperature in December
Manaus, Brazil

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

The 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).

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Average humidity in December
Manaus, Brazil

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

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

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Average rainfall in December
Manaus, Brazil

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 least rainfall) is August (47.3mm).

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Average rainfall days in December
Manaus, Brazil

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).
The months with the least rainy days are August and September (6 days).

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Average daylight in December /
Average sunshine in December
Manaus, Brazil

Average daylight in December / Average sunshine in December - Manaus, Brazil
  • Average daylight in December: 12h and 18min

The month with the longest days is December (Average daylight: 12h and 18min).
The month with the shortest days is June (Average daylight: 11h and 57min).

  • Average sunshine in December: 4h and 12min

The month with the most sunshine is August (Average sunshine: 7h and 18min).
The month with the least sunshine is February (Average sunshine: 3h and 6min).

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Average UV index in December
Manaus, Brazil

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

The 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).

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