Last updated: August 21, 2025
September in Guaratuba, Brazil is characterized by mild temperatures and a humid climate. Daytime temperatures can reach a pleasant maximum of 28°C (82°F), while the average hovers around 20°C (68°F), making it an inviting time for outdoor activities. However, nights can be a bit cooler, dipping down to a minimum of 12°C (54°F). The region experiences about 91 mm (3.6 in) of rainfall spread across 14 days, contributing to a notable humidity level of 82%. This mix of warmth and moisture creates a vibrant atmosphere, perfect for enjoying the natural beauty of Guaratuba.
In September, Guaratuba welcomes a gentle transition into spring, characterized by pleasant temperatures that range from a minimum of 12°C (54°F) to a comfortable average of 20°C (68°F). This month sees the mercury peaking at 28°C (82°F), marking a notable shift from the cooler winter months. As the days grow longer and warmer, the climate becomes increasingly inviting, making September an ideal time for outdoor adventures and enjoying the region's natural beauty. The gradual increase in temperature helps set the stage for the more intense heat of the upcoming summer months, offering a perfect balance between warmth and comfort.
In September, Guaratuba experiences a noticeable shift in its precipitation patterns, with 91 mm (3.6 in) of rainfall spread across 14 days. This marks a slight increase compared to the drier months of July and August, which recorded only 32 mm (1.2 in) and 72 mm (2.8 in) respectively. As the region transitions from winter to spring, the rainfall begins to rise, hinting at the wetter months ahead. September's precipitation, while moderate, sets the stage for the more substantial downpours typical of the upcoming months, demonstrating a gradual return to Guaratuba's lush, tropical climate.
In September, Guaratuba experiences a noteworthy 82% humidity, slightly lower than the peak months of January and December, which boast humidity levels of 86% and 88% respectively. This month marks a transition as the humidity begins to ease after the more oppressive summer months, setting the stage for the drier conditions of late winter. The trend in Guaratuba shows a gradual decline from July’s 80% and August's 79%, highlighting a brief respite before October returns to a similar level of 82%. Overall, September serves as a transitional period in the region’s humid climate, bridging the gap between the cooler winter months and the expressive warmth of spring.
In Guaratuba, Brazil, the UV Index displays a striking pattern throughout the year, with September standing out at an index of 10, categorized as very high with a burn time of 15 minutes. As we transition from the intense summer months of January to March, where the UV Index peaks at 15, it gradually descends through the cooler months. This trend highlights a fluctuation between extreme and very high levels of sun exposure, emphasizing the need for sun protection year-round. Additionally, as we approach October, the UV Index climbs back to 13, signifying the return of stronger sun rays. For more detailed insights, visit Guaratuba UV Index.
UV Risk Categories
September in Guaratuba, Brazil, offers a delightful transition as the summer season begins to wane, boasting 236 hours of sunshine. While this is a dip from the vibrant peak of 300 hours in November and the sunny 317 hours of December, it still reflects the region's typically radiant climate. The month is nestled comfortably between August's 241 hours and October's 242 hours, showcasing a gentle decline in sunlight as days start to shorten. This trend of gradually reducing sunshine hours aligns with the arrival of spring, emphasizing the charm of Guaratuba as each season unfolds. Visitors can still revel in ample sunlight as they soak in the breathtaking coastal scenery.
In Guaratuba, Brazil, the likelihood of sunny weather fluctuates throughout the year, and September presents a modest chance of sunshine at 26%. This marks a notable dip compared to the sunnier months of July, which boasts a 57% chance of clear skies, and May at 42%. As winter fades and spring approaches, the sun's presence begins to wane slightly, with September experiencing lower sunshine probabilities similar to the transitional months like April (38%) and August (30%). While it may not be the sunniest time in Guaratuba, visitors can still expect a charming coastal experience amidst the variable clouds.
As the seasons shift in Guaratuba, Brazil, September marks a transition in daylight duration, offering about 11 hours of daylight each day. Following the summer peak in January with 13 hours of sunlight, the months gradually transition into shorter days, hitting their lowest in the heart of winter from May to July, where sunlight is limited to 10 hours. However, September's daylight duration signifies a slight rebound, mirroring the transition seen in August. The pattern of daylight length closely aligns with the changing seasons, hinting at the vibrant spring ahead, as October ushers back longer days, reminiscent of the sun-kissed summer months.
In Guaratuba, Brazil, September ushers in a gentle breeze with an average wind speed of 2.8 m/s (6 mph), slightly up from the calmer summer months. As the year progresses, this transition hints at the upcoming stronger winds of October, which average 3.3 m/s (7 mph). The winds during September offer a refreshing respite, making it perfect for leisurely outdoor activities along the coastline. Compared to the sluggish gusts of February and July, September's breezy conditions mark a reassuring shift in the air, foreshadowing the invigorating winds that define the latter part of the year. Overall, the September winds create a delightful balance, inviting locals and visitors alike to enjoy the enchanting beauty of Guaratuba's natural landscape.
Weather in Guaratuba varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Guaratuba, focusing on differences in temperature, rainfall, humidity, and UV levels.
In September, the weather features milder temperatures, with a minimum of 12°C (54°F) and an average of 20°C (68°F), peaking at a comfortable 28°C (82°F). The month experiences 91 mm (3.6 in) of precipitation over 14 days, coupled with a humidity level of 82%. In contrast, January brings much warmer conditions, with minimum temperatures of 19°C (67°F) and an average of 26°C (79°F), soaring to a maximum of 36°C (97°F). Rainfall increases significantly during this month, totaling 237 mm (9.3 in) over 21 days, and the humidity also rises slightly to 86%. For more detailed information, you can check out Guaratuba weather in January.
In September, temperatures range from a mild 12°C (54°F) at night to a comfortable 28°C (82°F) during the day, with an average temperature of 20°C (68°F). The month experiences around 91 mm (3.6 in) of precipitation spread over 14 days, and humidity hovers around 82%. In contrast, February is significantly warmer, with nighttime lows of 18°C (65°F) and daytime highs reaching up to 34°C (94°F), averaging 25°C (78°F). This month also sees an increase in precipitation, totaling 213 mm (8.4 in) across 20 days, while humidity remains slightly higher at 83%. For more details about February weather specifically, you can check Guaratuba weather in February.
September and March exhibit distinct differences in weather patterns. In September, temperatures range from a minimum of 12°C (54°F) to a maximum of 28°C (82°F), with an average of 20°C (68°F) and relatively lower humidity at 82%. This month sees moderate rainfall totaling 91 mm (3.6 in) over about 14 days. In contrast, March experiences warmer conditions, with temperatures ranging from 19°C (66°F) to 32°C (90°F) and an average of 25°C (77°F). The precipitation is significantly higher at 203 mm (8.0 in) spread over 24 days, accompanied by slight increases in humidity at 85%. For more specific insights into March weather, you can explore Guaratuba weather in March.
When comparing the weather in September and April, several differences become apparent. September tends to be slightly cooler, with average temperatures ranging from a minimum of 12°C (54°F) to a maximum of 28°C (82°F), while April experiences warmer conditions, with averages between 14°C (58°F) and 32°C (91°F). Additionally, April sees more precipitation, totaling 115 mm (4.5 in) over 17 days, compared to September's 91 mm (3.6 in) over 14 days. Both months have high humidity levels, with September at 82% and April slightly higher at 85%. For a detailed look at the weather specifics in April, you can check Guaratuba weather in April.
In comparing the weather of September and May, both months exhibit relatively mild temperatures, but May tends to be slightly warmer overall. September has a minimum temperature of 12°C (54°F) and an average of 20°C (68°F), while May's temperatures range from a low of 11°C (52°F) to an average of 21°C (69°F). However, May also sees slightly higher maximum temperatures, peaking at 29°C (84°F) compared to September's 28°C (82°F). Regarding precipitation, May is wetter with 127 mm (5.0 in) over 15 days, contrasted with September's 91 mm (3.6 in) across 14 days. Humidity levels are also a bit higher in May at 86%, compared to September's 82%. For more information, you can check Guaratuba weather in May.
In comparing the weather of September and June, we find that both months share similar maximum temperatures, peaking at 28°C (83°F). However, September tends to be slightly warmer with an average temperature of 20°C (68°F) compared to June's average of 19°C (67°F). June experiences slightly cooler minimum temperatures, with a low of 9°C (48°F) versus September's 12°C (54°F). Precipitation levels are higher in June, with 113 mm (4.5 in) of rain over 12 days, compared to September's 91 mm (3.6 in) across 14 days. Moreover, humidity levels are marginally elevated in June at 85%, as compared to 82% in September. For more detailed weather information, you can check Guaratuba weather in June.
September generally experiences milder temperatures compared to July, with average highs reaching 28°C (82°F) versus July's maximum of 29°C (84°F). However, September is wetter, receiving 91 mm (3.6 in) of precipitation over 14 days, compared to July's 32 mm (1.2 in) over just 7 days. Additionally, September has a slightly higher humidity level at 82%, compared to July's 80%. For more detailed weather insights, check out Guaratuba weather in July.
September's weather shows a slight increase in average and minimum temperatures compared to August, with averages of 20°C (68°F) and a low of 12°C (54°F), versus August's average of 18°C (65°F) and a low of 8°C (46°F). Both months have the same maximum temperature of 28°C (82°F), but September experiences more precipitation, totaling 91 mm (3.6 in) over 14 days, compared to August's 72 mm (2.8 in) over 11 days. Humidity is also marginally higher in September at 82% compared to August's 79%. For more details, you can check Guaratuba weather in August.
In comparison to September, October experiences slightly warmer temperatures, with minimums rising from 12°C (54°F) to 16°C (60°F) and average highs increasing from 28°C (82°F) to 31°C (89°F). While September has a total precipitation of 91 mm (3.6 in) over 14 rainy days, October sees a substantial increase in rainfall, totaling 166 mm (6.6 in) across 19 days. Despite the increase in precipitation, the humidity remains steady at 82% for both months, contributing to a distinctly warmer and wetter October. For more detailed information, you can check Guaratuba weather in October.
In comparing the weather between September and November, we see some notable differences. September typically features milder temperatures, with a minimum of 12°C (54°F) and an average of 20°C (68°F), while November warms up to a minimum of 15°C (60°F) and an average of 22°C (72°F). The maximum temperatures in November can reach a sweltering 32°C (89°F), significantly higher than September’s peak of 28°C (82°F). Additionally, November experiences increased precipitation, totaling 153 mm (6.0 in) over 20 days, compared to September's 91 mm (3.6 in) over 14 days. Humidity also rises slightly from 82% in September to 86% in November. For a more detailed look at November weather, check out Guaratuba weather in November.
In September, the weather is generally mild, with average temperatures ranging from a minimum of 12°C (54°F) to a maximum of 28°C (82°F), creating a comfortable atmosphere for outdoor activities. However, it experiences significant rain, averaging 91 mm (3.6 in) over about 14 days, with humidity levels sitting at 82%. In contrast, December brings warmer conditions, where temperatures rise to an average of 24°C (76°F), with highs soaring up to 32°C (89°F). This month also sees an increase in precipitation, totaling 193 mm (7.6 in) across approximately 20 rainy days, and humidity levels climb to 88%. For a detailed look at December weather, you can visit Guaratuba weather in December.
September in Guaratuba ushers in a refreshing transition from the winter chill, marked by a notable rise in temperature and humidity. With an average temperature of around 20°C (68°F), the days become pleasantly warm, offering a delightful escape from the preceding cooler months. Despite experiencing about 14 days of precipitation, this month typically sees less rainfall than the summer peak, allowing for more sun-soaked afternoons. The 82% humidity adds a tropical flair, but it’s the gradual warming that truly sets September apart, making it a unique time to enjoy the beautiful coastal scenery. For more detailed insights on what to expect throughout the year, check out the Guaratuba Climate page.