Last updated: August 21, 2025
In September, Itanhaém, Brazil welcomes a delightful mix of temperatures, where daily highs reach a warm 31°C (88°F) and lows settle around 16°C (61°F). The average temperature rests comfortably at 20°C (69°F), providing a pleasant climate for outdoor activities. Despite the inviting warmth, precipitation plays a role this month, with 88 mm (3.5 in) of rainfall over approximately 13 days, contributing to the area's lush surroundings. Coupled with a humidity level of 78%, visitors should be prepared for a tropical experience, making September a unique time to explore the natural beauty of Itanhaém.
In September, Itanhaém, Brazil, begins to shake off the chill of winter, welcoming a pleasantly mild climate. The minimum temperature rises to a comfortable 16°C (61°F), while the average temperature hovers around 20°C (69°F)—a sign that spring is just around the corner. With a maximum of 31°C (88°F), the days are warmly inviting, encouraging outdoor activities and beach outings. This marks a gradual shift from the cooler July and August months, highlighting September as a transition period where temperatures steadily warm, creating a perfect backdrop for enjoying the natural beauty and vibrant culture of this stunning coastal town.
In September, Itanhaem experiences a notable decrease in precipitation compared to the wetter months earlier in the year. With 88 mm (3.5 in) of rainfall spread over 13 days, this month marks a shift towards drier conditions as the region transitions into the latter part of the year. While the rainfall is less than in the peak months of February and March, the moderation in precipitation allows for clearer skies and more favorable outdoor conditions, setting the stage for the renewed wetness anticipated in October. Overall, September serves as a brief respite from heavy rains, providing a balanced mix of sunny days interspersed with occasional showers.
As September rolls in Itanhaem, Brazil, the humidity remains relatively high at 78%, signaling the tail end of the humid season. Following a gradual decline from the peak levels in the earlier months—89% in January and 87% in February—September marks a noticeable shift as the air becomes slightly more comfortable, paralleling the trend seen in August. This decrease hints at the onset of the drier months ahead, as October sees a further drop to 76%. However, anticipating the upcoming months, a spike in humidity is expected again in November, jumping back up to 85%. This cyclical pattern illustrates Itanhaem's vibrant climate, where distinct wet and dry periods shape the seasonal experience.
In September, Itanhaém experiences a UV Index of 11, placing it back in the extreme exposure category. This indicates a heightened risk of harm from unprotected sun exposure, with a burn time of only 10 minutes. Notably, following the trend from the previous months, the UV Index is consistently high from January to March, peaks in the summer, and then tapers off in the cooler months of June and July before rising again in September. As the warmth of spring draws nearer, it’s crucial to remain vigilant with sun safety. To learn more about UV levels throughout the year, check out the detailed Itanhaem UV Index.
UV Risk Categories
September in Itanhaém, Brazil, offers a delightful transition from winter to spring, showcasing 263 hours of radiant sunshine. This month strikes a balance, providing slightly less sun than the peak summer months of December and November, which boast impressive totals of 328 and 301 hours, respectively. Following the cooler June, which bathes the region in only 234 hours, September signals a return to warmth, with daylight hours steadily increasing. As summer approaches, the sunshine trend solidifies, making Itanhaém a prime destination for those seeking vibrant beach days and outdoor adventures.
In Itanhaem, Brazil, the likelihood of sunny weather in September hovers around 30%, marking a slight dip compared to the sunnier days of mid-winter and summer months. While July boasts the highest chance of sunshine at 53%, September's weather begins to shift toward the wet season, offering fewer sunny skies as the year progresses. This trend continues into the fall, where October sees a further decrease to 18%. Overall, while September's sunshine is less than in the peak months, it still holds its charm for those seeking a balance of warmth and milder weather before the rainier season sets in.
As September rolls into Itanhaém, Brazil, daylight begins to settle into a comfortable 11-hour rhythm, mirroring the gradual transition seen since the brighter days of January. After a long stretch of shorter days from April through August, when daylight dipped to a minimum of 10 hours, the month signals a gentle shift towards more sunlight. Following September, the days will lengthen once again, leading into October with 12 hours of daylight and culminating in the return to 13 hours in November and December. This subtle ebb and flow of daylight not only marks the changing seasons but also invites residents and visitors alike to embrace the vibrant outdoor life that Itanhaém has to offer.
As September arrives in Itanhaém, Brazil, the coastal winds pick up, blowing at an average speed of 3.6 m/s (8 mph). This marks a continuation of the breezy conditions seen in August, which also boasted a similar wind speed. The transition into spring signals a notable increase from the quieter months of July and earlier, where winds were as gentle as 2.7 m/s (6 mph). In fact, September's winds set the stage for what lies ahead, with a seasonal uptick leading into October, where speeds are expected to reach 4.6 m/s (10 mph). This gentle yet invigorating breeze enhances the coastal charm of Itanhaém, inviting both locals and visitors to embrace the beauty of the ocean waves and the fresh, revitalizing air that defines the Brazilian coast during this vibrant time of year.
Weather in Itanhaem varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Itanhaem, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January present distinct differences in weather conditions. In September, the temperatures range from a minimum of 16°C (61°F) to a maximum of 31°C (88°F), with an average of 20°C (69°F). The month experiences 88 mm (3.5 in) of rainfall spread across 13 days, alongside a humidity level of 78%. Conversely, January sees warmer temperatures, with a minimum of 21°C (70°F) and a maximum reaching 32°C (89°F), resulting in an average of 26°C (79°F). Precipitation increases notably to 175 mm (6.9 in) over 20 days, and humidity also rises to 89%. For a closer look at January weather specifics, you can check Itanhaem weather in January.
When comparing September and February weather, it's notable that both months feature similar maximum temperatures of 31°C (88°F), but February tends to have higher average and minimum temperatures, with an average of 25°C (78°F) and a minimum of 21°C (70°F). In contrast, September has a cooler average of 20°C (69°F) and a minimum of 16°C (61°F). Precipitation is significantly higher in February, totaling 253 mm (10.0 in) over 21 days, compared to September's 88 mm (3.5 in) over 13 days. Humidity levels also rise slightly, with February at 87% compared to September's 78%. For more detailed information about February weather, you can check Itanhaem weather in February.
In comparing the weather between September and March, we find notable differences in both temperature and precipitation patterns. September features milder temperatures, with an average of 20°C (69°F) and maximums reaching 31°C (88°F). In contrast, March boasts slightly higher temperatures, averaging 25°C (77°F) and peaking at 32°C (90°F). However, March also experiences significantly more rainfall, with total precipitation reaching 236 mm (9.3 in) over 22 days, compared to September's 88 mm (3.5 in) across 13 days. Additionally, humidity is higher in March at 86%, compared to September's 78%. For more details on March weather, you can visit Itanhaem weather in March.
When comparing the weather in September and April, September typically experiences slightly cooler temperatures with averages around 20°C (69°F) and maximums reaching 31°C (88°F), while April is warmer, with an average temperature of 23°C (74°F) and a maximum of 30°C (87°F). However, April also sees significantly higher precipitation, averaging 154 mm (6.0 in) over 16 days, compared to September’s 88 mm (3.5 in) across 13 days. Additionally, humidity levels are a bit higher in April at 84%, compared to 78% in September. For more detailed insights on April weather, you can check Itanhaem weather in April.
In comparing the weather of September and May, we see that both months have similar minimum temperatures, with September at 16°C (61°F) and May slightly cooler at 15°C (58°F). However, September boasts a maximum temperature of 31°C (88°F), making it warmer overall with an average of 20°C (69°F), compared to May’s maximum of 28°C (84°F) and average of 21°C (71°F). When it comes to precipitation, May experiences more rain with 138 mm (5.4 in) compared to September's 88 mm (3.5 in), though both months have the same number of rainy days at 13. Additionally, May is slightly more humid at 84%, compared to September’s 78%. For more detailed information, you can visit Itanhaem weather in May.
When comparing the weather in September and June, both months exhibit mild temperatures, with September having an average of 20°C (68°F) and June slightly warmer at 21°C (70°F). However, September tends to reach higher maximum temperatures, peaking at 31°C (88°F), compared to June's maximum of 29°C (85°F). In terms of precipitation, June is wetter, receiving 135 mm (5.3 in) over 13 days, while September has less rainfall at 88 mm (3.5 in) during the same number of days. Humidity levels are also slightly higher in June at 82%, compared to 78% in September. For more details on the climate in June, you can check Itanhaem weather in June.
When comparing the weather in September and July, September generally offers warmer temperatures with an average of 20°C (69°F) compared to July's 19°C (67°F). Both months see similar conditions in terms of humidity, with September at 78% and July slightly higher at 80%. However, September experiences more rainfall, with 88 mm (3.5 in) spread over 13 days, while July has 76 mm (3.0 in) over just 8 days. This makes September a wetter month overall. For more detailed insights about weather conditions, you can check Itanhaem weather in July.
In comparing the weather of September and August, September tends to be slightly warmer, with average temperatures rising from 19°C (66°F) in August to 20°C (69°F) in September. The maximum temperature also increases, reaching up to 31°C (88°F) in September compared to 29°C (85°F) in August. However, September experiences slightly less precipitation, totaling 88 mm (3.5 in) over 13 days, while August sees a higher rainfall of 120 mm (4.7 in) over 12 days. Humidity levels remain consistent at 78% for both months. For more detailed information, you can check Itanhaem weather in August.
September and October exhibit notable differences in weather patterns. September presents a milder climate with average temperatures ranging from a minimum of 16°C (61°F) to a maximum of 31°C (88°F) and relatively lower precipitation, totaling 88 mm (3.5 in) over 13 days. In contrast, October sees a slight increase in average temperature, with min and max values ranging from 17°C (62°F) to 31°C (88°F), while experiencing significantly higher rainfall of 184 mm (7.2 in) spread over 20 days. Additionally, humidity levels remain relatively consistent, with September at 78% and October dropping slightly to 76%. For more detailed information on October weather, you can visit Itanhaem weather in October.
In September, the weather tends to be warm with an average temperature of 20°C (69°F), reaching highs of 31°C (88°F). It experiences relatively low precipitation of 88 mm (3.5 in) over approximately 13 days. In contrast, November sees a slight increase in the average temperature to 22°C (72°F), with highs reaching 27°C (82°F), but also brings increased rainfall of 134 mm (5.3 in) across 19 days. Additionally, humidity levels rise from 78% in September to 85% in November, making November feel a bit more humid. For a detailed look at the weather patterns, you can visit Itanhaem weather in November.
The weather in September and December presents notable differences, particularly in temperature and precipitation. September typically has a minimum temperature of 16°C (61°F) and an average of 20°C (69°F), while December sees warmer temperatures, with a minimum of 19°C (67°F) and an average of 24°C (75°F). In terms of rainfall, September experiences 88 mm (3.5 in) over 13 days, contrasting with December's significantly higher precipitation of 162 mm (6.4 in) over 19 days. Additionally, December has a slightly higher humidity level at 87% compared to September's 78%. For a more detailed look at December weather, you can visit Itanhaem weather in December.
As September unfolds in Itanhaém, the weather begins to shift, bringing a delightful balance between warmth and moisture. Unlike the sweltering heat of summer, this month offers a pleasant average temperature that makes outdoor activities enjoyable. However, with an increased number of rainy days, the lushness of the landscape thrives, giving way to a refreshing atmosphere. The humidity remains noticeable, adding a tropical touch, yet it is less oppressive compared to the peak months. Overall, September serves as a gentle transition, blending the tail end of winter's mildness with the burgeoning vitality of spring. For those looking to explore the region's unique climate patterns, check out Itanhaem Climate.