December weather forecast
Manaus, Brazil

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

Weather in December

December rounds out the year with weather trends consistent with those observed in November. High temperatures prevail at 31.3°C (88.3°F) and heavy showers are characteristic of the tropical wet season. Even though December has fewer daylight hours, it possesses a unique charm. With prolonged rainfall, the Amazon Rainforest becomes a vibrant ecosystem teeming with life, a spectacle to behold for visitors and nature lovers alike.

Temperature

With the onset of December, the average high-temperature registers at a still tropical 31.3°C (88.3°F), subtly different from November's 32.1°C (89.8°F). In Manaus, an average nighttime temperature of 23.5°C (74.3°F) is expected during December.

Heat index

December's heat index is calculated to be a blistering 44°C (111.2°F). Watchful: Heat cramps and heat exhaustion are predicted. Continued exertion could lead to heatstroke.
Be aware that heat index ratings are designed for shaded locations and minor breezes. Under direct sunshine, the heat index values might be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. The impact of temperature is individual, as people's perception of weather may change based on their body mass, height, and physical activity. Do note, being directly under sun rays can amplify the heat you feel, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Young children are more at risk than adults since they tend to sweat less. Moreover, their large skin surface in proportion to their small bodies and the high heat production due to their activities contribute to their vulnerability.
In the face of high temperatures, the human body's reflex is to perspire, leveraging sweat evaporation for cooling. With higher relative humidity, the rate of evaporation is reduced, resulting in increased heat retention in the body compared to drier air. When body temperature rises due to excess heat gain beyond its removal capability, one might experience heat-related disorders.

Humidity

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

Rainfall

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

Daylight

With an average of 12h and 18min of daylight, December has the longest days of the year.
On the first day of December in Manaus, Brazil, sunrise is at 05:40 and sunset at 17:58. On the last day of the month, sunrise is at 05:54 and sunset at 18:12 -04.

Sunshine

In December, the average sunshine in Manaus 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. A UV Index reading of 11, and higher, represents an excessive health risk from exposure to the Sun's UV rays for the average person.
Note: The maximum UV index of 12 during December translates into these guidelines:
Put into effect every precaution of importance, unprotected skin and eyes may get burns swiftly. Limit direct sun exposure and seek shade between 10 a.m. and 4 p.m., the time of the most intense UV radiation, noting that shade structures may not provide total sun protection. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck. Regularly apply and reapply a broad-spectrum sunscreen with a minimum SPF 30 every two hours, or straight after swimming or an outdoor activity.
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Frequently asked questions

Is it hot in Manaus during December?

Manaus in December has an average high-temperature of 31.3°C (88.3°F) and an average low-temperature of 23.5°C (74.3°F). The average heat index (a.k.a. 'felt air temperature', 'feels like'), which combines air temperature and relative humidity, in December is calculated to be 44°C (111.2°F).

What is the average humidity in December in Manaus?

The average relative humidity in December in Manaus, Brazil, is 85%.

How much does it rain in Manaus in December?

In December, in Manaus, the rain falls for 16 days. Throughout December, 220mm (8.66") of precipitation is accumulated.

When are the longest days in Manaus?

The month with the longest days in Manaus is December, with an average of 12h and 18min of daylight.

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

In December, the average day length in Manaus, Brazil, is 12h and 18min.

When is the sunrise / sunset in December in Manaus?

On the first day of December in Manaus, sunrise is at 05:40 and sunset at 17:58. On the last day of the month, sunrise is at 05:54 and sunset at 18:12 -04.

How long on average sun shines in December in Manaus?

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

What are the months with the highest UV index in Manaus?

The months with the highest UV index in Manaus 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, Brazil, is 12. A UV Index estimate of 11, and higher, represents an ultimate hazard to health from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average daylight
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 2min

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 54min).

  • Average sunshine in December: 4h and 1min

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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Manaus, Brazil

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