December weather forecast
Porto Alegre, Brazil

Weather in December

The first month of the summer, December, is still a warm month in Porto Alegre, Brazil, with an average temperature varying between 19°C (66.2°F) and 29.8°C (85.6°F).

Temperature

In December, the average high-temperature is practically the same as in November - a still warm 29.8°C (85.6°F). In Porto Alegre, Brazil, the average low-temperature is 19°C (66.2°F).

Heat index

The average heat index in December is calculated to be a very hot 35°C (95°F). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy 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 what the temperature feels like to the human body when the air temperature is combined with the relative humidity. Additional factors like metabolic differences, pregnancy, differences in body mass, height, and shape, and activity influence one's weather impression. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index 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. When the relative humidity is high, the evaporation rate is reduced. The warmth is removed from the body at a lower rate, causing the body to retain more heat than it would in dry air. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

The least humid month is December, with an average relative humidity of 71%.

Rainfall

In Porto Alegre, in December, during 13.7 rainfall days, 60mm (2.36") of precipitation is typically accumulated. In Porto Alegre, during the entire year, the rain falls for 148.3 days and collects up to 805mm (31.69") of precipitation.

Sea temperature

In Porto Alegre, the average seawater temperature in December is 22.7°C (72.9°F).
Note: For individuals prone to feeling cold, swimming in 23°C (73.4°F) is still regarded as intolerable. A wetsuit is not a necessity, but sunshine, wind, and air temperature are essential factors for relishing swimming at 22.7°C (72.9°F).

Daylight

December has the longest days of the year, with an average of 14h and 2min of daylight.
On the first day of December in Porto Alegre, sunrise is at 05:15 and sunset at 19:11. On the last day of the month, sunrise is at 05:26 and sunset at 19:29 -03.

Sunshine

December has the most sunshine of the year, with an average of 8.3h of sunshine.

UV index

The month with the highest UV index is December, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV radiation for ordinary individuals.
Note: In December, the average maximum UV index of 7 translate into the following recommendations:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 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. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.
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FAQ

What is the temperature in December in Porto Alegre?

The average high-temperature, in December, is 29.8°C (85.6°F), while the average low-temperature is 19°C (66.2°F). in December, the average heat index (a.k.a. 'apparent temperature', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, is calculated to be 35°C (95°F).

What is the least humid month in Porto Alegre?

With an average relative humidity of 71%, December is the least humid month.

What is the average humidity in December in Porto Alegre?

The average relative humidity in December in Porto Alegre, Brazil, is 71%.

How much does it rain in Porto Alegre in December?

In December, in Porto Alegre, Brazil, the rain falls for 13.7 days. Throughout December, 60mm (2.36") of precipitation is accumulated.

What is the sea temperature in December in Porto Alegre?

In December, the average sea temperature in Porto Alegre is 22.7°C (72.9°F). Depending on a person's sensitivity to cold, with regards to sunshine, wind, and air temperature, a quick swim in 22.7°C (72.9°F) water may be enjoyable.

When are the longest days in Porto Alegre?

With an average of 14h and 2min of daylight, December has the longest days of the year in Porto Alegre.

What is the average length of the day in December in Porto Alegre?

In December, the average day length in Porto Alegre is 14h and 2min.

When is the sunrise / sunset in December in Porto Alegre?

On the first day of December in Porto Alegre, Brazil, sunrise is at 05:15 and sunset at 19:11. On the last day of the month, sunrise is at 05:26 and sunset at 19:29 -03.

What month has the most sunshine in Porto Alegre?

The month with the most sunshine is December, with an average of 8.3h of sunshine.

How many hours of sunshine does Porto Alegre have in December?

In December, the average sunshine duration in Porto Alegre is 8.3h.

When is the highest UV index in Porto Alegre?

With an average maximum UV index of 7, December is the month with the highest UV index in Porto Alegre, Brazil.

What is the UV index reading in December in Porto Alegre?

The average daily maximum UV index in December in Porto Alegre, Brazil, is 7. A UV Index reading of 6 to 7 represents a high health threat from unsafe exposure to Sun's UV rays.

Average temperature in December
Porto Alegre, Brazil

Average temperature in December - Porto Alegre, Brazil
  • Average high temperature in December: 29.8°C

The warmest month (with the highest average high temperature) is February (30.5°C).
The month with the lowest average high temperature is July (18.8°C).

  • Average low temperature in December: 19°C

The months with the highest average low temperature are January and February (20°C).
The coldest month (with the lowest average low temperature) is July (10.6°C).

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Average pressure in December
Porto Alegre, Brazil

Average pressure in December - Porto Alegre, Brazil
  • Average pressure in December: 1011.4mbar

The month with the highest atmospheric pressure is July (1019.8mbar).
The month with the lowest atmospheric pressure is December (1011.4mbar).

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Average wind speed in December
Porto Alegre, Brazil

Average wind speed in December - Porto Alegre, Brazil
  • Average wind speed in December: 11.9km/h

The windiest month (with the highest average wind speed) is October (12.1km/h).
The calmest month (with the lowest average wind speed) is May (10km/h).

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Average humidity in December
Porto Alegre, Brazil

Average humidity in December - Porto Alegre, Brazil
  • Average humidity in December: 71%

The month with the highest relative humidity is June (81%).
The month with the lowest relative humidity is December (71%).

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Average rainfall in December
Porto Alegre, Brazil

Average rainfall in December - Porto Alegre, Brazil
  • Average rainfall in December: 60mm

The wettest month (with the highest rainfall) is July (103mm).
The driest month (with the least rainfall) is April (36mm).

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Average rainfall days in December
Porto Alegre, Brazil

Average rainfall days in December - Porto Alegre, Brazil
  • Average rainfall days in December: 13.7 days

The month with the highest number of rainy days is October (15 days).
The month with the least rainy days is April (9.8 days).

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Average sea temperature in December
Porto Alegre, Brazil

Average sea temperature in December - Porto Alegre, Brazil
  • Average sea temperature in December: 22.7°C

The best month for swimming (with the highest average sea temperature) is January (24.7°C).
The coldest month (with the lowest average sea temperature) is August (15.8°C).

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Average daylight in December /
Average sunshine in December
Porto Alegre, Brazil

Average daylight in December / Average sunshine in December - Porto Alegre, Brazil
  • Average daylight in December: 14h and 2min

The month with the longest days is December (Average daylight: 14h and 2min).
The month with the shortest days is June (Average daylight: 10h and 14min).

  • Average sunshine in December: 8h and 18min

The month with the most sunshine is December (Average sunshine: 8h and 18min).
The month with the least sunshine is September (Average sunshine: 7h and 0min).

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Average sunshine days in December
Porto Alegre, Brazil

Average sunshine days in December - Porto Alegre, Brazil
  • Average sunshine days in December: 17.2 days

The month with the most sunshine days is May (19.9 days).
The month with the least sunshine days is September (14.4 days).

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Average UV index in December
Porto Alegre, Brazil

Average UV index in December - Porto Alegre, Brazil
  • Average UV index in December: 7

The month with the highest UV index is December (UV index 7).
The months with the lowest UV index are May, June and July (UV index 4).

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Average cloud cover in December
Porto Alegre, Brazil

Average cloud cover in December - Porto Alegre, Brazil
  • Average cloud cover in December: 33

The month with the most cloud cover is September (Cloud cover 41).
The month with the least cloud cover is November (Cloud cover 32).

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Average visibility in December
Porto Alegre, Brazil

Average visibility in December - Porto Alegre, Brazil
  • Average visibility in December: 9km

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).

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