Last updated: August 21, 2025
September in Florianopolis, Brazil, ushers in the start of spring, offering a delightful climate for locals and visitors alike. With maximum temperatures reaching up to 28°C (82°F) and an average of 19°C (67°F), the weather is pleasantly warm during the day, while cooler nights see temperatures dipping to a minimum of 12°C (54°F). However, be prepared for some rain, as the month sees an average precipitation of 88 mm (3.5 in) over 12 days. Coupled with a humidity level of 82%, September provides a refreshing, vibrant atmosphere perfect for exploring the natural beauty and cultural richness of this stunning coastal city.
As September unfolds in Florianopolis, Brazil, temperatures begin to transition from the chill of winter towards the warmth of spring. The month welcomes a minimum temperature of 12°C (54°F), providing a refreshing start, while the average climbs to 19°C (67°F), signaling a shift in the season. With highs reaching up to 28°C (82°F), the island showcases a pleasant blend of cool mornings and sunny afternoons, perfect for enjoying its stunning beaches and outdoor activities. This gradual warmth hints at the vibrant days ahead, making September an ideal time for visitors to experience the emerging beauty of Florianopolis as it shakes off the last remnants of winter.
In September, Florianopolis experiences a moderate shift in precipitation, receiving an average of 88 mm (3.5 in) over 12 days. This marks an increase from the drier months of July and August, where rainfall was notably lower at 46 mm and 63 mm, respectively. As the city transitions into spring, September’s rain hints at a warming trend, paving the way for the more abundant rains of October, which usually sees 130 mm (5.1 in). The uptick in precipitation not only rejuvenates the lush vegetation but also sets the scene for the vibrant energy of the upcoming months, making it a delightful time to enjoy the island's natural beauty.
In September, Florianopolis experiences a humidity level of 82%, which is slightly lower than the preceding months but still reflects a warm coastal climate. As the city transitions from winter into spring, there's a notable rise in humidity that aligns with the overall trend observed throughout the year. The rates begin to pick up again after a gradual decline from the peak humidity in the summer months, highlighting a cycle where higher humidity is typical from late spring through early summer, peaking at 88% in December. This consistent humidity pattern underscores the region's tropical feel, making it an ideal destination for those seeking a vibrant and lush environment.
In September, Florianopolis experiences a very high UV Index of 10, indicating that sun safety measures should still be a priority as the days begin to warm up. With a burn time of just 15 minutes, it’s crucial for outdoor enthusiasts to take precautions against overexposure. This month’s UV levels mark a slight increase from the cooler months of June and July, which were at a moderate 5, yet remain lower than the extreme values seen in the summer months. As the transition into spring unfolds, residents and visitors alike should remain vigilant to protect their skin during this seasonal shift. For more detailed insights on UV levels throughout the year, visit Florianopolis UV Index.
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September in Florianopolis boasts 244 hours of sunshine, setting the stage for a delightful transition into spring. Although the sunlight begins to wane slightly compared to the vibrant summer months, this early hint of warmth nurtures the island's lush landscapes and invigorates outdoor activities. As daylight hours briefly dip from August’s 264 hours, they still remain plentiful, paving the way for the sun-soaked days of October and the striking peak of summer in December, which offers an impressive 342 hours of sunshine. Thus, September serves as a charming prelude to a season filled with sunny adventures and tropical allure.
In Florianopolis, Brazil, September brings a moderate 26% chance of sunny weather, marking it as one of the less favorable months for sun-seekers. As the winter months transition into spring, the likelihood of sunshine increases notably in the subsequent months, with October dipping to 18% before rising dramatically in November and December. This trend reflects a gradual return to sunnier days following a winter marked by higher chances of cloud cover, particularly in the preceding months of July and August, where sunniness peaked at 57% and 33%, respectively. As September arrives, visitors can expect a mix of beautiful days and mild cloudiness, hinting at the brighter days just around the corner.
In Florianopolis, Brazil, September marks a transition as the days gradually lengthen, offering about 11 hours of daylight. This period follows the equal light of August and leads into the brighter months of October and November, where daylight extends back to a full 12 and 13 hours, respectively. The seasonal shift from the shorter days of winter showcases the region's vibrant cycle, where each month contributes to a rhythm of sunshine that peaks during the summer. As September unfolds, residents and visitors alike are invited to embrace the gentle increase in daylight, heralding the warmer days ahead.
As September arrives in Florianopolis, Brazil, the winds pick up with an average speed of 3.6 m/s (8 mph), echoing January's breezy embrace. This month marks a noticeable shift in the wind patterns, as the gusts transition from the calmer days of winter to a more invigorated atmosphere, building momentum towards the stronger October winds at 4.0 m/s. The consistency of September's winds, coupled with a slight uptick in speed compared to the late winter and early spring months, sets the tone for the lively energy that encapsulates this vibrant coastal city. Embracing the refreshing sea breeze, locals and visitors alike find September to be a delightful precursor to the bustling summer season ahead.
Weather in Florianopolis varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Florianopolis, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January in Florianopolis offer contrasting weather experiences. In September, temperatures range from a mild 12°C (54°F) to a comfortable 28°C (82°F), with an average of 19°C (67°F). The month sees about 88 mm (3.5 in) of precipitation over 12 days, and humidity levels are around 82%. In contrast, January brings warmer conditions, with temperatures ranging from 20°C (68°F) to a scorching 36°C (96°F) and an average of 25°C (78°F). This month experiences more rainfall, totaling 178 mm (7.0 in) over 17 days, and slightly higher humidity at 86%. For a more detailed look at the January weather, visit Florianopolis weather in January.
In comparing the weather of September and February, it’s clear that February tends to be warmer and wetter. September experiences milder temperatures, with a minimum of 12°C (54°F) and a maximum of 28°C (82°F), while February sees higher temperatures ranging from a minimum of 18°C (64°F) to a maximum of 35°C (95°F). Additionally, February has more substantial rainfall, with 144 mm (5.7 in) across 16 days, compared to September's 88 mm (3.5 in) over 12 days. Both months maintain high humidity levels, around 82-83%. For more detailed insights, you can check Florianopolis weather in February.
September weather features a mild temperature range with a minimum of 12°C (54°F) and a maximum of 28°C (82°F), averaging around 19°C (67°F). The month sees moderate precipitation, totaling 88 mm (3.5 in) over about 12 rainy days, along with a humidity level of 82%. In contrast, March experiences warmer conditions, with minimum temperatures starting at 19°C (66°F) and peaking at 32°C (91°F), averaging 24°C (76°F). The precipitation increases to 133 mm (5.2 in) spread over 21 days, accompanied by slightly higher humidity at 85%. Overall, March is notably warmer and wetter than September. For more details, check the Florianopolis weather in March.
In comparing the weather of September and April, September tends to have a cooler temperature range, with average daily temperatures hovering around 19°C (67°F) compared to April's warmer average of 22°C (72°F). While both months experience significant humidity levels—82% in September and 85% in April—April generally has slightly higher maximum temperatures, reaching up to 31°C (87°F). Precipitation is similar in both months, with September receiving 88 mm (3.5 in) over 12 days and April having a touch less at 79 mm (3.1 in) across a few more rainy days. For more details, you can check Florianopolis weather in April.
When comparing the weather in September to that of May, we notice some subtle yet significant differences. September generally sees temperatures ranging from a minimum of 12°C (54°F) to a maximum of 28°C (82°F), with an average of 19°C (67°F). In contrast, May's temperatures are slightly cooler in the mornings but peak higher during the day, with a minimum of 10°C (51°F) and a maximum of 30°C (86°F), averaging around 20°C (68°F).
Precipitation is also more abundant in May, with a total of 107 mm (4.2 in) over 14 rainy days, compared to September's 88 mm (3.5 in) across 12 days of rain. Humidity levels are relatively high in both months, with September at 82% and May slightly higher at 86%. For those interested in more detailed information about May's climate, you can check Florianopolis weather in May.
When comparing the weather in September and June, both months exhibit relatively mild temperatures, but with distinct differences. In September, temperatures range from a minimum of 12°C (54°F) to a maximum of 28°C (82°F) with an average of 19°C (67°F), whereas June experiences slightly cooler conditions with a minimum of 8°C (47°F) and the same maximum of 28°C (83°F), averaging 18°C (65°F). Precipitation is higher in June, totaling 118 mm (4.6 in) over 11 days compared to September's 88 mm (3.5 in) over 12 days. Humidity levels are also similar, with September at 82% and June slightly higher at 85%. For more detailed insights on June weather, check Florianopolis weather in June.
In comparing the weather between September and July, September tends to be warmer with an average temperature of 19°C (67°F), compared to July's average of 17°C (62°F). Additionally, September experiences a higher maximum temperature of 28°C (82°F), matching July's peak but having a significantly milder minimum temperature of 12°C (54°F) versus July's 6°C (43°F). While September sees more rainfall, with 88 mm (3.5 in) spread over 12 days, July’s precipitation is lighter at 46 mm (1.8 in) over just 6 days. Humidity levels are slightly higher in September at 82%, compared to 80% in July. For more details on July weather, you can check Florianopolis weather in July.
In comparing the weather of September and August, September presents slightly warmer conditions, with average temperatures ranging from a minimum of 12°C (54°F) to a maximum of 28°C (82°F), compared to August's temperatures of 8°C (46°F) to 27°C (80°F). September also experiences more rainfall, with precipitation totaling 88 mm (3.5 in) over 12 days, while August sees 63 mm (2.5 in) over 9 days. Additionally, humidity levels are slightly higher in September at 82%, versus 79% in August. For a closer look, you can check out the detailed forecast in Florianopolis weather in August.
In comparing the weather between September and October, October tends to be warmer with average temperatures rising from 19°C (67°F) in September to 21°C (69°F) in October. The maximum temperature also increases, reaching up to 31°C (88°F) in October compared to September's 28°C (82°F). However, October experiences significantly more precipitation, with 130 mm (5.1 in) over 16 days compared to September's 88 mm (3.5 in) over 12 days. Both months maintain a high humidity level of 82%. For more detailed information, you can check Florianopolis weather in October.
In September, the weather tends to be mild, with average temperatures ranging from a minimum of 12°C (54°F) to a maximum of 28°C (82°F), and an average humidity of 82%. The month also experiences about 88 mm (3.5 in) of precipitation over approximately 12 days. In contrast, November sees slightly warmer conditions, with a minimum temperature of 14°C (57°F) and a maximum reaching 32°C (90°F), leading to an average of 22°C (72°F). Rainfall increases to 101 mm (4.0 in) spread across about 16 days, accompanied by slightly higher humidity at 86%. For a more detailed comparison of the weather in November, you can check Florianopolis weather in November.
In September, the weather in Florianopolis is relatively mild, with temperatures ranging from a minimum of 12°C (54°F) to a maximum of 28°C (82°F) and an average of 19°C (67°F). The month sees about 88 mm (3.5 in) of precipitation spread over 12 days, accompanied by a humidity level of 82%. In contrast, December brings warmer conditions, with temperatures ranging from a minimum of 16°C (61°F) to a maximum of 33°C (92°F) and an average of 24°C (75°F). However, December is also wetter, with a total precipitation of 140 mm (5.5 in) over 16 days and slightly higher humidity at 88%. To learn more about the weather specifics for December, you can refer to Florianopolis weather in December.
As September unfolds in Florianopolis, the weather begins to transition from the cooler winter months, offering a delightful blend of warmth and humidity. With temperatures rising and an average that hovers around a comfortable 19°C, visitors can enjoy the beauty of the island as nature awakens. However, the month is not without its share of rain, experiencing an uptick in precipitation compared to the previous winter months—perfect for nurturing the vibrant landscapes. The humidity levels also start to climb, adding a tropical feel to the air. For a deeper understanding of what to expect throughout the year, explore the full picture in Florianopolis Climate.