Last updated: August 21, 2025
September in Ilhabela, Brazil brings a delightful blend of warm temperatures and refreshing humidity. With maximum temperatures reaching up to 30°C (86°F) and an average of 21°C (70°F), the climate is perfect for outdoor adventures. Though the island experiences about 101 mm (4.0 in) of precipitation over 12 days, the lush greenery that flourishes from these showers only enhances its charm. Humidity hovers around 58%, ensuring the air remains pleasantly comfortable as visitors explore the scenic beauty of this tropical paradise.
In September, Ilhabela begins to transition from the cooler winter months, welcoming more warmth with an average temperature of 21°C (70°F). This month sees minimums around 16°C (61°F) and maximums reaching up to 30°C (86°F), creating a pleasant climate ideal for outdoor activities and beach outings. As the island shakes off the chill of August, visitors can expect increasingly inviting days, making it a perfect time to explore its stunning landscapes and vibrant culture before the peak tourist season kicks in. The gradual rise in temperatures signals the arrival of spring in Brazil, presenting an ideal climate to experience Ilhabela's breathtaking natural beauty.
In September, Ilhabela experiences a shift in rainfall patterns, with precipitation measuring 101 mm (4.0 in) across approximately 12 days. This marks a decrease compared to the wetter months of January through March, where rainfall exceeded 196 mm (7.7 in), signaling a gradual transition away from the peak of the rainy season. Although September sees less rain than preceding months, it still holds significant moisture, contributing to the lush, vibrant landscapes that define the region. As the month progresses, the anticipation of more rain in October—often bringing 160 mm (6.3 in) of precipitation over 19 days—hints at the cyclical nature of Ilhabela's climate, ensuring that the lush beauty of the island continues to thrive.
As September rolls into Ilhabela, Brazil, the humidity begins to show a notable decline, reaching a comfortable 58%. This marks a significant drop from the steamy heights of 88% experienced in January and February, reflecting a transition towards drier conditions. Throughout the year, humidity levels gradually decrease, peaking in the early months and bottoming out in October at 50%. This pattern of fluctuating moisture resonates with the island’s unique climate, where the lush landscapes thrive under the high humidity of the first half of the year, ultimately giving way to a more refreshing atmosphere as spring approaches. By September, the air feels lighter, enhancing the allure of Ilhabela’s beautiful beaches and vibrant nature, inviting both locals and travelers to enjoy the island’s charm.
In September, Ilhabela experiences a UV Index of 11, categorizing it as extreme, which means a brief exposure of just 10 minutes can lead to skin damage. This month marks a transition from the intense summer peaks of January and February, where the UV Index reaches a staggering 15, to a slightly lower but still severe level. Notably, the UV Index remains consistent through September and October, hovering between 11 and 13. As it approaches the hotter months, awareness remains vital for sun safety. Visitors should always prepare for high UV levels and protect their skin when enjoying the beautiful beaches of Ilhabela. For more detailed information, check out the Ilhabela UV Index.
UV Risk Categories
September in Ilhabela, Brazil, offers a delightful transition as the sun graces the island with a commendable 288 hours of sunshine. This marks a slight decrease from the sun-drenched highs of March and November, yet it remains on par with the vibrant July and October months. As winter fades, the consistent sunshine hints at the approaching warmth of summer, where the sun reaches its peak in December with a glorious 324 hours. Visitors in September can bask in the beautiful balance of sunshine, enjoying outdoor adventures and scenic views, while feeling the lingering warmth of the sunny months just behind them. With every sunrise, the island reveals its charm, beckoning travelers to revel in this perfect blend of light and warmth.
In September, Ilhabela, Brazil, typically experiences a 40% chance of sunny weather, marking a transition from the peak winter months into the more vibrant spring season. This statistic reflects a notable dip compared to the sunniest period of July, which boasts a impressive 62% chance of sun. However, September is not without its charms—while it may not be the sunniest month, it still holds its own amidst the balance of the year. Following the sunnier August, with a 56% chance, September hints at the impending warmth of October, where the likelihood of sun drops again to 21%. The variations throughout the year weave a rich tapestry of Ilhabela's climatic trends, inviting visitors to enjoy its beauty even when the sun isn't shining at full strength.
As September unfolds in Ilhabela, Brazil, residents and visitors alike enjoy approximately 11 hours of daylight, marking a pleasant transition as the days start to lengthen again. Following the gradual decrease in daylight throughout the winter months, September signals a shift from the shorter days of mid-year back towards longer sunlight, paving the way for the vibrant months ahead. As the year progresses, the amount of daylight will continue to increase, with October bringing another hour of light. This rhythm of changing daylight not only enhances the island's natural beauty but also invites more opportunities for outdoor activities as the inviting warmth of spring approaches.
As September rolls in, Ilhabela, Brazil experiences a notable shift in its wind patterns, with an average wind speed of 4.7 m/s (11 mph), making it one of the breeziest months of the year. This increase follows a summer of relatively gentle breezes, peaking just slightly higher than August's 4.6 m/s (10 mph). The winds begin to pick up momentum as the year progresses, and by October, they soar to 5.8 m/s (13 mph), ushering in a dynamic transition toward the more vigorous winds of late spring. Overall, September stands out not only for its inviting warmth but also for the invigorating gusts that whisper through the lush landscapes of Ilhabela, setting the stage for thrilling outdoor adventures.
Weather in Ilhabela varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Ilhabela, focusing on differences in temperature, rainfall, humidity, and UV levels.
In September, the weather is marked by a comfortable temperature range with a minimum of 16°C (61°F) and a maximum of 30°C (86°F), averaging around 21°C (70°F). The month experiences moderate precipitation of 101 mm (4.0 in) over 12 days, accompanied by a humidity level of 58%. In contrast, January sees warmer temperatures, with the minimum rising to 22°C (72°F) and a maximum of 31°C (89°F), averaging 26°C (79°F). The rainfall increases slightly to 138 mm (5.5 in) over 13 days, and the humidity is much higher at 88%. This shift from September to January highlights not only warmer temperatures but also a more humid and wetter climate during the peak of summer. For more details, you can check Ilhabela weather in January.
September and February present distinct weather contrasts. In September, temperatures range from a minimum of 16°C (61°F) to a maximum of 30°C (86°F), with an average of 21°C (70°F). The month experiences a total precipitation of 101 mm (4.0 in), spread over 12 days, with a moderate humidity level of 58%. In contrast, February is warmer, showcasing minimum temperatures of 21°C (71°F) and maximums reaching 32°C (90°F), with an average of 25°C (78°F). However, it also brings more rain, accumulating 214 mm (8.4 in) over 16 days, along with higher humidity levels at 88%. For more detailed insights, check out Ilhabela weather in February.
September and March showcase contrasting weather patterns. In September, the temperatures range from a minimum of 16°C (61°F) to a maximum of 30°C (86°F), with an average temperature of 21°C (70°F). Precipitation is moderate, totaling 101 mm (4.0 in) over about 12 days, and humidity sits at 58%. In contrast, March experiences milder temperatures, with a minimum of 21°C (70°F) and reaching up to 30°C (87°F) on average. However, it brings significantly more rainfall, totaling 196 mm (7.7 in) across about 15 days, with humidity rising to a high of 87%. For more details on March weather, you can visit Ilhabela weather in March.
When comparing the weather in September and April, both months showcase warm temperatures, with September exhibiting a minimum of 16°C (61°F) and an average of 21°C (70°F), while April starts slightly warmer with a minimum of 19°C (67°F) and an average of 23°C (74°F). Both months share the same maximum temperature of 30°C (86°F), but April typically experiences higher humidity at 84% compared to September’s 58%. Precipitation also varies, with April receiving more rainfall at 122 mm (4.8 in) over 14 days, whereas September has 101 mm (4.0 in) over 12 days. For more detailed information, check out Ilhabela weather in April.
When comparing the weather in September and May, we see some interesting nuances. September offers a warm temperature range, with a minimum of 16°C and a maximum of 30°C, resulting in an average of 21°C. The month experiences a moderate level of precipitation at 101 mm over 12 days, accompanied by a comfortable humidity level of 58%.
In contrast, May presents a slightly warmer average of 22°C, with a similar minimum of 16°C and a maximum of 28°C. However, it also sees increased rainfall, totaling 133 mm over the same number of days, and higher humidity at 79%. This makes May feel a bit more humid and potentially rainier compared to the drier September.
For a more detailed overview of the weather in May, you can visit Ilhabela weather in May.
In comparing the weather between September and June, both months showcase similar average temperatures, hovering around 21°C (70°F to 71°F). However, September experiences slightly warmer maximum temperatures of up to 30°C (86°F), while June's highs reach 28°C (83°F). Precipitation levels are notably close, with September receiving 101 mm (4.0 in) and June slightly wetter at 112 mm (4.4 in), both over 12 days. A significant difference is observed in humidity, as June is more humid at 77%, compared to September's 58%. For a closer look at June weather patterns, you can visit Ilhabela weather in June.
When comparing the weather in September and July, September tends to be slightly warmer with average temperatures reaching 21°C (70°F), while July averages at 20°C (69°F). In September, the maximum temperature can climb to 30°C (86°F), compared to July's maximum of 29°C (84°F). Additionally, September experiences more rainfall, with 101 mm (4.0 in) over 12 days, whereas July records less precipitation at 68 mm (2.7 in) across just 6 days. Interestingly, July has a higher humidity level at 72%, in contrast to September's 58%. For more specific details, you can check Ilhabela weather in July.
September generally offers slightly warmer temperatures compared to August, with average highs reaching 30°C (86°F) versus August's high of 28°C (83°F). The minimum temperatures are also comparable, with September starting at 16°C (61°F) and August at 15°C (60°F). However, September experiences slightly less precipitation, recording 101 mm (4.0 in) over 12 days, compared to August's 126 mm (5.0 in) over 13 days. Additionally, humidity levels decrease from 65% in August to 58% in September. For more detailed information, you can visit Ilhabela weather in August.
In September, the weather features a minimum temperature of 16°C (61°F) and averages around 21°C (70°F), with highs reaching up to 30°C (86°F). The month experiences about 101 mm (4.0 in) of precipitation over 12 days, with a humidity level of 58%. In contrast, October sees slightly warmer temperatures, with a minimum of 17°C (63°F) and an average of 22°C (71°F). Maximum temperatures can rise to 32°C (91°F), but the month also brings a significant increase in rainfall to about 160 mm (6.3 in) across 19 days, while humidity drops to 50%. For more details, you can check out the Ilhabela weather in October.
In comparing the weather between September and November, September tends to be slightly warmer, with average temperatures ranging from a minimum of 16°C (61°F) to a maximum of 30°C (86°F), while November features a minimum of 18°C (65°F) and a maximum of 29°C (84°F). November, however, is marked by higher humidity at 75% compared to September's 58%. Additionally, November experiences increased precipitation, with 171 mm (6.7 in) over 17 days compared to September's 101 mm (4.0 in) over 12 days. For more details, you can check out Ilhabela weather in November.
In September, the weather is generally warm, with temperatures ranging from a minimum of 16°C (61°F) to a maximum of 30°C (86°F), and an average temperature of 21°C (70°F). The month sees a total precipitation of 101 mm (4.0 in) over 12 rainy days, along with a humidity level of 58%. In contrast, December experiences slightly warmer temperatures, with a minimum of 19°C (67°F), an average of 24°C (75°F), and a maximum of 29°C (85°F). The precipitation increases to 144 mm (5.7 in) over 14 days, and the humidity rises significantly to 80%. For more specifics on the December weather, you can check Ilhabela weather in December.
As September unfolds in Ilhabela, it brings a delightful transition from the cooler winter months to the warmer days of spring. Visitors can expect pleasant temperatures with a harmonious blend of warm days and mild nights, creating an inviting atmosphere for outdoor activities. While occasional rainfall may occur, with around half the month seeing a few wet days, the overall humidity is manageable, making the lush landscapes even more vibrant. This unique September weather stands in contrast to both the cooler winter and the more humid summer months, offering a fantastic opportunity to explore Ilhabela's natural beauty. To learn more about the annual climate patterns, visit Ilhabela Climate.