Last updated: August 21, 2025
December in Manaus, Brazil, presents a warm and humid tropical climate, with maximum temperatures reaching 34°C (93°F) and an average hovering around 26°C (79°F). The month is characterized by substantial precipitation, accumulating around 356 mm (14.0 in), spread over 29 days, making it one of the rainiest times of the year. The humidity level remains high at 83%, contributing to the sultry atmosphere that defines this vibrant city. Visitors can expect lush landscapes and vibrant flora, shaped by the almost daily showers typical of this season.
In Manaus, Brazil, December marks a continuation of the warm and humid climate characteristic of the Amazon region. With minimum temperatures consistently around 22°C (72°F), residents and visitors alike can expect pleasant evenings to escape the heat. The average temperature hovers at 26°C (79°F), making it a comfortable month overall. However, the highs can reach up to 34°C (93°F), mirroring the prevailing trend of increasing temperatures as the year draws to a close. Overall, December's weather in Manaus encapsulates the sultry, tropical vibe of the Amazon, providing an invigorating backdrop for those looking to explore this vibrant city.
In Manaus, Brazil, December marks a significant uptick in precipitation, culminating with an impressive 356 mm (14.0 in) of rainfall—one of the highest totals of the year. The month witnesses 29 rainy days, contributing to the lush, vibrant atmosphere that defines the Amazon region. This surge in precipitation follows a gradual decline from the mid-year low in July, which recorded just 87 mm (3.4 in) over 16 days. The trend is clear: as the year concludes, rainfall intensifies, creating a moist, tropical environment that fuels the rich biodiversity and lush landscapes for which Manaus is renowned.
December in Manaus, Brazil, brings a return to higher humidity levels, measuring 83%—a significant uptick from October's low of 32%. This trend reflects the region's characteristic tropical climate, where humidity typically peaks during the rainy season. Following a drier spell in the latter part of the year, November saw a modest rise to 41%, suggesting a buildup in moisture. As we transition from the drier months of August and September, with their remarkably low humidity levels of 56% and 52% respectively, December marks a pronounced shift back toward the lush, humid environment that defines Manaus. This seasonal rhythm, characterized by high humidity throughout the first half of the year, cultivates the verdant landscapes for which the Amazon is renowned.
In December, Manaus, Brazil, experiences a UV Index of 13, categorized as extreme, indicating that even minimal sun exposure can lead to skin damage in just 10 minutes. This month reflects a slight dip from the peak of 16 observed in the earlier months, yet the risk remains significant. The trend shows a consistent struggle against high UV levels from January through March, where the index reaches its highest, followed by a gradual but persistent decline through the latter half of the year. Despite the slight decrease, December’s UV Index still suggests that caution is essential. For those planning to soak up the Amazon sun, it's crucial to remain vigilant about sun protection. To learn more about the UV Index and its implications for your health, visit Manaus UV Index.
UV Risk Categories
December in Manaus, Brazil, welcomes a warm embrace of sunshine with 231 hours of daylight, providing a contrast to the sunniest month of the year, July, which basks in an impressive 327 hours. As the year draws to a close, December experiences a significant drop from the peak sunshine of mid-year, yet it remains brighter than the earlier months. This gradual decline in daylight hours from May's peak of 272 hours showcases Manaus's tropical climate, where long, sun-drenched days are the norm. September and October maintain robust sunshine figures, but December sets the stage for the more subdued days of January and February. Overall, the trend illustrates a vibrant mix of abundant sunshine, inviting locals and travelers alike to revel in the warmth of Manaus’s tropical allure as the festive season approaches.
In December, the likelihood of sunny weather in Manaus, Brazil is notably low, with only an 8% chance of sunshine. This rate reflects a downward trend as the year winds down; after experiencing a peak in the sunniness of August at 42%, the chances significantly decline through the final months. Notably, November sees a slightly higher 14% chance, but by December, the clouds are more likely to dominate the skies. As the year transitions into the rainy season, this lower probability of sun may lead many to explore the vibrant indoor activities and cultural richness that Manaus has to offer.
In Manaus, Brazil, daylight duration remains remarkably consistent throughout most of the year, with 12 hours of daylight from January to April and then again from August to November. However, a subtle shift occurs in the middle of the year; from May to July, daylight dips slightly to 11 hours, marking a minor seasonal variation. December brings a return to the standard 12 hours of daylight, echoing the earlier months. This rhythmic cycle of daylight not only enhances the tropical charm of Manaus but also influences the vibrant lifestyle of its residents, who thrive under the generous sun.
As December settles over Manaus, Brazil, the average wind speed dips slightly to 1.3 m/s (3 mph), mirroring the calmness of the rainy season. This gentle breeze is consistent with the trend observed throughout the latter half of the year, where wind speeds fluctuated only modestly. With July and August witnessing the highest gusts at 1.5 m/s (3 mph) and 1.6 m/s (4 mph), respectively, December feels notably tranquil. The consistent light winds create a serene atmosphere, allowing locals and visitors alike to enjoy the lush, vibrant environment that characterizes this Amazonian metropolis. The subtle shift in breeziness offers a peaceful backdrop as the year winds down, inviting reflection amidst the beauty of the rainforest.
Weather in Manaus varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Manaus, focusing on differences in temperature, rainfall, humidity, and UV levels.
In December, the weather in Manaus features consistent temperatures, with minimums around 22°C (72°F) and maximums reaching 34°C (93°F). The month is marked by high precipitation levels, totaling 356 mm (14.0 in) over 29 days, leading to a humid environment with an average humidity of 83%. In contrast, January maintains similar temperature ranges, with averages still around 26°C (79°F), but experiences less rainfall, with a total of 238 mm (9.4 in) spread over 23 days. Despite the slight dip in precipitation, humidity levels remain steady at 83%. For more detailed insights about Manaus weather, visit Manaus weather in January.
In December, the weather in Manaus experiences slightly higher temperatures, with an average of 26°C (79°F) and maximums reaching up to 34°C (93°F). However, this month also brings significant rainfall, totaling 356 mm (14.0 in) over 29 days, contributing to a high humidity level of 83%. In contrast, February sees a marginally lower maximum temperature of 33°C (92°F) while maintaining the same average temperature of 26°C (79°F). Additionally, February is drier, with only 242 mm (9.5 in) of precipitation over 24 days and lower humidity at 73%. For further details on February weather, check out Manaus weather in February.
In December, the weather in Manaus features warm temperatures with a minimum of 22°C (72°F) and an average of 26°C (79°F), peaking at 34°C (93°F). The month is also characterized by substantial rainfall, receiving approximately 356 mm (14.0 in) over 29 days, accompanied by high humidity levels of 83%. In contrast, March maintains similar temperature ranges, with a minimum of 22°C (72°F), an average of 26°C (80°F), and a maximum of 33°C (93°F). However, March sees slightly reduced precipitation, totaling 349 mm (13.7 in) across 28 days, and lower humidity at 75%. For a detailed overview of Manaus weather during this month, you can check Manaus weather in March.
In comparing the weather of December and April in Manaus, both months exhibit warm temperatures, with a minimum of 22°C (72°F) and an average of 26°C (79°F). December tends to be slightly warmer with a maximum of 34°C (93°F), compared to April's high of 33°C (92°F). Both months experience significant rainfall, with December receiving 356 mm (14.0 in) and April slightly lower at 341 mm (13.4 in), spread over the same number of rainy days—29. Notably, humidity is marginally higher in April at 85%, compared to December's 83%. For a closer look at April's weather specifics, check out Manaus weather in April.
In comparing the weather in December and May, both months share similar temperature ranges, with minimums of 22°C (72°F), average temperatures around 26°C (79°F), and maximums reaching up to 34°C (93°F). However, December experiences slightly more rainfall, totaling 356 mm (14.0 in) compared to May's 316 mm (12.5 in), despite both months having 29 days of precipitation. Furthermore, humidity levels are elevated in May at 90%, compared to December's 83%. For more detailed information on May weather, you can visit Manaus weather in May.
In comparing the weather of December and June, both months feature warm temperatures, with December experiencing a slightly wider range; the minimum temperature stays at 22°C (72°F) while the average temperature is 26°C (79°F), peaking at 34°C (93°F). In contrast, June has a similar minimum at 22°C (72°F) but a marginally higher average of 27°C (80°F) and a maximum of 33°C (91°F). December is notably wetter, with 356 mm (14.0 in) of precipitation over 29 days compared to June's 147 mm (5.8 in) across 22 days. Humidity levels are comparable, with December at 83% and June at 84%. For more details, you can check the Manaus weather in June.
In December, Manaus experiences warm temperatures with a minimum of 22°C (72°F) and a peak at 34°C (93°F). The average temperature is slightly lower at 26°C (79°F), but this month is characterized by high humidity at 83% and substantial rainfall, with 356 mm (14.0 in) spread across 29 days. In contrast, July features a slightly cooler temperature range, with a minimum of 21°C (70°F) and an average of 27°C (81°F), while still reaching the same maximum of 34°C (93°F). However, July is significantly drier, receiving only 87 mm (3.4 in) of rain over 16 days and lower humidity at 71%. For further details, you can explore the Manaus weather in July.
When comparing the weather in December and August, it’s evident that August is generally warmer and drier. In December, temperatures range from a minimum of 22°C (72°F) to a maximum of 34°C (93°F), with an average temperature of 26°C (79°F). This month also experiences significant rainfall, with 356 mm (14.0 in) over 29 days and high humidity levels at 83%. In contrast, August sees slightly higher average temperatures, reaching an average of 28°C (82°F) and a maximum of 36°C (98°F), but it is much drier, with only 59 mm (2.3 in) of precipitation spread over just 13 days and a lower humidity of 56%. For more detailed information, check out Manaus weather in August.
The weather in December and September contrasts notably in both temperature and precipitation. In September, temperatures range from a minimum of 22°C (73°F) to a maximum of 36°C (98°F), with an average of 28°C (83°F). In contrast, December sees slightly cooler average temperatures, peaking at 34°C (93°F), but with consistently warm minimums of 22°C (72°F).
Precipitation levels also differ significantly; December experiences a much wetter season with 356 mm (14.0 in) of rain over 29 days, while September is drier, receiving only 116 mm (4.6 in) across 17 days. Additionally, humidity is notably higher in December at 83%, compared to 52% in September. For a detailed overview, you can check Manaus weather in September.
In December, the weather tends to be warmer and more humid compared to October, with average temperatures ranging from a minimum of 22°C (72°F) to a maximum of 34°C (93°F). This month also experiences significantly higher precipitation, with 356 mm (14.0 in) falling over 29 days, resulting in a humidity level of 83%. In contrast, October boasts a warm climate, with temperatures reaching a maximum of 37°C (99°F) while averaging 28°C (82°F). Precipitation during this month is lower, totaling 171 mm (6.7 in) across 20 days, paired with a much drier humidity level of 32%. For a detailed overview of the climate, you can check Manaus weather in October.
In comparing the weather between December and November, December tends to be slightly cooler, with average temperatures ranging from a minimum of 22°C (72°F) to a maximum of 34°C (93°F), while November exhibits a higher average temperature, peaking at 35°C (96°F) with a minimum of 23°C (73°F). Additionally, December experiences significantly more rainfall, totaling 356 mm (14.0 in) over 29 days, compared to November's 219 mm (8.6 in) over 25 days. This increase in precipitation during December is accompanied by much higher humidity levels at 83%, contrasting with November's relatively lower humidity of 41%. For more detailed insights into November weather patterns, you can visit Manaus weather in November.
In December, Manaus experiences a unique blend of warm temperatures and high humidity, making it distinctly different from other months. With an average temperature around 26°C (79°F), the city feels quite tropical, but the maximum highs can reach up to 34°C (93°F). However, this warmth is accompanied by significant rainfall, with nearly every day of the month seeing precipitation, resulting in a substantial total of 356 mm (14.0 in). The 83% humidity can amplify the sensation of heat, making it essential for visitors to stay hydrated and prepared for the rain. To learn more about what to expect throughout the year, check out Manaus Climate.