Last updated: August 21, 2025
September in Brasilia, Brazil offers a delightful transition into spring, characterized by warm temperatures that can reach a maximum of 35°C (96°F) and an average around 24°C (76°F). The nights cool off with minimum temperatures dropping to 13°C (56°F). With only 12 mm (0.5 in) of rainfall over the month, spread across just 2 days, the city enjoys plenty of dry, sunny weather. Coupled with a 34% humidity, September is ideal for outdoor activities and sightseeing, making it a charming time to experience this vibrant capital.
In September, Brasilia begins to warm up noticeably as it transitions into spring, with temperatures ranging from a cool minimum of 13°C (56°F) to a sizzling maximum of 35°C (96°F). The average temperature climbs to a comfortable 24°C (76°F), encouraging outdoor activities and vibrant city life. This month marks a significant shift from the cooler winter months of July and August, where the temperatures hovered around the low 10s. As September unfolds, residents and visitors alike relish the blend of warmth and sunshine, making it an ideal time to explore the unique architectural beauty and lush landscapes of Brazil's capital.
September in Brasília, Brazil, marks a notable transition in precipitation patterns as the dry season begins to ease. With just 12 mm (0.5 in) of rain recorded over a mere 2 days, this month continues the trend of dry weather established from June to August, where rainfall was almost negligible. However, this slight uptick signals the impending shift towards more substantial rainfall, which typically begins in October, when precipitation levels rise dramatically to 100 mm (3.9 in). In the broader context, September serves as a gentle precursor to the wetter months ahead, contrasting sharply with the lush conditions expected in November and December, when rainfall peaks at 199 mm (7.9 in) and 243 mm (9.6 in), respectively. This gradual reintroduction of rain is crucial for local ecosystems, setting the stage for a vibrant and flourishing landscape.
As September rolls into Brasilia, Brazil, the city's humidity experiences a significant drop, reaching a refreshing 34%. This marked decline continues the downward trend observed since the peak of 90% in March. After months of high humidity during the sweltering summer, September offers a welcome respite, signaling the transition towards the drier months ahead. By October, humidity levels plunge further to a mere 26%, emphasizing the shift in weather patterns and inviting locals and visitors alike to enjoy the crisp, less muggy atmosphere. This change not only enhances outdoor activities but also marks the beginning of a drier phase in Brasilia's climate cycle.
In Brasilia during September, the UV Index reaches a significant 14, categorizing it as extreme and indicating a burn time of just 10 minutes. This month continues the trend of high UV exposure experienced since the start of the year, where indices regularly topped out between 13 and 16. As we transition from winter to spring in Brazil, the upward shift in UV values underscores the importance of sun protection measures, particularly since both October and November mirror September's intensity. To prepare for outdoor activities, it's essential to stay informed and protect your skin from harmful rays. For more information, check out the detailed Brasilia UV Index.
UV Risk Categories
As September rolls into Brasilia, the city basks in a delightful 329 hours of sunshine, continuing the trend of radiant weather from the months prior. This month stands out among the late winter and early spring months, closely trailing August's impressive 334 hours. The steady increase in sunshine hours from May's 325 hours through to September hints at a warming atmosphere, inviting both locals and visitors to enjoy the outdoors. Following this bright period, the sunlight begins to taper off slightly in October, yet the vibrant energy of Brasilia remains, fueled by its sun-drenched days. It's clear that September is a pivotal month, marking a transition where the days grow longer and the city's natural beauty shines even brighter.
September in Brasília, Brazil, presents a notable shift towards sunnier days, with a 68% chance of sunshine. This month follows the bright days of July, which boasts an impressive 91% likelihood of sun, and the relatively clear skies of August at 71%. As the dry season begins to wane, September offers a delightful balance of warmth and brightness, making it an ideal time for outdoor activities. While the chance of sun decreases in the following months, with October dipping to 30% and November further declining, September stands out as a prime opportunity to enjoy the sun before the wetter months arrive.
In Brasilia, the rhythm of daylight shifts throughout the year, creating a fascinating pattern. From January to March, the city basks in a consistent 12 hours of daylight, providing ample time for adventure and exploration. As the months transition into April through August, daylight narrows slightly to 11 hours, marking a brief period of shorter days. However, come September, the daylight duration returns to 12 hours, signaling the approach of spring and revitalizing the atmosphere. This rhythm continues into October and November, maintaining that same generous 12-hour span before ultimately blossoming into 13 hours in December, just in time for the festive season. This cyclical dance of daylight not only highlights Brasilia's unique position on the globe but also invites visitors and locals alike to make the most of the glowing hours throughout the year.
As September unfolds in Brasília, the city experiences a gentle breeze, with average wind speeds reaching 2.5 m/s (6 mph). This marks a slight dip from August's peak of 2.9 m/s (7 mph), after a month of increasingly brisk winds. The transition into September reflects a subtle shift in the seasonal pattern, as winds generally begin to ease after summer's height. Nonetheless, the prevailing breeze still carries a sense of freshness, bridging the gap between the warmer months and the cooler days ahead. Following a gradual rise in wind speeds from May through August, the September winds create a comfortable and inviting atmosphere, perfect for outdoor pursuits and enjoying the vibrant surroundings of Brazil's capital.
Weather in Brasilia varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Brasilia, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January in Brasilia present notably different weather patterns. In September, temperatures range from a minimum of 13°C (56°F) to a maximum of 35°C (96°F), with an average of 24°C (76°F). The month experiences low humidity at 34% and minimal rainfall, totaling just 12 mm (0.5 in) over 2 days. In contrast, January sees slightly warmer temperatures, with a minimum of 16°C (60°F) and a maximum of 32°C (90°F), but an average cooler than September at 23°C (73°F). However, January is characterized by significantly higher humidity at 86% and substantial rainfall of 124 mm (4.9 in) over 14 days. For more details, visit Brasilia weather in January.
In comparing the weather of September and February, we can observe striking differences. September typically enjoys a warmer and drier climate, with average temperatures ranging from 24°C (76°F) to a maximum of 35°C (96°F), coupled with only 12 mm of rainfall over just 2 days and a low humidity of 34%. In contrast, February is marked by a more humid and rainy environment, featuring average temperatures from 22°C (72°F) to a maximum of 32°C (91°F), alongside a substantial 259 mm of precipitation spread across 21 days and a high humidity level of 89%. For a more detailed look at February's weather, you can visit Brasilia weather in February.
In September, the weather tends to be pleasantly warm, with average temperatures around 24°C (76°F) and maximums reaching up to 35°C (96°F). The humidity is relatively low at 34%, and there is minimal precipitation, averaging just 12 mm over 2 days. In contrast, March brings more humid conditions with significantly cooler average temperatures of 22°C (72°F) and a higher minimum of 16°C (61°F). It experiences much more rainfall, totaling 187 mm over 20 days, resulting in a humidity level of 90%. This stark difference illustrates the transition from the dry, warm end of the year in September to the wet and humid conditions typical of March. For more details, you can check Brasilia weather in March.
In comparing the weather conditions of September and April, notable differences emerge. September boasts warmer temperatures with a minimum of 13°C (56°F) and a maximum reaching 35°C (96°F), alongside relatively low humidity at 34% and only 12 mm (0.5 in) of precipitation over just 2 days. In contrast, April presents cooler temperatures, with a minimum of 15°C (58°F) and a maximum of 31°C (87°F), but it is significantly wetter; experiencing 104 mm (4.1 in) of rainfall across 14 days and high humidity at 82%. For a more detailed overview of April's weather, you can visit Brasilia weather in April.
In comparing the weather of September and May, we can observe some distinct differences. September typically experiences higher temperatures, with a minimum of 13°C (56°F) and an average of 24°C (76°F), soaring up to a maximum of 35°C (96°F), while May's temperatures are cooler, ranging from a minimum of 5°C (41°F) to an average of 21°C (70°F) and maxing out at 29°C (84°F). Precipitation is relatively low in September, with only 12 mm (0.5 in) over 2 days, whereas May sees slightly more rainfall at 19 mm (0.7 in) spread over 3 days. Additionally, humidity levels are notably higher in May at 65%, compared to the drier conditions in September, which sits at only 34%. For more details on May's climate, you can check out Brasilia weather in May.
In September, the weather is generally warmer compared to June, with temperatures ranging from a minimum of 13°C (56°F) to a maximum of 35°C (96°F), while June sees milder temperatures with a minimum of 10°C (50°F) and a maximum of 29°C (85°F). September also experiences slightly more rainfall, averaging 12 mm over two days, in contrast to June’s almost dry month with only 1 mm of precipitation. Additionally, the humidity levels are noticeably lower in September at 34%, compared to a much higher 59% in June, contributing to the overall feeling of warmth and dryness in September. For more detailed information, you can refer to Brasilia weather in June.
When comparing the weather in September and July, September generally showcases warmer temperatures, with a minimum of 13°C (56°F) and a maximum of 35°C (96°F), compared to July's cooler range of 8°C (47°F) to 29°C (85°F). The average September temperature reaches 24°C (76°F), significantly higher than July’s average of 19°C (67°F). Additionally, September experiences slight rainfall, with 12 mm (0.5 in) over just 2 days, while July remains completely dry with no precipitation recorded. Humidity levels also differ, as September maintains a lower humidity at 34%, whereas July has a higher humidity of 53%. For those interested in further details, you can visit Brasilia weather in July.
In September, the weather is generally warmer than in August, with average temperatures rising to 24°C (76°F), compared to August’s 22°C (72°F). The minimum temperatures are also slightly higher at 13°C (56°F) in September versus 11°C (52°F) in August, while the maximum temperatures peak at 35°C (96°F) in September compared to 32°C (90°F) in August. Although September sees a slight increase in precipitation to 12 mm (0.5 in) over 2 days, August remains drier with just 3 mm (0.1 in) and no rainy days. Additionally, humidity levels in September are lower at 34%, whereas August features a higher humidity of 44%. For more detailed information on August weather, visit Brasilia weather in August.
September and October present distinct weather patterns, with October generally being warmer and wetter. In September, temperatures range from a minimum of 13°C (56°F) to a maximum of 35°C (96°F), accompanied by low humidity at 34% and minimal precipitation of only 12 mm (0.5 in) over 2 days. In contrast, October experiences slightly higher temperatures, with a minimum of 15°C (60°F) and a maximum of 36°C (98°F), while significantly increasing rainfall to 100 mm (3.9 in) spread across 14 days, alongside a drop in humidity to 26%. For more detailed insights into October weather, you can check Brasilia weather in October.
September and November present contrasting weather patterns. In September, temperatures range from a minimum of 13°C (56°F) to a maximum of 35°C (96°F), with an average of 24°C (76°F). Precipitation is quite low during this month, totaling only 12 mm (0.5 in) over just two days, resulting in a humidity level of 34%. In stark contrast, November sees higher humidity at 50%, with temperatures ranging from 17°C (62°F) to 33°C (92°F) and an average of 22°C (72°F). However, November is also marked by significantly increased rainfall, totaling 199 mm (7.9 in) across 22 days. For more details, you can check out Brasilia weather in November.
In September, the weather is typically warm and dry, with temperatures ranging from a minimum of 13°C (56°F) to a maximum of 35°C (96°F) and an average of 24°C (76°F). The humidity is relatively low at 34%, and there is only light precipitation, totaling 12 mm (0.5 in) over just 2 days. In contrast, December experiences cooler temperatures, with a minimum of 16°C (61°F) and a maximum of 32°C (90°F), averaging 22°C (72°F). However, December is much wetter, with a staggering 243 mm (9.6 in) of rain over 22 days and significantly higher humidity at 70%. For more details on the December weather in Brasilia, you can check Brasilia weather in December.
September in Brasília marks a transition into warmer days and drier conditions, making it stand out from the milder, rainier months of the previous season. With higher maximum temperatures welcomed by the city, the warm sun often overshadows the brief rainy spells, which occur infrequently. The humidity level remains relatively low, providing a comfortable atmosphere for outdoor activities and exploration. Overall, September is a delightful month for those seeking to experience Brasília's vibrant culture while enjoying its favorable weather. For more detailed insights, check out Brasilia Climate.