Last updated: August 21, 2025
September in Belém, Brazil brings a warm and humid climate, with daily maximum temperatures reaching up to 34°C (94°F) and an average of 28°C (82°F). Evenings cool down slightly to a minimum of 23°C (74°F), providing some respite from the heat. The month sees an average precipitation of 39 mm (1.6 in), spread across 10 days, contributing to the lush surroundings typical of this region. With humidity levels hovering around 69%, visitors can expect a tropical atmosphere, perfect for exploring the vibrant culture and stunning landscapes of this Amazonian city.
In September, the temperatures in Belém, Brazil, continue the warm trend established throughout the year, maintaining a comfortable minimum of 23°C (74°F). The average temperature rises to 28°C (82°F), while the maximum can reach a sizzling 34°C (94°F). This month marks a seamless transition into the hotter season, mirroring the patterns from August where similar highs were recorded. With consistent warmth and minimal fluctuations, September is ideal for enjoying Belém's lush surroundings and vibrant culture, making it a fantastic time to immerse yourself in this Amazonian paradise.
In September, Belem experiences a sharp decline in precipitation, with only 39 mm (1.6 in) of rain over 10 days. This marks a notable decrease from the rain-soaked months preceding, especially when compared to the 471 mm (18.6 in) in March and even 288 mm (11.3 in) in May. The transition into September signals a shift towards drier conditions that continue through October, during which the city receives an equivalent amount of rain. With this drop in rainfall, Belem begins to embrace the tail end of its drier season, highlighting a significant seasonal shift in its climate pattern.
In September, humidity in Belém, Brazil typically decreases to 69%, reflecting a notable shift from the high levels of earlier months. Following the peak humidity of 89% in May and the moderately high levels sustained through the winter, September brings a breath of fresh air as the region transitions towards drier conditions. This slight dip continues into October, maintaining the same humidity level. While the humidity begins to rise again in November, reaching 71%, the notable decline in September marks a seasonal change, signaling the end of the more oppressive, humid weather typical of the preceding months.
As September rolls into Belém, Brazil, the UV Index remains a significant concern, peaking at 13—an extreme level that signals caution for sun-seekers. This month continues the trend observed since the start of the year, with consistently high UV ratings making sun protection a necessity. Although the index slightly dips from March's peak of 16, it still maintains the same critical burn time of just 10 minutes across most months. Residents and visitors alike should stay vigilant and informed about their UV exposure to enjoy the vibrant days characteristic of Belém's tropical climate. For more insights, check out the detailed Belem UV Index.
UV Risk Categories
As September rolls in, Belem, Brazil, enjoys 333 hours of sunshine, contributing to a vibrant atmosphere that heralds the start of spring. This month is part of a remarkable trend, showcasing a gradual increase in daylight hours from the cooler months of June and July, which boast 311 and 343 hours respectively. The sunny disposition truly shines in August, when Belem experiences its peak, with an impressive 346 hours. While the sunshine begins to taper slightly into October with 344 hours, September beautifully bridges the gap, offering a warm, golden embrace that invites locals and tourists alike to bask in outdoor adventures under the radiant sky.
September in Belém, Brazil, offers a promising chance of sunny weather with a 53% likelihood of sunshine, making it one of the more favorable months for outdoor activities. This slight dip from the peak sunny conditions in August (54%) maintains a trend of increasing sunshine that begins in mid-year, following a relatively overcast and rainy season. As the months progress from June's 50% and July's 48%, September showcases a delightful transition into more favorable weather patterns, hinting at the lush beauty that the rainforest surroundings embrace. As temperatures remain warm, now is the perfect time to explore the stunning landscapes, vibrant culture, and rich biodiversity that define this enchanting region.
In Belém, Brazil, September marks the continuation of a remarkably consistent daylight pattern throughout the year, with an unwavering 12 hours of daylight each day. This steady exposure to sunlight not only fosters a vibrant outdoor lifestyle but also enhances the lush, tropical environment that the region is known for. Unlike many places that experience varied daylight hours across seasons, Belém's stable sunlight creates a unique rhythm, allowing locals and visitors alike to enjoy a balance of day and night, fostering a harmonious connection to nature. As September unfolds, this unchanging daylight duration sets the stage for lively street markets, captivating cultural festivities, and the ever-present allure of the Amazon rainforest.
As September unfolds in Belém, Brazil, the average wind speed begins to pick up its pace, reaching 2.6 m/s (6 mph)—the highest since February. This subtle increase in wind speed marks a transition towards the more dynamic conditions of autumn, a shift mirrored in the data where warmer months generally see lower breezes. The wind revitalizes the atmosphere, enhancing the coastal charm of the city as it welcomes the vibrant colors of the changing season. September's gentle gusts lay the groundwork for the stronger breezes that follow in October, suggesting a pattern of growing momentum that not only invigorates the landscape but also invites residents and visitors alike to savor the fresh air of Belém.
Weather in Belem varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Belem, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January in Belem exhibit distinct differences in weather patterns. In September, the temperatures range from a minimum of 23°C (74°F) to a maximum of 34°C (94°F), with an average of 28°C (82°F). This month experiences relatively low precipitation of 39 mm (1.6 in) across about 10 days, combined with a humidity level of 69%. In contrast, January sees slightly cooler average temperatures, ranging from 23°C (73°F) to a maximum of 32°C (90°F) and an average of 26°C (80°F). However, January is characterized by significantly higher precipitation, totaling 232 mm (9.1 in) over approximately 25 days, and elevated humidity levels at 89%. For more detailed insights, view the full report on Belem weather in January.
In September, the weather features warmer temperatures, with a minimum of 23°C (74°F) and an average high of 34°C (94°F), alongside moderate humidity at 69%. During this month, precipitation is relatively low at 39 mm (1.6 in) over about 10 days. In contrast, February experiences a cooler average temperature range, with a maximum of 32°C (90°F), but it brings significantly heavier rainfall totaling 439 mm (17.3 in) across 27 days, accompanied by higher humidity at 81%. For more details on the climate during this month, you can check Belem weather in February.
In September, the weather tends to be warmer, with average temperatures ranging from a minimum of 23°C (74°F) to a maximum of 34°C (94°F), and an average of 28°C (82°F). The month typically sees 39 mm (1.6 in) of precipitation over about 10 days, resulting in a humidity level of 69%. In contrast, March experiences slightly cooler average temperatures, with a minimum of 23°C (74°F), an average of 26°C (79°F), and a maximum of 32°C (90°F). However, it is much wetter, with a staggering 471 mm (18.6 in) of rainfall spread over 30 days, leading to higher humidity at 81%. For a more detailed look at the weather patterns, you can check Belem weather in March.
September and April exhibit distinct weather patterns, particularly in terms of temperature and precipitation. In September, the climate is warmer with average temperatures reaching 28°C (82°F), peaking at 34°C (94°F), while April is slightly cooler, averaging 26°C (80°F) and maxing out at 32°C (91°F). However, April sees significantly higher rainfall, with a staggering 416 mm (16.4 in) spread over 30 days, compared to September's more moderate 39 mm (1.6 in) over just 10 days. Additionally, the humidity in April is elevated at 85% versus September's 69%, contributing to a more humid atmosphere. For those interested in a detailed overview, check out Belem weather in April.
Comparing the weather in September and May reveals some notable differences. In September, temperatures are generally warm, with a minimum of 23°C (74°F), an average of 28°C (82°F), and a maximum of 34°C (94°F). The month experiences relatively low precipitation at 39 mm (1.6 in) over about 10 days, along with a moderate humidity level of 69%. In contrast, May tends to be wetter and more humid, featuring similar minimum temperatures at 23°C (74°F) but a slightly lower average of 27°C (81°F) and a maximum of 33°C (91°F). This month sees significant rainfall, with 288 mm (11.3 in) spread across 27 days and higher humidity at 89%. For more detailed information, you can check Belem weather in May.
In comparing the weather of September and June, both months feature similar minimum temperatures, averaging around 23°C (74°F). However, September experiences slightly higher average and maximum temperatures, with averages reaching 28°C (82°F) and highs of 34°C (94°F), compared to June's averages of 27°C (82°F) and maximums of 33°C (91°F). Additionally, September has significantly less precipitation, totaling 39 mm (1.6 in) over about 10 days, while June sees much higher rainfall of 114 mm (4.5 in) over 20 days. The humidity is also notably higher in June at 86%, compared to 69% in September. For more specifics, you can check Belem weather in June.
In comparing the weather of September and July, we see that both months feature similar minimum temperatures, hovering around 23°C (73°F to 74°F), but September experiences slightly warmer average and maximum temperatures, with averages reaching 28°C (82°F) and highs of 34°C (94°F). However, July tends to be wetter, with a higher total precipitation of 76 mm (3.0 in) over 15 days, compared to September's 39 mm (1.6 in) over 10 days. Additionally, July has higher humidity levels at 81%, while September’s humidity stands at 69%. For more detailed insights, you can check Belem weather in July.
In comparing the weather of September and August, we find that both months experience similar temperature ranges, with minimums at 23°C (74°F), average highs of 28°C (82°F), and max temperatures reaching 34°C (94°F). However, September sees slightly less precipitation, with 39 mm (1.6 in) compared to August's 44 mm (1.7 in), despite both months experiencing rain on 10 days. Humidity levels also decrease slightly in September, averaging 69% compared to August's 72%. For more detailed information, you can check Belem weather in August.
In September, the weather features a minimum temperature of 23°C (74°F) and an average of 28°C (82°F), while reaching maximums of 34°C (94°F). The month experiences a total precipitation of 39 mm (1.6 in) over approximately 10 days, with humidity consistently around 69%.
Transitioning into October, temperatures see a slight rise with minimums at 24°C (75°F), maintaining an average of 28°C (83°F) and maxing out at 34°C (93°F). Precipitation remains similar at 39 mm (1.5 in), but the number of wet days increases to 11, all while humidity levels stay steady at 69%. For more detailed insights, check out Belem weather in October.
In comparing the weather between September and November, we see some notable similarities and differences. Both months feature a warm average temperature of around 28°C (82°F), with maximum temperatures peaking at 34°C (94°F) in September and 34°C (93°F) in November. However, while September has a slightly lower minimum temperature of 23°C (74°F) compared to November's 24°C (75°F), November brings a significant increase in precipitation, totaling 97 mm (3.8 in) over 13 days of rain, compared to September's 39 mm (1.6 in) over 10 days. Additionally, humidity remains relatively high in both months, with September at 69% and November at 71%. For more details on the weather conditions in November, you can check Belem weather in November.
In September, the weather is typically warm and slightly drier, with average temperatures ranging from 23°C (74°F) to a high of 34°C (94°F) and only 39 mm (1.6 in) of precipitation over about 10 days. Humidity sits at a comfortable 69%. In contrast, December experiences higher humidity at 82% and significantly increased rainfall, accumulating 170 mm (6.7 in) over approximately 23 days, while average temperatures remain similar, with a minimum of 23°C (74°F) and a maximum of 34°C (94°F). For more details, check Belem weather in December.
As September unfolds in Belém, the weather evolves into a delightful experience, standing out from the preceding months with its warm embrace. With temperatures averaging a comfortable 28°C (82°F) and maximums reaching up to 34°C (94°F), it's a time when summer's lingering warmth becomes evident. Although occasional rain makes an entrance with about 39 mm (1.6 in) over roughly 10 days, it doesn't dampen the spirits, as humidity levels hover around 69%, adding a tropical touch. This month marks a transition, where the vibrant atmosphere begins to hint at the upcoming rainy season without overwhelming the sultry summer vibe. For a deeper dive into what to expect weather-wise, check out Belem Climate.