Last updated: August 21, 2025
In September, Barreirinhas, Brazil basks in warm and inviting weather, with maximum temperatures soaring up to 35°C (95°F) and an average of 28°C (83°F), providing ideal conditions for outdoor adventures. The nights are pleasantly mild, with minimum temperatures around 23°C (74°F). Remarkably, the month witnesses virtually no rainfall, accumulating only 6 mm (0.2 in), ensuring clear skies and ample sunshine for visitors to explore the stunning landscapes of the Lençóis Maranhenses National Park. With humidity levels at a comfortable 51%, September is a prime time to experience the natural beauty and vibrant culture of this enchanting coastal destination.
As September rolls into Barreirinhas, Brazil, the temperature begins to reflect a vibrant transition into warmer days. The month boasts a minimum temperature of 23°C (74°F), providing a comfortable foundation for the average of 28°C (83°F) that enlivens the landscape. With maximum temperatures reaching a sweltering 35°C (95°F), September enjoys the peak heat of late Brazilian winter, matching the intensity typically felt in August. This slight uptick in warmth accompanies a gradual shift into spring, inviting both locals and visitors to revel in the sultry sun while exploring the stunning natural beauty of the region. Overall, September is a time where the balmy temperatures set the stage for vibrant outdoor adventures amidst Barreirinhas' breathtaking scenery.
In Barreirinhas, Brazil, September marks a notable transition in the precipitation pattern. With a mere 6 mm (0.2 in) of rain recorded throughout the month, it stands out as one of the driest periods in the year, accompanied by no precipitation days. This sharp decline follows the heavy rainfall experienced from January through August, where monthly averages peaked significantly, especially in March with 349 mm (13.7 in). As the region shifts from its wet season, September serves as a clear indicator of the drying trend that continues into October, suggesting a lull before the remnant rains return. This pattern highlights Barreirinhas' unique climate cycle, showcasing how quickly the landscape can transition from lush to arid.
As the months unfold in Barreirinhas, Brazil, a distinct trend in humidity levels emerges, particularly in September when the humidity reaches a comfortable 51%—the lowest since the drier season began in late summer. Following the peak of 92% in April, the region experiences a significant drop, with humidity steadily declining from August's 55%. This gradual decrease signals a transition into the drier months, making September an ideal time to explore the stunning landscapes without the oppressiveness of high humidity. As the year progresses, humidity levels begin to rise again, hinting at the return of the lush, tropical climate typical of Barreirinhas.
In September, Barreirinhas, Brazil, continues to embrace its summer-like intensity with a UV Index of 13, categorized as extreme. This reflects a slight dip from the peak values earlier in the year, yet still underscores the need for caution when enjoying the sun. With a consistent burn time of just 10 minutes, beachgoers should remain vigilant and adequately protected against skin damage. As we move into October, the UV Index holds steady at 13, indicating that while the intensity may wane slightly, the potential for harm remains high. For those looking to plan their sun exposure, staying informed is key—check out more details at Barreirinhas UV Index.
UV Risk Categories
September in Barreirinhas, Brazil, offers a delightful blend of sunny days, boasting 339 hours of sunshine that perfectly captures the spirit of early spring. As summer wanes, the sunlight begins to soften while still providing ample warmth, making this month particularly appealing for outdoor adventures and exploration. With September following a peak in sunshine during August, which had 347 hours, it marks a slight decline yet remains significantly higher than the earlier months of the year. This trend of increasing sunshine continues as October approaches, promising even 356 hours ahead. Visitors can revel in the vibrant landscapes and charming ambiance that Barreirinhas offers during this radiant month, making the most of the lingering summer vibes.
In Barreirinhas, Brazil, September offers a promising chance of sunny weather, with a 59% likelihood of sunshine. This vibrant month follows a remarkable upward trend in clear skies, as the sunny days gradually increase from the relatively modest 18% in January to a peak of 66% in August. While September's sunshine probability slightly tapers off compared to August, it remains robust, reflecting a transition into the more favorable conditions of the latter part of the year. As travelers and locals alike anticipate the end of winter, the pleasant weather in September beckons visitors to explore the spectacular dunes and rich landscapes of the region.
In Barreirinhas, Brazil, the daylight duration reveals an intriguing pattern throughout the year. From January to April, residents and visitors enjoy a consistent 12 hours of daylight, providing ample time to explore the stunning landscapes. As May rolls in, daylight begins to decrease slightly to 11 hours, a trend that persists through June and July, ushering in the cooler months. However, this dip is short-lived; by August, the daylight extends back to 12 hours, and this generous duration continues into September and beyond, reaffirming Barreirinhas’s appeal for outdoor activities and vibrant sunsets year-round. The balance of light and dark creates an inviting atmosphere that enhances the charm of this coastal gem.
As September rolls into Barreirinhas, Brazil, the winds begin to pick up, reaching an average speed of 5.0 m/s (11 mph). This marks a noticeable increase compared to the lighter breezes of earlier months like May, which saw just 2.5 m/s (6 mph). The trend signifies a transition from the milder winds of winter into a more invigorating atmosphere as spring approaches. With September's gusts being amongst the highest recorded this year, it's a perfect time for adventure seekers to embrace the elements, whether it's for kitesurfing or enjoying a leisurely walk along the stunning dunes, as the winds whisper secrets of the season's change.
Weather in Barreirinhas varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Barreirinhas, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January present distinct weather contrasts. In September, temperatures typically range from a minimum of 23°C (74°F) to a maximum of 35°C (95°F), with an average of 28°C (83°F), while humidity hovers around 51%. This month sees minimal precipitation, totaling only 6 mm (0.2 in) and with no rainy days. In stark contrast, January experiences a cooler average temperature of 27°C (81°F), with highs up to 33°C (91°F) and consistent humidity levels reaching 89%. This month is marked by substantial rainfall, accumulating 135 mm (5.3 in) over 22 rainy days. For more details on January's weather, check out Barreirinhas weather in January.
September and February present starkly contrasting weather conditions. In September, the temperatures are generally warm, with minimums around 23°C (74°F) and average highs reaching 35°C (95°F). The month is characterized by low precipitation, averaging only 6 mm with no rainy days, and humidity levels sitting at a comfortable 51%. In contrast, February sees similar minimum temperatures of 23°C (73°F) but average highs drop to 32°C (91°F). The month is marked by heavy rainfall, with a staggering total of 302 mm (11.9 in) over 27 days, resulting in significantly higher humidity at 90%. This makes February feel much wetter and more humid overall. For a closer look at February weather specifics, visit Barreirinhas weather in February.
In September, Barreirinhas experiences warm temperatures with a minimum of 23°C (74°F) and an average high of 35°C (95°F), while rainfall is virtually nonexistent, with only 6 mm of precipitation over the month. The humidity is relatively comfortable at 51%. In contrast, March brings a significant shift in weather, as the minimum temperature remains similar at 23°C (73°F), but the average high drops to 32°C (91°F). March is characterized by heavy rainfall, accumulating 349 mm (13.7 in) over 30 days, along with increased humidity levels at 90%. This stark contrast highlights September as a drier, sunnier month, while March tends to be much wetter and more humid. For more detailed insights, check out Barreirinhas weather in March.
When comparing the weather in September and April, notable differences emerge. September typically enjoys warmer temperatures, with a minimum of 23°C (74°F) and an average of 28°C (83°F), peaking at 35°C (95°F). This month also boasts minimal precipitation, averaging only 6 mm (0.2 in) with 0 rainy days and a humidity level of 51%. In contrast, April features slightly cooler temperatures with a minimum of 22°C (73°F) and an average of 27°C (81°F), reaching a maximum of 32°C (91°F). However, April is characterized by significant rainfall, accumulating 328 mm (12.9 in) over 28 days and a much higher humidity level of 92%. For a deeper look at April’s weather, you can explore Barreirinhas weather in April.
When comparing the weather in September and May, noticeable differences arise in temperature and precipitation. September boasts warmer temperatures, with a minimum of 23°C (74°F), an average of 28°C (83°F), and a peak of 35°C (95°F). In contrast, May features slightly cooler conditions, with temperatures ranging from a minimum of 22°C (73°F) to a maximum of 32°C (91°F). However, May is significantly wetter, receiving 236 mm (9.3 in) of rainfall over 22 days, compared to September's dry and humid conditions with just 6 mm (0.2 in) of precipitation and no rainy days. The humidity is also markedly higher in May at 89%, versus 51% in September. For a closer look at May's weather, visit Barreirinhas weather in May.
In comparing the weather between September and June, we notice distinct differences that characterize each month. September tends to be warmer, with average temperatures reaching 28°C (83°F) and maximums peaking at 35°C (95°F), while June has a slightly cooler average of 27°C (82°F) and a maximum of 32°C (90°F). Additionally, September is notably drier, recording only 6 mm (0.2 in) of precipitation and no rainy days, in stark contrast to June, which experiences significant rainfall at 70 mm (2.8 in) over 12 days, contributing to a higher humidity level of 79%. For more specific details, you can refer to Barreirinhas weather in June.
In comparing the weather of September and July, September boasts slightly higher temperatures, with averages reaching 28°C (83°F) compared to July's 27°C (81°F). Both months see mild minimum temperatures, but September can peak at 35°C (95°F), making it hotter than July's maximum of 33°C (92°F). A notable difference lies in precipitation; September experiences a dry spell with only 6 mm (0.2 in) over 0 days, while July is considerably wetter, receiving 53 mm (2.1 in) across 8 days, contributing to a higher humidity level of 64% compared to September's 51%. For a closer look at July weather specifics, check out Barreirinhas weather in July.
In September, the weather remains warm, with a minimum temperature of 23°C (74°F) and an average of 28°C (83°F), similar to August's average. However, September experiences slightly less humidity at 51%, compared to August's 55%. Notably, September is drier, reporting only 6 mm (0.2 in) of precipitation over 0 days, while August had 11 mm (0.4 in) of rain spread across 2 days. For more detailed insights into the weather during August, visit Barreirinhas weather in August.
In comparing the weather of September and October, both months maintain a similar average temperature of 28°C (83°F), but October sees a slight rise in minimum and maximum temperatures, reaching 24°C (76°F) and 35°C (96°F) respectively. September experiences no precipitation, while October has a total of 11 mm (0.4 in) spread over three days, indicating a more humid environment with increased humidity levels of 53%. For those interested in more details, you can explore the Barreirinhas weather in October.
In comparing the weather between September and November, we see some notable differences. September boasts warmer temperatures, with a minimum of 23°C (74°F) and a maximum of 35°C (95°F), alongside very little rainfall—only 6 mm over zero days—and a humidity level of 51%. In contrast, November experiences slightly cooler temperatures, with a minimum of 24°C (75°F) and a maximum of 34°C (93°F), but it brings significantly more rain, with 35 mm spread over 8 days, resulting in higher humidity at 60%. For more specific details on November weather, check out Barreirinhas weather in November.
In September, Barreirinhas experiences warm temperatures, with a minimum of 23°C (74°F) and an average of 28°C (83°F), reaching up to a maximum of 35°C (95°F). The month is relatively dry, with only 6 mm (0.2 in) of precipitation reported on 0 days and humidity levels at a comfortable 51%. In contrast, December sees similar temperatures, maintaining a minimum of 23°C (74°F) and an average of 28°C (83°F), but with a slightly cooler maximum of 34°C (94°F). However, December is much wetter, experiencing 59 mm (2.3 in) of precipitation over 13 days, resulting in a higher humidity level of 78%. For more details on December weather, visit Barreirinhas weather in December.
As September unfolds in Barreirinhas, residents and visitors alike can relish in the warmth and dry conditions that set it apart from other months. With maximum temperatures reaching up to 35°C and an average of 28°C, the weather is pleasantly hot without the interruptions of rain, as the month sees no precipitation days. The humidity remains moderate at 51%, contributing to an overall enjoyable tropical climate. This makes September an ideal time for outdoor adventures and exploring the stunning landscapes of the region. For a deeper dive into what to expect throughout the year, check out Barreirinhas Climate.