Last updated: August 21, 2025
December in Porto Alegre, Brazil offers a warm and vibrant atmosphere, with temperatures reaching a maximum of 38°C (101°F) and an average of 24°C (76°F). Nighttime provides a more comfortable respite, dropping to a minimum of 13°C (55°F). Visitors can expect a fair amount of moisture, with 80 mm (3.2 in) of precipitation occurring over approximately 8 days, resulting in a remarkable humidity level of 84%. This combination of heat and humidity creates a tropical feel, making December a lively time to explore the city's rich culture and stunning landscapes.
In December, Porto Alegre basks in a warm embrace, with temperatures reflecting the peak of the summer season. Minimums hover around 13°C (55°F), offering a comfortable start to the day, while the average temperature reaches a balmy 24°C (76°F). As the sun climbs higher, the city can sizzle with maximums soaring to 38°C (101°F), making it one of the hottest months of the year. This trend showcases a gradual increase in warmth as December follows the cooler temperatures of November, setting the stage for vibrant summer activities and lively outdoor events. Whether you're seeking leisurely strolls in the park or evenings by the waterfront, the warmth of Porto Alegre in December invites you to fully embrace the joyous spirit of summer.
In December, Porto Alegre experiences a relatively mild conclusion to its wet season, characterized by 80 mm (3.2 in) of precipitation spread across 8 days. This marks a decrease from the substantial rainfall seen in November and earlier months like September, which boasts an average of 155 mm (6.1 in) over 12 days. The city’s precipitation pattern in December indicates the transition to drier conditions, setting the stage for the summer months ahead. While rainfall decreases, the climate remains humid, contributing to a lush landscape, a hallmark of Porto Alegre during this time of year. Overall, December serves as a bridge between the wetter period and the approaching summer heat.
In December, Porto Alegre experiences a humidity level of 84%, which reflects a slight decrease compared to the higher averages seen in the preceding months. As the year winds down, the humidity levels remain noticeably elevated, particularly when compared to the drier winter months. From May onwards, there's a distinct trend of increasing humidity, peaking at 87% in May before gradually stabilizing around the low to mid-80s. This pattern highlights a perennial characteristic of Porto Alegre's climate: a warm and humid atmosphere that persists even as the festive season approaches. As the city enjoys its summer, residents and visitors can expect a refreshing ambiance, albeit accompanied by a touch of humidity.
In December, Porto Alegre experiences one of its peak UV Index levels at 14, categorizing exposure as extreme with a rapid burn time of just 10 minutes. This trend mirrors the previous months of January and February, which also recorded a UV Index of 14 and 13 respectively, indicating a consistent pattern of high sun exposure during the summer months. Following a slight decline in April and May, where the UV Index dropped to 9 and 6, the index rises again as the year concludes. The data underscores the importance of sun protection during this period, as the risk of harm from UV radiation is significantly heightened. For more detailed information, check out Porto Alegre UV Index.
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December shines brightly in Porto Alegre, Brazil, as it boasts an impressive 361 hours of sunshine, marking the peak of the city's sunny season. This month's sun-drenched days significantly outshine those of the preceding months, revealing a clear trend of increasing sunlight as the year progresses. As summer approaches, the transition from November's 316 hours to December's warmth not only fosters a lively outdoor culture but also encourages residents and visitors alike to revel in the balmy weather. With a noticeable drop in sunshine during the winter months, December’s radiant brilliance serves as a beautiful prelude to the hot summer days that lie ahead, creating an inviting atmosphere that beckons everyone to enjoy the vibrant coastal city.
In December, Porto Alegre enjoys a 57% chance of sunny weather, marking a peak in optimism as the year winds down. This likelihood is one of the highest in the latter part of the year, illustrating a clear trend of increasing sunshine compared to the preceding months. As summer approaches, the consistent rise from a low of 32% in June to December's 57% creates an inviting atmosphere for outdoor activities and festivities. With each passing month, the chance of sun climbs, particularly notable in the jump from 52% in November to December's warmer embrace of the sun, setting the stage for a vibrant start to the summer season.
In December, Porto Alegre basks in an impressive 14 hours of daylight, marking the peak of summer and illuminating the city in vibrant energy. This extended sunlight follows a gradual increase from 11 hours in April, as the city transitions through the year, with daylight gradually diminishing from 13 hours in January and February to a mid-year minimum of 10 hours from May to July. As spring settles in, daylight begins to regain its dominance, reaching 12 hours in October and blossoming into the long, sunlit days of late spring and early summer. December's abundant light not only brightens the skyline but also invites locals and visitors alike to revel in outdoor activities and enjoy the warm embrace of the season.
As December approaches in Porto Alegre, Brazil, the city welcomes a refreshing uptick in winds, with average speeds reaching 3.7 m/s (8 mph). This marks a distinct peak in the seasonal trends, following a gradual increase from the earlier months of the year. Starting from January's gentle breezes at 3.1 m/s, the winds maintain a relatively stable tempo throughout the spring and into the early summer, showing minor fluctuations. However, December's brisk gusts signify a shift as residents and visitors alike feel the invigorating energy in the air. This wind pattern not only enhances the festive ambiance but also hints at the dynamic weather changes that characterize the summer months ahead.
Weather in Porto Alegre varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Porto Alegre, focusing on differences in temperature, rainfall, humidity, and UV levels.
In December, the weather in Porto Alegre features a minimum temperature of 13°C (55°F) and an average of 24°C (76°F), with highs reaching up to 38°C (101°F). This month experiences about 80 mm (3.2 in) of precipitation over 8 days, accompanied by relatively high humidity at 84%. In contrast, January sees slightly warmer conditions, with minimum temperatures of 15°C (58°F), an average of 26°C (79°F), and maximums peaking at 39°C (103°F). Precipitation increases to 93 mm (3.7 in) over 12 days, though humidity decreases to 77%. For a detailed overview, visit Porto Alegre weather in January.
In December, temperatures in Porto Alegre range from a minimum of 13°C (55°F) to a maximum of 38°C (101°F), with an average temperature of 24°C (76°F). The month experiences around 80 mm (3.2 in) of precipitation over approximately 8 days, coupled with a high humidity level of 84%.
In contrast, February sees slightly higher temperatures, with a minimum of 14°C (58°F) and an average of 25°C (77°F), while still reaching a maximum of 38°C (100°F). However, February is wetter, receiving about 112 mm (4.4 in) of rainfall over 11 days, with humidity levels dropping to 79%. For more detailed insights, check out Porto Alegre weather in February.
In December, temperatures in Porto Alegre range from a minimum of 13°C (55°F) to a maximum of 38°C (101°F), with an average temperature of 24°C (76°F). The month experiences about 80 mm of precipitation over 8 days and maintains a high humidity level of 84%. In contrast, March sees a similar minimum temperature of 13°C (56°F) and a slightly lower average of 23°C (75°F), while still reaching up to 38°C (100°F) at its peak. However, March is wetter, recording 109 mm of rainfall over 12 days, with a slightly lower humidity of 79%. For more detailed information, you can view the Porto Alegre weather in March.
In December, the weather is significantly warmer, with average temperatures reaching 24°C (76°F) and highs peaking at 38°C (101°F). The humidity is notably high at 84%, contributing to a sultry atmosphere. Precipitation is relatively frequent, with rain expected on 8 days, accumulating to about 80 mm (3.2 inches).
In contrast, April experiences cooler temperatures, with an average of 21°C (71°F) and maximums of 34°C (93°F). The humidity slightly decreases to 82%, while rainfall is comparable, totaling around 73 mm (2.9 inches) across 8 rainy days. For more details, check out this link: Porto Alegre weather in April.
December and May exhibit distinct weather patterns in Porto Alegre. In December, temperatures range from a minimum of 13°C (55°F) to a maximum of 38°C (101°F), with an average of 24°C (76°F). The month sees relatively lower precipitation, totaling 80 mm (3.2 in) over about 8 days, along with high humidity at 84%. In contrast, May experiences cooler temperatures with a minimum of 5°C (41°F), an average of 17°C (63°F), and a maximum of 32°C (90°F). However, May is wetter, with 153 mm (6.0 in) of precipitation over 10 days and slightly higher humidity at 87%. For more detailed insights, check out Porto Alegre weather in May.
December in Porto Alegre is characterized by warm temperatures, with a minimum of 13°C (55°F) and a maximum reaching up to 38°C (101°F), making it significantly hotter compared to June. The average temperature during this summer month is around 24°C (76°F), accompanied by high humidity at 84%. Precipitation is relatively moderate with about 80 mm (3.2 in) over 8 days.
In contrast, June introduces cooler conditions, experiencing a minimum temperature of 3°C (38°F) and a maximum of 31°C (88°F). The average temperature drops to 16°C (60°F), with a slight increase in rainfall to 113 mm (4.4 in) over 9 days, and humidity remains quite high at 85%. For a more detailed look at Porto Alegre's weather during this month, check out Porto Alegre weather in June.
In December, the weather features much warmer temperatures, with a minimum of 13°C (55°F) and an average high of 38°C (101°F), while July experiences cooler conditions with temperatures ranging from a chilly 2°C (35°F) to a maximum of 30°C (87°F). Precipitation is less frequent in December, totaling 80 mm (3.2 in) over about 8 days, compared to July, which sees a higher accumulation of 122 mm (4.8 in) over the same number of days. Humidity levels remain high in both months, at 84% in December and 82% in July. For more detailed insights, you can check Porto Alegre weather in July.
December weather is characterized by significantly higher temperatures, with a minimum of 13°C (55°F) and an average of 24°C (76°F), reaching a maximum of 38°C (101°F). In contrast, August experiences cooler conditions, marked by a minimum of 3°C (38°F) and an average of 16°C (61°F), with a maximum of 34°C (94°F). While both months receive similar levels of precipitation, with December at 80 mm (3.2 in) and August at 70 mm (2.8 in), the humidity remains high in both, slightly more so in December at 84% compared to 81% in August. For more details on August weather, you can check Porto Alegre weather in August.
When comparing the weather in December and September, notable differences emerge in temperature and precipitation. December tends to be warmer, with average temperatures ranging from a mild 24°C (76°F) to a scorching 38°C (101°F), while September sees cooler temperatures, averaging 18°C (65°F) with a minimum of 7°C (45°F). In terms of precipitation, September experiences higher rainfall, accumulating 155 mm (6.1 in) over 12 days, compared to December's 80 mm (3.2 in) over 8 days. Interestingly, both months share the same humidity level of 84%, creating a consistently muggy atmosphere. For more specifics, you can check out Porto Alegre weather in September.
In comparing the weather of December and October, December tends to be warmer, with average temperatures ranging from a minimum of 13°C (55°F) to a maximum of 38°C (101°F), while October sees lower averages, with minimum temperatures of 9°C (49°F) and a maximum of 37°C (100°F). Precipitation is notably higher in October, totaling 139 mm (5.5 in) over 13 days, compared to December's 80 mm (3.2 in) over 8 days, indicating a wetter month. Additionally, humidity remains relatively high in both months, with December hovering around 84% and October at 85%. For more details on October weather specifics, you can check Porto Alegre weather in October.
December tends to be slightly warmer than November, with average temperatures rising from 22°C (72°F) in November to 24°C (76°F) in December. The maximum temperatures also see a slight increase, peaking at 38°C (101°F) in December compared to 37°C (99°F) in November. However, December experiences less rainfall, with 80 mm (3.2 in) over 8 days, whereas November has a higher precipitation level of 112 mm (4.4 in) across 10 days. Humidity remains comparable, at 84% in December and 82% in November. For a closer look at November's weather, you can visit Porto Alegre weather in November.
As December arrives in Porto Alegre, the city experiences a notable shift in weather, characterized by higher temperatures and a palpable increase in humidity. With maximums soaring up to 38°C, the warmth invites outdoor activities, while the average of 24°C makes for pleasantly warm evenings. However, the month also brings its share of rainy days, with approximately 80 mm of precipitation across 8 days, providing a refreshing contrast to the heat. This unique blend of warmth and moisture sets December apart from the cooler months, offering a vibrant ambiance perfect for holiday festivities. For more detailed insights, visit Porto Alegre Climate.