Weather in South America for December 2025
In general, the average temperature in South America at the beginning of December is 28.3 °C. As the month progressed, temperatures tended to slightly decrease, reaching an average of 28.1 °C by the end of December.
South America experiences heavy rainfall in December, with over 20 rainy days and an average total precipitation 148.7 mm.
Temperatures
Rain 🌧️
South America Weather December
| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  27° | 2 31° | 3 27° | 4 26° | 5 26° | 6 30° | 7 31° |
| 8 30° | 9 26° | 10 25° | 11 24° | 12 25° | 13  26° | 14  27° |
| 15 31° | 16 31° | 17 28° | 18 28° | 19 27° | 20 30° | 21 28° |
| 22  27° | 23 27° | 24 27° | 25 29° | 26 30° | 27  27° | 28 29° |
| 29 29° | 30 27° | 31 26° |
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Temperatures trend during December in South America
December weather day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Dec. | Patchy rain possible | 27° /23° | 0.1 mm | 8 | |
| 2 Dec. | Patchy rain possible | 31° /22° | 1.8 mm | 9 | |
| 3 Dec. | Patchy rain possible | 27° /23° | 7.1 mm | 8 | |
| 4 Dec. | Light rain shower | 26° /22° | 33.2 mm | 7 | |
| 5 Dec. | Light rain shower | 26° /22° | 10.3 mm | 8 | |
| 6 Dec. | Patchy rain possible | 30° /23° | 0.9 mm | 9 | |
| 7 Dec. | Patchy rain possible | 31° /23° | 0.8 mm | 9 | |
| 8 Dec. | Patchy rain possible | 30° /23° | 1.7 mm | 8 | |
| 9 Dec. | Light rain shower | 26° /22° | 4.5 mm | 7 | |
| 10 Dec. | Patchy rain possible | 25° /21° | 6.3 mm | 7 | |
| 11 Dec. | Light rain shower | 24° /21° | 8.4 mm | 7 | |
| 12 Dec. | Patchy rain possible | 25° /21° | 1.2 mm | 7 | |
| 13 Dec. | Partly cloudy | 26° /20° | 0 mm | 8 | |
| 14 Dec. | Sunny | 27° /21° | 3.7 mm | 8 | |
| 15 Dec. | Sunny | 31° /22° | 0.3 mm | 9 | |
| 16 Dec. | Partly cloudy | 31° /23° | 5.3 mm | 9 | |
| 17 Dec. | Sunny | 28° /22° | 1.8 mm | 9 | |
| 18 Dec. | Sunny | 28° /22° | 1.2 mm | 8 | |
| 19 Dec. | Patchy rain possible | 27° /21° | 0.1 mm | 8 | |
| 20 Dec. | Patchy rain possible | 30° /22° | 10.6 mm | 9 | |
| 21 Dec. | Patchy rain possible | 28° /22° | 4.1 mm | 8 | |
| 22 Dec. | Heavy rain at times | 27° /21° | 4.1 mm | 7 | |
| 23 Dec. | Patchy rain possible | 27° /21° | 4.6 mm | 7 | |
| 24 Dec. | Patchy rain possible | 27° /22° | 2.9 mm | 7 | |
| 25 Dec. | Patchy rain possible | 29° /22° | 1.2 mm | 8 | |
| 26 Dec. | Light rain shower | 30° /23° | 3 mm | 8 | |
| 27 Dec. | Moderate or heavy rain shower | 27° /22° | 8.1 mm | 7 | |
| 28 Dec. | Patchy rain possible | 29° /22° | 3.1 mm | 7 | |
| 29 Dec. | Moderate or heavy rain shower | 29° /22° | 5.3 mm | 8 | |
| 30 Dec. | Moderate or heavy rain shower | 27° /22° | 9.7 mm | 7 | |
| 31 Dec. | Light rain shower | 26° /21° | 3.5 mm | 7 | |
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Guide for South America in December
In December, Rio de Janeiro experiences warm and pleasant weather, making it an ideal destination for travelers seeking a tropical climate. At the beginning of the month, Rio de Janeiro typically enjoys temperatures around 28°, with occasional showers and high humidity.
The city is characterized by its lush greenery and vibrant atmosphere, and visitors can expect to enjoy outdoor activities and beach days during this time.
As the month progresses, the weather in Rio de Janeiro remains consistently warm, with temperatures hovering around 30°. The city experiences longer daylight hours, providing ample opportunities for sightseeing and exploring the iconic landmarks such as Christ the Redeemer and Sugarloaf Mountain.
The coastal breeze offers relief from the heat, creating a comfortable environment for outdoor excursions and beachside relaxation.
Overall, December in Rio de Janeiro offers a delightful blend of warm temperatures, occasional showers, and a lively ambiance, making it an enticing destination for holidaymakers and sun-seekers.
Whether strolling along the famous Copacabana beach or indulging in the city's vibrant nightlife, visitors can revel in the favorable weather conditions that Rio de Janeiro has to offer during this time of year.
Have you visited South America in December? Share your experience by writing a review.
South America in December - FAQ
December rainfall patterns in South America
UV exposure in South America during December
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Where is South America?Get accurate weather forecasts for South America, located at latitude -22.906 and longitude -43.182. Stay updated with localized weather information tailored for South America.