Last updated: August 21, 2025
In Itatiaia, Brazil, September presents a dynamic climate characterized by maximum temperatures reaching 33°C (92°F) and an average of 20°C (68°F), balanced by cooler nights with lows of 8°C (47°F). This month witnesses moderate humidity levels around 68%, contributing to a vibrant atmosphere. Rainfall is prevalent, with 90 mm (3.5 in) of precipitation spread over 11 days, adding a refreshing touch to the region’s stunning landscapes. September in Itatiaia offers a captivating blend of warm days and refreshing showers, perfect for exploring the beauty of this remarkable destination.
In September, Itatiaia experiences a pleasant transition into spring, with temperatures showing a notable increase compared to the chilly winter months. With a minimum of 8°C (47°F) and a comfortable average of 20°C (68°F), visitors can enjoy outdoor activities without the heavy layers. The highs can reach up to 33°C (92°F), making it one of the warmer months following August's cool embrace. This upward trend in temperatures signals the region's shift towards more vibrant days, perfect for exploring its stunning natural landscapes and rich biodiversity. As daylight hours lengthen, September invites not only pleasant weather but also a revitalization of the beautiful flora, marking the onset of a more dynamic climate.
In September, Itatiaia experiences a noticeable shift in precipitation patterns, receiving about 90 mm (3.5 in) of rain over 11 days. This marks a modest increase from the drier months of July and August, where rainfall dipped significantly, reaching lows of just 33 mm (1.3 in) and 71 mm (2.8 in), respectively. As the region transitions toward the more humid months of October and November, when precipitation can soar to over 200 mm (7.9 in) and 289 mm (11.4 in), September acts as a gentle precursor to the more intense rainfall. The slight uptick in rainfall reflects the beginning of a change in the weather cycle, laying the groundwork for the lush greenery that follows in the subsequent months.
As September arrives in Itatiaia, Brazil, the humidity begins to dip, marking a notable trend throughout the year. With levels dropping to 68%, September continues the gradual decline observed since the peak of the rainy season earlier in the year. This decrease follows a consistent pattern from the previous months, where humidity averages have steadily retreated from 85% in January and February to 73% in August. As the dry season sets in, residents and visitors alike can enjoy a more comfortable climate, preparing for the even drier months ahead in October, where humidity averages are forecasted to reduce to 61%.
In September, Itatiaia experiences a UV Index of 12, categorized as extreme, with a quick burn time of just 10 minutes. This places the month in line with the higher intensity levels observed from January to April, where indices consistently peak at 11 or above. Following a slight dip during May and June, the UV levels bounce back in September, maintaining caution for sun exposure practices. As the seasons shift towards warmer months, residents and visitors alike should stay alert to protect their skin, especially with such intense UV ratings. For more detailed insights, visit the Itatiaia UV Index.
UV Risk Categories
September in Itatiaia, Brazil, shines brightly with an impressive 298 hours of sunshine, making it one of the sunniest months of the year. This vibrant month follows a peak in July, which boasts the highest recorded sunshine at 300 hours, creating a warm embrace as the winter chill recedes. As autumn approaches, September stands out for its generous sunshine, just shy of March’s 300 hours. The gradual decline begins in October, where the sunshine dips to 267 hours, signaling the transition toward the cooler months. Overall, the trend showcases a beautiful tapestry of sunshine throughout the year, with September shining as a golden highlight in Itatiaia's climate.
In September, Itatiaia, Brazil, enjoys a promising 45% chance of sunny weather, reflecting a transition from the cooler months of winter. Following a peak of 63% sun in July, the chance of sunshine tends to fluctuate, with September mirroring the sunny disposition seen in April and June. While this month does not boast the highest probability of sunshine, it stands out as a reliable time for outdoor activities, nestled between the vibrant winter and the imminent onset of spring. Thus, visitors can expect a mix of sunshine and clouds, making it an ideal time to explore the stunning landscapes of Itatiaia.
As September unfolds in Itatiaia, Brazil, the daylight duration averages a pleasant 11 hours, mirroring the earlier months of late winter and welcoming the onset of spring. This month stands out with a harmonious balance, as it transitions from the shorter days of winter, which witness just 10 hours of daylight in June and July, to lengths that increasingly reach 12 hours by October. The gradual elongation of daylight in September marks a noteworthy shift from the colder months, promising brighter and longer days ahead. As the year progresses, residents can look forward to enjoying the gradual return of sunlight, with November and December featuring the longest days of the year at 13 hours, illuminating the vibrant landscapes of this beautiful region.
As September unfolds in Itatiaia, Brazil, the winds begin to whisper with a refreshing vigor that hints at the changing seasons. With an average wind speed of 1.6 m/s (4 mph), this month showcases an upward trend in wind intensity, marking a subtle departure from the more placid breezes of the earlier months. Following a steady increase from 1.5 m/s in August and leading into 1.7 m/s in October, September serves as a transitional period, encouraging an invigorating atmosphere that imbues both the landscape and its visitors with a sense of renewal. This gentle uptick in wind speed not only heralds the approach of spring but also offers an inviting backdrop for outdoor adventurers and nature enthusiasts alike.
Weather in Itatiaia varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Itatiaia, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January present notably different weather patterns. In September, temperatures range from a low of 8°C (47°F) to a comfortable average of 20°C (68°F), peaking at a hot 33°C (92°F). However, it experiences a moderate level of precipitation at 90 mm (3.5 in) over approximately 11 days, with humidity sitting at around 68%. In contrast, January brings milder temperatures with a minimum of 15°C (60°F), averaging 23°C (73°F), and reaching a maximum of 32°C (90°F). This month is considerably wetter, with 291 mm (11.5 in) of rain spread out over 20 days, resulting in higher humidity levels at 85%. For more specific details on January weather, you can refer to this link: Itatiaia weather in January.
September and February present contrasting weather patterns, despite sharing the same maximum temperature of 33°C (92°F). In September, temperatures range from a cool minimum of 8°C (47°F) to a comfortable average of 20°C (68°F), accompanied by 90 mm (3.5 in) of precipitation over 11 days and a humidity level of 68%. Conversely, February generally feels warmer with a minimum temperature of 15°C (60°F) and an average of 22°C (72°F). This month experiences significantly higher rainfall, totaling 333 mm (13.1 in) over 22 days and a higher humidity level of 85%. For more specifics on weather trends, check out Itatiaia weather in February.
In comparing the weather of September and March, September typically presents a milder climate, featuring average temperatures ranging from a low of 8°C (47°F) to a high of 33°C (92°F). It experiences less precipitation at 90 mm (3.5 in) across about 11 days, alongside a humidity level of 68%. In contrast, March tends to be warmer and wetter, with minimum temperatures starting at 13°C (55°F) and maximums reaching 31°C (89°F). The month also sees significantly higher rainfall at 281 mm (11.1 in) over 20 days, coupled with increased humidity at 86%. For more detailed information on this pattern, you can explore Itatiaia weather in March.
When comparing the weather in September and April, both months share a similar average temperature of around 20°C (68°F), but their minimum and maximum temperatures differ slightly. In September, temperatures range from a cool 8°C (47°F) at night to a warm 33°C (92°F) during the day, while April features a milder minimum of 11°C (52°F) and a maximum of 31°C (88°F). April also tends to be wetter, with 119 mm (4.7 in) of rainfall over 16 days compared to September's 90 mm (3.5 in) over 11 days, resulting in higher humidity levels of 83% in April versus 68% in September. For those looking to understand April's specific conditions, further details can be found here: Itatiaia weather in April.
In comparing the weather of September and May, we see notable differences in temperature and humidity. September experiences a wider temperature range, with minimums of 8°C (47°F) and maximums reaching up to 33°C (92°F), leading to an average temperature of 20°C (68°F). In contrast, May has milder conditions, with temperatures ranging from a minimum of 6°C (42°F) to a maximum of 28°C (83°F), averaging 18°C (64°F). Additionally, September has slightly more precipitation, totaling 90 mm (3.5 in) over 11 days, compared to May's 74 mm (2.9 in) over 10 days. The humidity in May is higher at 81%, while September's humidity sits at 68%. For a detailed look at conditions during May in this region, you can check out Itatiaia weather in May.
When comparing the weather in September and June, we see some notable differences. September temperatures range from a minimum of 8°C (47°F) to a peak of 33°C (92°F), with an average of 20°C (68°F). This month also experiences higher precipitation, totaling 90 mm (3.5 in) over 11 days, and a humidity level of 68%. In contrast, June has slightly cooler temperatures, with a minimum of 7°C (46°F) and a maximum of 29°C (84°F), averaging at 18°C (64°F). The rain is less frequent in June, with only 40 mm (1.6 in) falling over 9 days, but the humidity is higher at 80%. For a more detailed view of June weather, visit Itatiaia weather in June.
In comparing the weather of September and July, September generally exhibits a broader temperature range with minimums around 8°C (47°F), averages of 20°C (68°F), and maximums reaching up to 33°C (92°F). In contrast, July experiences milder temperatures, with minimums of 5°C (40°F), averages at 16°C (61°F), and maximums capping at 27°C (81°F). Notably, September also sees significantly more precipitation, with about 90 mm (3.5 in) over 11 days, compared to a mere 33 mm (1.3 in) over just 5 days in July. Additionally, humidity levels are slightly lower in September at 68% versus 76% in July. For more detailed insights, you can check Itatiaia weather in July.
In comparing the weather between August and September, September tends to be warmer and slightly wetter. The minimum temperature in September is higher at 8°C (47°F) compared to August's 5°C (41°F), with average temperatures reaching 20°C (68°F) in September versus 17°C (63°F) in August. Additionally, September experiences more extreme highs, with a maximum of 33°C (92°F) compared to August's 30°C (86°F). Precipitation also increases in September, with 90 mm (3.5 in) over 11 days, while August sees 71 mm (2.8 in) over 9 days. However, humidity levels are slightly lower in September at 68% compared to 73% in August. For more detailed insights, you can check Itatiaia weather in August.
September and October present noticeable contrasts in weather patterns. September typically sees a temperature range from a minimum of 8°C (47°F) to a maximum of 33°C (92°F), with an average of 20°C (68°F). This month receives about 90 mm (3.5 in) of precipitation over approximately 11 days, accompanied by a humidity level of 68%. In comparison, October experiences slightly warmer conditions with minimum temperatures rising to 12°C (53°F) and maximums reaching 34°C (93°F), averaging around 21°C (69°F). However, it also brings increased rainfall, amounting to 200 mm (7.9 in) distributed over 21 days, but with a slightly lower humidity of 61%. For more detailed insights on the weather, check Itatiaia weather in October.
September and November present distinct weather patterns. September boasts a wider temperature range, with minimums dipping to 8°C (47°F) and maximums reaching up to 33°C (92°F). The month averages around 20°C (68°F) and experiences about 90 mm (3.5 inches) of precipitation over 11 days, with humidity levels at 68%. In contrast, November sees slightly warmer minimum temperatures at 11°C (52°F) while the average remains consistent at 20°C (69°F). However, it experiences a significant increase in rainfall, totaling 289 mm (11.4 inches) over 21 days, coupled with a rise in humidity to 72%. For more specific details on November conditions, you can check Itatiaia weather in November.
September and December showcase distinct weather patterns. In September, temperatures range from a minimum of 8°C (47°F) to a maximum of 33°C (92°F), with an average of 20°C (68°F). This month sees about 90 mm (3.5 in) of precipitation over approximately 11 days and has a humidity level of 68%. In contrast, December offers milder temperatures, with a minimum of 12°C (53°F) and a maximum of 32°C (89°F), averaging 22°C (71°F). However, it also experiences significantly higher precipitation, totaling 414 mm (16.3 in) over 26 days, alongside increased humidity at 75%. For more detailed insights, check out Itatiaia weather in December.
September in Itatiaia brings a delightful transition as temperatures begin to warm up, offering a refreshing contrast to the cooler days of winter. With an average temperature of 20°C (68°F), the month strikes a comfortable balance, while still experiencing some chillier nights. Rainfall becomes more frequent, with 11 days of precipitation, which contributes to the lush landscapes characteristic of this region. The humidity level, sitting at 68%, adds a touch of moisture to the air, creating a vibrant and invigorating atmosphere. For those interested in learning more about weather trends in Itatiaia, visit Itatiaia Climate for comprehensive insights.