Last updated: August 21, 2025
Experience the vibrant climate of São Sebastião, Brazil in September, where the weather strikes a delightful balance between warmth and moisture. With maximum temperatures reaching a sizzling 33°C (91°F) and an average of 24°C (76°F), this coastal paradise welcomes visitors with inviting sunshine. However, don't forget your umbrella; September sees about 52 mm (2.1 in) of rainfall spread over 18 days, creating a lush, tropical environment. The high humidity at 79% adds to the refreshing atmosphere, making it an ideal time for both locals and travelers to enjoy the stunning beaches and vibrant culture of this charming destination.
In September, Sao Sebastiao, Brazil, experiences a delightful transition as the temperatures begin to cool slightly from the peak summer heat. The minimum temperature sits at a comfortable 19°C (66°F), while the average temperature hovers around 24°C (76°F), offering a pleasant respite from the sweltering months before. With a maximum temperature reaching 33°C (91°F), this month strikes a harmonious balance, where warm days still invite beach outings and outdoor adventures without the extremes. As the seasons shift, September in Sao Sebastiao provides a wonderful opportunity to enjoy the outdoors amid more moderate and enjoyable climate conditions.
In September, São Sebastião experiences a moderate precipitation total of 52 mm (2.1 in), which marks a noticeable decline from the wetter months of May and June. This month sees around 18 rainy days, reflecting a shift as the region transitions from its peak rainy season. While the rainfall is less intense compared to earlier months, it still provides ample moisture, setting the stage for the lush landscapes characteristic of this coastal region. As October approaches, the precipitation further diminishes, hinting at a drying trend that characterizes the latter part of the year. Overall, September offers a blend of lingering rain and the anticipation of drier days ahead, making it a unique transitional period for São Sebastião.
September marks a subtle shift in humidity levels in São Sebastião, Brazil, as the average dips to 79%, reflecting the onset of the drier season. This decline follows a gradual decrease from the peak humidity of 86% observed in April and May, showcasing a seasonal trend where the air becomes less moist as the year progresses towards the drier months of October through December. Interestingly, September's humidity is relatively close to the 80% recorded in August, maintaining a comfortable atmosphere before the late-year drop to 77% in October. Overall, the changing humidity levels not only highlight São Sebastião's tropical climate but also set the stage for the upcoming milder conditions that residents and visitors can enjoy.
In September, the UV Index in Sao Sebastiao reaches a striking 13, categorizing it as extreme and ensuring a burn time of only 10 minutes for unprotected skin. This month follows a summer trend of consistently high indexes, where earlier months like January through April also reported an unyielding 14. As the region transitions into spring, a slight dip in intensity is observed in June and July, with a drop to 10; however, the UV levels bounce back quickly as August peaks at 12. September remains a reminder of the ongoing need for sun protection as the UV Index is poised to surge again in the following months. For more details on Sao Sebastiao's UV levels, check out Sao Sebastiao UV Index.
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September in São Sebastião, Brazil, is a delightful prelude to the vibrant sunshine of spring. With 333 hours of glorious sunlight, this month marks a subtle uptick compared to its August predecessor, offering a gentle transition from the cooler winter months. As the year progresses, it becomes clear that daylight is on the rise, leading to the peak sunshine in October, which boasts an impressive 355 hours. This upward trend from September showcases a gradual return to long, sun-drenched days, paving the way for the blossoming beauty of the Brazilian coastline as summer approaches. The consistent increase in sunshine hours not only brightens the landscape but also energizes the spirits of both locals and visitors alike, making September a truly splendid time to soak up the sun in this picturesque locale.
September in São Sebastião, Brazil, welcomes a notable increase in sunny days, presenting a 47% chance of sunshine—the highest for this month in the latter part of the year. As we transition from the winter months, which see a gradual rise in sunshine with July and August at 42% and 41% respectively, September's 47% highlights a shift towards more favorable beach weather. This trend continues into October, where the likelihood remains strong at 46%, making this time a delightful period for outdoor activities and basking in the sun. With such promising prospects, September is an increasingly appealing choice for those looking to enjoy the warm Brazilian coast.
As the seasons transition in Sao Sebastiao, Brazil, September marks a delightful return to longer days, with daylight extending to 12 hours. This aligns with the consistent daylight pattern observed from January through March, where the sun graces the skies for an equal duration. However, as the year progresses into the cooler months, daylight dips to 11 hours from April to August, offering a brief respite from the intense sunlight. Yet, September serves as a reminder of summer's lingering warmth, seamlessly nudging daylight back to the vibrant 12-hour mark, a rhythm that continues through October and November. This fluctuation beautifully encapsulates the region's tropical climate, where the balance of light and shadow plays a vital role in shaping its enchanting landscape and lifestyle.
As September unfolds in Sao Sebastiao, Brazil, the gentle breezes begin to find their rhythm, with average wind speeds reaching 3.1 m/s (7 mph). This transitional month marks a subtle increase from the calmer days of mid-year, where winds dipped to around 2.3 m/s (5 mph) in June. The trend continues to rise through the fall months, peaking at 3.7 m/s (8 mph) by November and December. Overall, as the season shifts, September serves as a delightful prelude to the breezier days ahead, inviting both locals and travelers to bask in the refreshing winds that dance through this coastal paradise.
Weather in Sao Sebastiao varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Sao Sebastiao, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January in Sao Sebastiao present distinct weather patterns. In September, temperatures range from a minimum of 19°C (66°F) to a maximum of 33°C (91°F), averaging around 24°C (76°F). The month experiences relatively high humidity at 79% and receives about 52 mm (2.1 in) of precipitation over 18 days. In contrast, January tends to be warmer, with minimum temperatures of 22°C (71°F) and maximums reaching up to 36°C (96°F), averaging 27°C (81°F). The precipitation is lighter, totaling 35 mm (1.4 in) across 12 days, while maintaining a similar humidity level of 81%. For more details, you can check out Sao Sebastiao weather in January.
In comparing September and February weather, we notice that February typically experiences warmer temperatures, with a minimum of 23°C (73°F) and an average of 28°C (82°F), peaking at 35°C (95°F). In contrast, September starts off cooler, with a minimum of 19°C (66°F) and an average of 24°C (76°F), reaching a maximum of 33°C (91°F). While both months see significant humidity levels, September has a humidity rate of 79%, slightly lower than February's 82%. Regarding precipitation, September has a little more rain, with 52 mm (2.1 in) across 18 days compared to February's 49 mm (1.9 in) over 13 days. For more detailed insights into February weather, you can visit Sao Sebastiao weather in February.
In comparing the weather of September and March, we see notable differences in temperature and precipitation. September generally features milder temperatures, with minimums around 19°C (66°F), averaging 24°C (76°F), and maximums reaching 33°C (91°F). Humidity is moderate at 79%, with a total precipitation of 52 mm (2.1 in) spread over 18 days. In contrast, March tends to be warmer, with minimum temperatures starting at 22°C (72°F) and reaching an average of 27°C (81°F), peaking at a staggering 37°C (99°F). This month also records higher precipitation, accumulating 91 mm (3.6 in) over 17 days, accompanied by slightly increased humidity at 84%. For more details on the climatic conditions during this period, you can visit Sao Sebastiao weather in March.
In comparing the weather between September and April, we can observe some notable differences. September typically features a minimum temperature of 19°C (66°F) and an average of 24°C (76°F), with maximums reaching up to 33°C (91°F). The month experiences around 52 mm (2.1 in) of precipitation over 18 days and maintains a humidity level of 79%. Conversely, April tends to be warmer with minimum temperatures at 21°C (71°F) and an average of 27°C (80°F), peaking at 34°C (93°F). It sees higher rainfall at 94 mm (3.7 in), spread across 20 days, along with a slightly elevated humidity of 86%. For more detailed information, you can visit Sao Sebastiao weather in April.
September and May present a contrast in weather conditions. While September boasts a minimum temperature of 19°C (66°F) and averages around 24°C (76°F), May sees slightly higher figures, with a minimum of 20°C (69°F) and an average of 25°C (78°F). Although both months can get quite warm, May has a maximum temperature of 34°C (94°F), making it marginally hotter than September's peak of 33°C (91°F). Precipitation also differs, with September receiving 52 mm (2.1 in) over 18 days, whereas May experiences a wetter climate with 105 mm (4.1 in) across 22 days. Additionally, May tends to be more humid, with levels reaching 86%, compared to September's 79%. For more details on the weather characteristics during this month, visit Sao Sebastiao weather in May.
When comparing the weather in September and June, both months share similar average temperatures, hovering around 24°C (76°F). However, September tends to be warmer overall, with maximum temperatures reaching up to 33°C (91°F), compared to June's peak of 30°C (87°F). In terms of precipitation, June experiences significantly more rainfall, totaling 109 mm (4.3 in) over 24 days, while September sees only 52 mm (2.1 in) over 18 days. Additionally, humidity levels are slightly higher in June at 83%, compared to September's 79%. For a more detailed look at June weather patterns, visit Sao Sebastiao weather in June.
In comparing the weather of September and July, we observe notable differences in temperature and precipitation. September typically experiences slightly higher temperatures, with a minimum of 19°C (66°F) and a maximum of 33°C (91°F), compared to July's range of 17°C (63°F) to 30°C (86°F). However, July sees more rainfall, totaling 108 mm (4.2 in) across 24 days, whereas September has only 52 mm (2.1 in) of precipitation over 18 days. Humidity levels are relatively similar, with July at 81% and September at 79%. For a more detailed look at July's weather, you can explore this link: Sao Sebastiao weather in July.
In comparing the weather of September and August, both months experience similar average temperatures, with September showing a slight increase in maximum temperatures at 33°C (91°F) compared to August's 31°C (88°F). However, September sees lower overall precipitation, recording 52 mm (2.1 in) over 18 days, while August has a higher total of 62 mm (2.5 in) across 20 days. Humidity levels are also quite close, with September at 79% and August at 80%. For a more detailed look at August weather, you can visit Sao Sebastiao weather in August.
September and October present a notable transition in weather patterns. September experiences slightly lower temperatures, with a minimum of 19°C and an average of 24°C, contrasted with October's warmer minimum of 21°C and an average of 26°C. Additionally, October sees higher maximum temperatures, peaking at 35°C compared to September's 33°C. Rainfall also differs significantly; September records 52 mm over 18 days, whereas October enjoys less precipitation with only 26 mm over 9 days, resulting in a marginally lower humidity level of 77%. For more details on the weather conditions, check Sao Sebastiao weather in October.
In comparing the weather of September and November, it's clear that November tends to be warmer overall. September has average temperatures ranging from a minimum of 19°C (66°F) to a maximum of 33°C (91°F), with an average of 24°C (76°F). In contrast, November features slightly higher temperatures, with a minimum of 21°C (71°F), an average of 27°C (81°F), and a maximum of 35°C (96°F). Additionally, November experiences significantly less precipitation, totaling 28 mm (1.1 in) over just 8 days, compared to September's 52 mm (2.1 in) over 18 days. Humidity levels remain relatively comparable, with September at 79% and November at 76%. For more detailed weather information, you can check Sao Sebastiao weather in November.
September weather tends to be warm, with average temperatures ranging from a minimum of 19°C (66°F) to a maximum of 33°C (91°F). The month experiences relatively high humidity at 79% and receives about 52 mm (2.1 in) of precipitation over 18 days. In contrast, December sees slightly higher temperatures with a minimum of 22°C (72°F) and a maximum of 36°C (97°F), while the humidity decreases slightly to 76%. Precipitation is also lower in December, totaling 28 mm (1.1 in) over just 8 days, making it a drier month overall. For more detailed insights on December weather, you can check Sao Sebastiao weather in December.
As September unfolds, Sao Sebastiao experiences a shift in weather that distinguishes it from the preceding and following months. The temperature remains comfortably warm, averaging around 24°C, with peaks occasionally reaching up to 33°C. However, this month is characterized by increased humidity, hovering around 79%, and a noticeable rise in rainfall, totaling approximately 52 mm over 18 days. This blend of warmth and moisture creates a vibrant, lush landscape, making it a unique time for both locals and visitors to appreciate the natural beauty of the region. For more insights on the weather throughout the year, visit Sao Sebastiao Climate.