Last updated: August 21, 2025
In September, Atibaia, Brazil experiences a delightful transition in weather, showcasing a maximum temperature of 34°C (93°F) and an average of 21°C (69°F). The crisp mornings can drop to a refreshing 9°C (48°F), providing a pleasant contrast throughout the day. With about 44 mm (1.7 in) of rainfall over 6 days, the month brings a gentle touch of moisture, contributing to the region's lush greenery. The average humidity of 58% enhances the fresh, invigorating atmosphere, making September an ideal time to enjoy the natural beauty and vibrant culture of Atibaia.
In September, Atibaia, Brazil, marks a transition into the spring season, characterized by a delightful increase in temperatures. With minimums averaging around 9°C (48°F) and maximums soaring to 34°C (93°F), the month offers a warm embrace as summer approaches. The average temperature settles at 21°C (69°F), striking a balance that invites outdoor activities and exploration. This upward trend from the cooler winter months showcases Atibaia's vibrant climate as the days grow longer and the sun shines brighter, setting the stage for a lively springtime ambiance throughout the region.
In September, Atibaia experiences a continuation of the dry spell that begins mid-year, with precipitation totaling 44 mm (1.7 in) spread over just 6 days. This marks a slight increase from August's rainfall, which also recorded 50 mm but over a similar number of days. Compared to the heavier early-year months, where rainfall can exceed 180 mm, September stands out as part of the region's transition towards the drier months, reflecting a gradual decline in precipitation amounts that began in April. This pattern of diminishing rainfall continues into the latter part of the year, setting the stage for the upcoming rainy season that typically revives in October.
As September rolls in Atibaia, Brazil, the climate begins to shift noticeably, with humidity levels dropping to 58%—the lowest of the year. This decline marks a significant transition from the high humidity typical of the earlier months, which hover around the 88% mark in January and February. Throughout the year, humidity levels show a consistent downward trend, peaking in the spring and gradually decreasing through summer, ultimately leading into the drier months of October and November. The refreshing drop in humidity not only makes September more comfortable but also signals the onset of a seasonal change, inviting both residents and nature to embrace a new chapter in the year.
In September, Atibaia experiences an intense UV Index of 12, placing it back into the extreme exposure category where a swift burn can occur in just 10 minutes. This month marks a slight rebound after the preceding summer months, which were characterized by even higher levels of UV radiation. Throughout the year, Atibaia consistently faces high UV levels, particularly from January to April, where indices soar as high as 16. As the seasons transition, the UV Index demonstrates a gradual decline, reaching a low of 7 in June, only to rise again in the latter part of the year. The persistence of high and extreme categories serves as a reminder for residents and visitors alike to remain vigilant and practice effective sun protection. For more detailed information, visit Atibaia UV Index.
UV Risk Categories
In September, Atibaia, Brazil, basks in a generous 302 hours of sunshine, continuing the trend of abundant daylight as the region transitions from winter to spring. This month stands out not only for its warmth but also for a notable consistency in sunshine hours, closely mirroring the sunny vibes felt during the peak winter months of July and August, which recorded 306 and 286 hours, respectively. As the days grow longer, September bridges the summer heat and autumn's embrace, offering residents and visitors alike a vibrant backdrop for outdoor activities. This delightful weather heralds the impending arrival of more vibrant months ahead, making Atibaia a prime destination for sunshine seekers.
In Atibaia, Brazil, September offers a pleasant transition into the latter part of the year, boasting a 54% chance of sunny weather. This marks a slight decline from the peak sunshine of 65% in July, but still reflects a favorable likelihood compared to the less sunny months that follow, such as October with only 21%. The month of September stands out as part of a trend showcasing gradually increasing sunshine from the earlier months, where January's mere 14% is notably overshadowed by the more promising conditions of late winter and early spring. Enjoying a good balance of sun, September invites residents and visitors alike to bask in the brightness as the days begin to warm up before the rainy season sets in once again.
In Atibaia, Brazil, September marks a smooth transition in daylight duration, offering around 11 hours of sunlight. This month mirrors the previous one, August, where daylight also stretches to 11 hours, signaling a consistent balance as the seasons change. As the year unfolds, daylight begins to gradually increase again, peaking in January and November with 13 hours of sunshine each. Notably, the year demonstrates a gradual ebbing of daylight from the vibrant summer months, peaking in January, down to the shorter days of May through July, before gradually ascending once more. Thus, September serves as a pivotal point where the daylight days linger, capturing the essence of springtime in Brazil.
As September unfolds in Atibaia, Brazil, the winds begin to pick up, presenting an invigorating shift in the atmosphere. With an average wind speed of 2.9 m/s (7 mph), September marks a noticeable increase compared to the more tranquil summer months, where winds hovered around 2.2-2.5 m/s (5-6 mph). This gentle rise signifies a transition into more dynamic weather patterns, continuing into October, which reaches a peak of 3.2 m/s (7 mph). Such conditions not only invigorate the landscape but also highlight September as a month where the breezes flirt with the promise of change, paving the way for the invigorating winds of fall.
Weather in Atibaia varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Atibaia, focusing on differences in temperature, rainfall, humidity, and UV levels.
In comparing the weather of September and January, September typically offers milder temperatures with a minimum of 9°C (48°F) and an average of 21°C (69°F), reaching a maximum of 34°C (93°F). With lower precipitation levels of 44 mm (1.7 in) over just six days, September enjoys relatively moderate humidity at 58%.
In contrast, January brings warmer conditions with a minimum of 13°C (55°F) and an average temperature of 23°C (73°F), peaking at 33°C (91°F). However, it also experiences significantly higher rainfall, totaling 184 mm (7.2 in) spread over 18 days, leading to a much higher humidity level at 88%. For a detailed look at the weather specifics, you can check Atibaia weather in January.
September and February present distinctly different weather patterns. In September, temperatures range from a comfortable minimum of 9°C (48°F) to an average of 21°C (69°F) and a maximum of 34°C (93°F). The month sees relatively low precipitation at 44 mm (1.7 in) over just 6 days, accompanied by a moderate humidity level of 58%. In contrast, February experiences warmer conditions, with a minimum temperature of 15°C (59°F), an average of 22°C (72°F), and the same maximum of 34°C (93°F). However, February is significantly wetter, receiving 170 mm (6.7 in) of rainfall over 15 days and a high humidity of 88%. For more detailed information, you can check Atibaia weather in February.
September and March offer distinct weather experiences. In September, temperatures range from a minimum of 9°C (48°F) to a maximum of 34°C (93°F), with an average of 21°C (69°F). The month sees relatively mild precipitation of 44 mm (1.7 in) over just 6 days, accompanied by a moderate humidity level of 58%. In contrast, March features a slightly warmer average temperature of 22°C (72°F) with a minimum of 13°C (55°F) and a maximum reaching 32°C (89°F). However, it is also significantly wetter, with 128 mm (5.1 in) of rain over 15 days, coupled with heightened humidity of 87%. For more details, you can check Atibaia weather in March.
Comparing September and April weather, September tends to have slightly warmer temperatures, with averages reaching up to 21°C (69°F) and maximums of 34°C (93°F). In contrast, April features a milder average temperature of 20°C (68°F) and maximums of 30°C (86°F). Precipitation levels are higher in April, with a total of 52 mm (2.0 in) over 8 days, compared to September's 44 mm (1.7 in) across 6 days. Additionally, April has a notably higher humidity level at 84%, compared to September's 58%. For more detailed insights, you can check Atibaia weather in April.
In September, the weather typically sees a minimum temperature of 9°C (48°F) and can rise to a maximum of 34°C (93°F), averaging around 21°C (69°F). With an average precipitation of 44 mm (1.7 in) spread over 6 days, the humidity hovers around 58%. In contrast, May features cooler temperatures, with a range from a chilly 4°C (40°F) to a warmer 29°C (84°F) and an average of 18°C (64°F). Although May also receives 44 mm (1.7 in) of rainfall, it does so over just 5 days, accompanied by a higher humidity level of 79%. For more details on May weather in Atibaia, you can visit Atibaia weather in May.
In comparing the weather between September and June, September tends to be warmer overall, with average temperatures reaching around 21°C (69°F) and maximums peaking at 34°C (93°F). In contrast, June is cooler, with average temperatures of 17°C (63°F) and maximums at 27°C (82°F). Additionally, September experiences slightly more rainfall, totaling 44 mm (1.7 in) over about 6 days, compared to June's 31 mm (1.2 in) spread across 5 days. Humidity levels are lower in September at 58%, whereas June is notably more humid, with a humidity level of 77%. For more detailed insights on June weather, you can check Atibaia weather in June.
Comparing the weather in September and July reveals notable differences in temperature and precipitation. September typically experiences a wider temperature range, with minimums reaching 9°C (48°F) and maximums soaring to 34°C (93°F), averaging around 21°C (69°F). In contrast, July has cooler temperatures, with a minimum of 1°C (34°F) and a maximum of 28°C (83°F), averaging 16°C (61°F). Additionally, September sees more rainfall, totaling 44 mm (1.7 in) over six days, while July is much drier, receiving only 14 mm (0.6 in) across just one day. The humidity is also higher in July at 72%, compared to September’s 58%. For a closer look at the conditions in July, you can check out Atibaia weather in July.
In comparing the weather of September and August, September experiences a notable rise in average temperatures, with lows of 9°C (48°F) and highs reaching up to 34°C (93°F), contrasting with August's cooler range of 5°C (40°F) to 30°C (87°F). Additionally, while September averages 44 mm (1.7 in) of precipitation over 6 days, August has slightly higher rainfall at 50 mm (2.0 in) across 5 days. Humidity is also lower in September at 58%, compared to August's 65%. For more details on August weather specifically, visit Atibaia weather in August.
In September, the weather is characterized by a wider temperature range, with minimums around 9°C (48°F) and maximums reaching up to 34°C (93°F), contributing to an average temperature of 21°C (69°F). The month sees moderate precipitation of 44 mm (1.7 in) over just 6 days, alongside a humidity level of 58%. In contrast, October experiences slightly warmer minimum temperatures at 11°C (52°F) and higher maximums peaking at 35°C (96°F), maintaining the average temperature at 21°C (70°F). However, October is considerably wetter, with precipitation rising to 124 mm (4.9 in) spread over 14 days and a lower humidity level of 50%. For a detailed look at what to expect, visit Atibaia weather in October.
September and November weather show some key differences, particularly in precipitation and humidity. In September, temperatures range from a minimum of 9°C (48°F) to a maximum of 34°C (93°F), with an average of 21°C (69°F) and only 44 mm (1.7 in) of rainfall over 6 days. In contrast, November’s temperatures are slightly higher, with a minimum of 10°C (51°F) and a maximum of 35°C (95°F), maintaining an average of 21°C (70°F). However, November is significantly wetter, receiving 136 mm (5.4 in) of rain over 13 days, and the humidity rises to 75%. For more detailed information, check Atibaia weather in November.
In September, the weather features a range of temperatures, with a minimum of 9°C (48°F) and a maximum of 34°C (93°F), averaging at 21°C (69°F). This month experiences relatively low precipitation of 44 mm (1.7 in) over about 6 days, accompanied by a humidity level of 58%. In contrast, December sees a slight increase in minimum temperatures at 12°C (54°F) and similar maximums at 33°C (91°F), with an average temperature of 22°C (72°F). However, this month is significantly wetter, receiving 153 mm (6.0 in) of rain over 20 days, resulting in a higher humidity of 80%. For more detailed insights, visit Atibaia weather in December.
As September rolls into Atibaia, the weather experiences a delightful transition that sets the stage for a vibrant spring. With pleasant average temperatures hovering around 21°C (69°F), the early days might still feel a bit cool, especially during nights when temperatures can dip to a brisk 9°C (48°F). While the maximum temperatures can reach up to 34°C (93°F), the month is characterized by a moderate increase in warmth and humidity levels dancing around 58%. Although rain isn't overly frequent, with about 6 days of precipitation totaling 44 mm (1.7 in), this increased moisture tends to invigorate the lush greenery of the region, making it an appealing time for outdoor adventures. This blend of warmth and occasional rain marks September as a unique period in Atibaia's climate, distinct from the hotter, drier months that follow. To learn more about the diverse weather patterns throughout the year, check out Atibaia Climate.