Last updated: August 21, 2025
September in Manaus, Brazil presents a warm and humid climate, with maximum temperatures peaking at an impressive 36°C (98°F) and an average of 28°C (83°F). The minimum temperature hovers around a comfortable 22°C (73°F), ideal for outdoor activities. However, this tropical city experiences a notable amount of rainfall, totaling 116 mm (4.6 in) over approximately 17 days, contributing to a humidity level of 52%. Visitors should embrace the vibrant atmosphere while being prepared for the occasional shower, making September a dynamic time to explore the unique culture and lush landscapes of Manaus.
In September, Manaus experiences warm and tropical weather, with temperatures reflecting the city's characteristic climate. The minimum temperature hovers around 22°C (73°F), while the average climbs to a comfortable 28°C (83°F), making it an inviting time for outdoor activities. As the month progresses, the maximum temperatures can reach up to 36°C (98°F), mirroring the peak warmth of the previous month. This slight uptick in average and maximum temperatures suggests a transition into the hotter period of the year, alongside the consistent humidity typical of the Amazon. With vibrant nature surrounding the city, September's balmy days beckon both adventurers and those seeking relaxation in this lush Brazilian paradise.
In September, Manaus experiences a notable uptick in precipitation, receiving 116 mm (4.6 in) of rain over 17 days. This marks a shift from the drier months of July and August, where rainfall dropped to record lows of 87 mm and 59 mm, respectively. Following the peak wet months of March through May, September acts as a transitional period, brimming with moisture that hints at the impending return of the more intense rainy season. As the city prepares for the wetter months ahead, the resurgence of rainfall provides a refreshing respite from the preceding dry spell, contributing to the lush greenery that characterizes this Amazonian region.
In September, Manaus experiences a notable dip in humidity, with levels dropping to 52%, the lowest for the year. This decline follows a trend of decreasing humidity from the peak of 90% in May to the more comfortable conditions of early fall. The transition from the heavy, moisture-laden air of earlier months brings a pleasant respite before humidity levels plunge even further in October, when they reach a striking 32%. As the rainforest city moves into this dry spell, residents and visitors alike can enjoy the refreshing change, making September one of the more appealing months to bask in Manaus's vibrant atmosphere.
In Manaus, Brazil, September sees a UV Index of 13, maintaining the trend of extreme exposure that begins in the earlier months of the year. This consistent high level of UV intensity underscores the region's tropical climate, where sun safety remains a priority year-round. After peaking at 16 from January to April, the index gently dips in late summer, but still demands vigilance with a burn time of just 10 minutes. As October rolls in with a similar UV index, it's clear that the sun's rays are relentless in this vibrant city nestled in the heart of the Amazon. For more detailed information on UV levels throughout the year, visit Manaus UV Index.
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In Manaus, Brazil, September marks a remarkable transition as the sun shines brightly for approximately 310 hours, continuing the trend of summer’s late-week warmth. Following the sunniest months of July and August, where residents relished over 327 and 324 hours of sunlight respectively, September maintains this vibrant energy, reflecting the lush beauty of the Amazon. This gradual decline from peak sunshine doesn’t dim the vibrancy of the region; instead, it ushers in a sense of balance as autumn approaches. With October also offering a healthy 294 hours of sunlight, it becomes clear that Manaus basks in a warm glow that delights both locals and visitors alike throughout this enchanting period.
In September, Manaus experiences a 33% chance of sunny weather, making it one of the more promising months for sunlight as the year transitions from the dry season to the wetter months. This figure reflects a notable increase compared to earlier months like March and April, which see sunshine probabilities hovering around just 9% to 10%. Interestingly, the likelihood of clear skies peaks in August at 42%, setting a high note before September's slight dip. As the year progresses, sunshine prospects plunge once again into the lower ranges in the closing months, particularly in December, which plummets to only 8%. Thus, September stands out as a vibrant month, bridging the sunny delights of late winter with the impending rainfall, making it an appealing time for outdoor activities in this lush Brazilian city.
In Manaus, Brazil, the daylight duration experiences a remarkable consistency throughout the year. From January to April, residents enjoy an uninterrupted 12 hours of daylight, embracing the energy of the sun. As May rolls in, there is a slight dip, with daylight reducing to 11 hours, a trend that continues through June and July. However, August heralds a return to longer days with 12 hours of daylight, which continues into September and remains steady through to November. This cyclical pattern showcases the tropical climate's relatively stable light conditions, allowing for an abundance of sunlight that influences both daily life and the lush biodiversity of the Amazon region.
In September, Manaus experiences a slight dip in wind speed, averaging 1.3 m/s (3 mph). This aligns with a general trend observed throughout the year, where wind velocities are relatively low, with only a handful of months peaking slightly higher. Prior to September, the wind speed reaches its highest in August at 1.6 m/s (4 mph), suggesting a gentle ebb as the region transitions into the heart of the Amazon's serene atmosphere. Despite the reduced breeze, the climate remains warm and humid, creating a unique blend of tranquility and vitality that characterizes this vibrant city during the September wind. As the year progresses, the wind speed tends to hover around the same steady pace, showcasing a rhythmic consistency that reflects the lush, untamed beauty of the surrounding rainforest.
Weather in Manaus varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Manaus, focusing on differences in temperature, rainfall, humidity, and UV levels.
In September, the weather in Manaus is generally warmer, with average temperatures reaching 28°C (83°F) and occasional highs up to 36°C (98°F). The month experiences a total of 116 mm (4.6 in) of rainfall spread over 17 days, accompanied by a humidity level of 52%. In contrast, January sees cooler temperatures, with an average of 26°C (79°F) and maximums around 34°C (93°F). However, it is significantly wetter, with 238 mm (9.4 in) of precipitation over 23 days and a much higher humidity of 83%. To learn more about Manaus weather in January, visit the link for a detailed overview.
In September, the weather is typically hot and humid, with average temperatures reaching around 28°C (83°F) and maximums soaring up to 36°C (98°F). The month sees about 116 mm (4.6 in) of precipitation over 17 days, contributing to a humidity level of 52%. In contrast, February experiences slightly cooler temperatures, averaging 26°C (79°F) and peaking at 33°C (92°F). However, it is considerably wetter, receiving 242 mm (9.5 in) of rain across 24 days and exhibiting higher humidity at 73%. For a more detailed look at February weather in Manaus, you can visit Manaus weather in February.
In comparing the weather patterns of September and March, one can observe distinct differences in temperature and precipitation. September offers a warmer climate with average temperatures reaching up to 28°C (83°F) and maximums soaring to 36°C (98°F), whereas March presents slightly cooler averages of 26°C (80°F) and maxima of 33°C (93°F). However, March is notably wetter, receiving 349 mm (13.7 in) of rain over 28 days, compared to September’s 116 mm (4.6 in) across 17 days. Additionally, humidity levels are significantly higher in March at 75%, compared to September's 52%. For a more detailed look at March weather in Manaus, you can visit Manaus weather in March.
September and April present notable differences in weather patterns. September boasts warmer temperatures, with an average of 28°C (83°F) and a maximum of 36°C (98°F), while April averages a cooler 26°C (79°F) and peaks at 33°C (92°F). However, April is considerably wetter, recording 341 mm (13.4 in) of rain over 29 days, compared to September's 116 mm (4.6 in) over just 17 days. The humidity also reflects this disparity, soaring to 85% in April, while September remains relatively lower at 52%. For more detailed insights into April's weather, you can check Manaus weather in April.
When comparing the weather in September and May, it's clear that both months have warm temperatures, with September averaging 28°C (83°F) and May slightly cooler at 26°C (80°F). However, September experiences less precipitation at 116 mm (4.6 in) over 17 days, while May is significantly wetter, with 316 mm (12.5 in) of rain spread over 29 days. Additionally, May has a much higher humidity level at 90%, resulting in a more humid atmosphere compared to September's 52%. For more details, you can visit Manaus weather in May.
In comparing the weather of September and June, September tends to be hotter, with average temperatures reaching up to 28°C (83°F) compared to June's 27°C (80°F). However, June boasts a more humid environment at 84%, compared to September's relatively lower humidity of 52%. Rainfall is also more frequent in June, with precipitation on about 22 days and totaling 147 mm (5.8 in), while September sees precipitation on 17 days and a total of 116 mm (4.6 in). For a detailed look into June's weather, you can check Manaus weather in June.
In comparing the weather in September and July, September tends to be slightly warmer, with temperatures ranging from a minimum of 22°C (73°F) to a maximum of 36°C (98°F), while July has a more moderate range from 21°C (70°F) to 34°C (93°F). Additionally, September experiences higher rainfall, with 116 mm (4.6 in) falling over 17 days, compared to July's 87 mm (3.4 in) over 16 days. Humidity levels are also notably different; September has a lower average humidity of 52%, while July's humidity is significantly higher at 71%. For more detailed information about July's weather, check out Manaus weather in July.
In comparing the weather between August and September, we see that both months have similar temperature ranges, with minimum temperatures around 22°C (73°F), average temperatures at approximately 28°C (83°F), and maximum temperatures peaking at 36°C (98°F). However, September experiences significantly higher rainfall, recording 116 mm (4.6 inches) over 17 days, compared to August's 59 mm (2.3 inches) over 13 days. Additionally, September has a slightly lower humidity level at 52%, while August stands at 56%. For more detailed information on August weather in Manaus, you can visit Manaus weather in August.
September and October exhibit similar temperature patterns, with both months featuring a minimum temperature of around 22°C (73°F) and an average temperature of 28°C (83°F). However, October tends to be slightly warmer, reaching a maximum of 37°C (99°F) compared to September's 36°C (98°F). Precipitation increases significantly in October, with a total of 171 mm (6.7 in) over 20 days, as opposed to September's 116 mm (4.6 in) over 17 days. This results in lower humidity levels in October at 32%, compared to September's 52%. For more detailed information, you can check out Manaus weather in October.
In September, the weather is characterized by higher average temperatures, peaking at around 36°C (98°F), with a minimum of 22°C (73°F) and a relatively high humidity of 52%. This month sees a significant amount of rainfall, totaling 116 mm (4.6 in) over 17 days. In contrast, November presents slightly cooler conditions, with an average temperature of 27°C (81°F) and a maximum of 35°C (96°F). However, November experiences even more rainfall, accumulating 219 mm (8.6 in) over 25 days, along with a decrease in humidity to 41%. For more detailed information, you can check Manaus weather in November.
In September, temperatures in Manaus typically 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). The month experiences moderate humidity at around 52% and receives approximately 116 mm (4.6 in) of precipitation over 17 days. In contrast, December sees slightly cooler temperatures, with a minimum of 22°C (72°F), an average of 26°C (79°F), and a maximum of 34°C (93°F). However, the month is characterized by significantly higher humidity at 83% and a substantial increase in precipitation, totaling 356 mm (14.0 in) over 29 days. For more insights, you can check Manaus weather in December.
As September unfolds in Manaus, the weather begins to showcase its unique characteristics. Compared to the other months, this period experiences a noticeable warmth with higher maximum temperatures that can soar up to 36°C (98°F), while the humidity remains relatively moderate at 52%. Rainfall, although persistent with around 17 days of precipitation totaling 116 mm (4.6 in), often comes in brief showers, offering a refreshing break from the heat. This blend of warmth and moisture creates a lush environment, setting September apart in the tropical landscape of the Amazon. For a deeper dive into Manaus' weather patterns, explore Manaus Climate.