Last updated: January 18, 2025
The climate of Amazonas, Brazil, is characterized by its Köppen-Geiger climate classes of Am (Tropical Monsoon) and Af (Tropical Rainforest), resulting in a warm and humid environment throughout the year. Temperatures exhibit a notable range, with minimums dipping to 13°C (55°F) in August, while averages hover around 27°C (80°F). The region experiences sweltering conditions in October, reaching maximum temperatures of 39°C (102°F), underscoring the climatic extremes that define this unique part of the tropics.
In Amazonas, Brazil, temperature patterns exhibit a consistent warmth throughout the year, marked by subtle seasonal variations. The monthly minimum temperatures range from a low of 13°C (55°F) in July and August to higher averages of 21°C (70°F) in January, February, and December. Interestingly, average temperatures maintain stability around 26°C (79°F) to 27°C (81°F), indicating a comfortable warm climate. Maximum temperatures peak during the hotter months of October and August, reaching 39°C (102°F) and 38°C (101°F), respectively, while cooler months experience highs around 34°C (93°F) to 36°C (97°F). The region's temperature profile reveals a tropical consistency accentuated by brief dips in cooler months, making it a vivid example of a tropical climate with minimal fluctuation but distinct seasonal tendencies.
In the Amazonas region of Brazil, temperatures exhibit a warm tropical climate across three key cities. Itacoatiara has a minimum temperature of 22°C (73°F) in January and reaches a maximum of 35°C (96°F) in October, while Parintins records a similar minimum of 22°C (72°F) in April and peaks at 35°C (95°F) in October. Manaus experiences the coolest minimum temperature at 21°C (70°F) in July, with a notable maximum of 37°C (99°F) in October. For more detailed monthly temperature variations, you can visit monthly temperatures in Itacoatiara, monthly temperatures in Parintins, and monthly temperatures in Manaus.
Precipitation in Amazonas, Brazil, showcases a pronounced seasonal cycle, with the wettest months typically occurring from December through May. January starts the year with substantial rainfall, averaging 261 mm (10.3 in) over 23 days, while February sees an increase to 296 mm (11.6 in). The trend peaks in April, noted for its highest rainfall of 341 mm (13.4 in) across 28 days, signaling the onset of the peak rainy season. Following April, precipitation remains considerable but begins to decline, with May recording 291 mm (11.4 in).
The dry season, particularly from June to August, is marked by significantly reduced rainfall, with June, July, and August receiving just 153 mm (6.0 in), 101 mm (4.0 in), and 81 mm (3.2 in), respectively. This period also corresponds with fewer rainy days, peaking at only 15 days in July and diminishing to 12 days in August. As the year progresses toward October, rainfall begins to increase again, culminating in December, where 332 mm (13.1 in) returns the region to its wetter climatic conditions. This cyclical rainfall pattern profoundly influences the region's biodiversity and agricultural practices, underpinning the ecological richness of the Amazon rainforest.
Sunshine duration in Amazonas, Brazil, exhibits a clear seasonal trend, with notable increases from the beginning of the year towards the middle months. Starting with 206 hours of sunshine in January, the hours gradually rise to a peak of 257 hours in May. The transition from the wet to the dry season is marked by this gradual increase, with March and April also showcasing substantial sunshine, at 240 hours and 225 hours, respectively. This consistent buildup culminates in the summer months, where June marks a significant jump, reaching 289 hours, and is closely followed by July and August, which boast 318 hours and 316 hours of brilliant sunlight, respectively.
Following this peak, sunshine hours begin a gentle decline as the year progresses into the latter months. Although September still enjoys an impressive 299 hours, hours decrease to 290 in October and further to 244 hours in November. December brings a total of 233 hours, indicating a return to lower sunlight levels as the rainy season reasserts itself. Overall, this cyclical pattern emphasizes the relationship between sunshine and seasonal weather changes in Amazonas, providing crucial insights into the region's climate and its implications for local ecology and agriculture.
In Amazonas, Brazil, the UV Index consistently reflects extreme levels throughout the year, presenting a significant health risk for residents and visitors alike. Beginning with a UV Index of 15 in January, the index peaks at 17 in March, underscoring the intensity of solar radiation experienced during the summer months. Even during the subsequent months, the UV Index remains high, with findings of 16 in both February and April, and 14 in May. Notably, despite fluctuations, the recommended burn time remains consistently low at just 10 minutes, highlighting the urgent need for sun protection measures.
As the year progresses, the UV Index shows a slight decrease from the peak summer readings, dropping to 12 during the mid-year months of June, July, and August. This decline offers a brief respite from extreme exposure, yet these levels still fall under the "extreme" exposure category. The UV Index rises again in September, peaking at 14, before returning to 15 for both October and November, and finally settling at 14 in December. This stable pattern of extreme UV radiation throughout the year emphasizes the importance of preventive strategies such as sunscreen application and protective clothing, particularly in a region where sun intensity poses considerable risks.
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Daylight duration in Amazonas, Brazil, remains relatively stable throughout the year, reflecting the region's proximity to the equator. From January to March, residents enjoy a consistent 12 hours of daylight daily, providing ample exposure to natural light. As the seasons shift, the duration slightly decreases to 11 hours from April through August. This gradual reduction marks the region's transition into the winter months, though the changes are still minimal compared to higher latitudes.
Interestingly, daylight duration rebounds in September, returning to 12 hours and maintaining this length through the end of the year. October, November, and December all feature the same 12 hours of daylight, allowing for a balanced cycle of light and dark. This consistency supports a stable ecological environment, favoring the growth of lush vegetation characteristic of the Amazon rainforest. Overall, the consistent daylight hours throughout the year highlight the minimal seasonal variation found in equatorial climates, reinforcing the tropical ambiance of Amazonas.
Itacoatiara, Brazil, experiences a tropical climate characterized by warm temperatures and significant rainfall throughout the year. Average temperatures hover around 27-29°C (81-84°F), with maximums reaching up to 35°C (96°F) in the hottest months of August and September. The region sees heavy rainfall, peaking in April with 387 mm (15.2 in) and decreasing during the drier months of July and August. Notably, sunshine hours are abundant, particularly from June to August, where daylight stretches to over 327 hours monthly. For more detailed information, visit Itacoatiara climate.
Manaus, Brazil, experiences a tropical climate characterized by high temperatures and significant rainfall throughout the year. Average temperatures range from a minimum of 21°C (70°F) in July to a maximum of 37°C (99°F) in October, with the warmest months being August and October. The rainy season peaks between December and March, with March being the wettest month at 349 mm (13.7 in) of precipitation. Despite the heavy rain, the city enjoys a substantial amount of sunshine, with July averaging 327 hours of sun. For more detailed information, visit Manaus climate.
Parintins, Brazil, experiences a tropical climate characterized by high temperatures and significant rainfall throughout the year. Average temperatures range from 26°C (80°F) to 28°C (83°F), with maximum temperatures peaking at around 35°C (95°F) during the warmer months of July to November. The wettest months are typically from December to April, with precipitation reaching up to 389 mm (15.3 in) in April. Sunshine is abundant, particularly in the dry season from May to August, where monthly sunshine hours can exceed 300. For more details on the climate, visit Parintins climate.
In conclusion, the climate of Amazonas, Brazil, is defined by its remarkable consistency in temperature, precipitation, and daylight duration throughout the year. With warm temperatures ranging from 13°C (55°F) to 39°C (102°F) and a pronounced rainy season contributing to lush biodiversity, the region is a prime example of a tropical environment. The significant UV Index elevates the importance of sun safety strategies for both locals and visitors, while stable daylight hours of approximately 12 hours foster a thriving ecosystem. Together, these climatic characteristics underscore the beauty and complexity of the Amazon, drawing attention to the need for sustainable practices that protect this irreplaceable natural treasure.