Last updated: August 21, 2025
In September, Petrolina, Brazil experiences warm temperatures with a maximum soaring to 39°C (103°F) and an average of 27°C (81°F), providing a tropical backdrop for outdoor activities. The month sees a very minimal precipitation, recording only 3 mm (0.1 in) of rain across zero rainy days, making it a great time for enjoying sunny skies. With relative humidity around 56%, the conditions remain pleasantly dry, perfect for exploring this vibrant region. Whether you’re lounging by the river or wandering through local markets, September offers an exceptional climate for both relaxation and adventure.
September in Petrolina, Brazil, marks a notable transition as temperatures begin to climb, reaching a vibrant maximum of 39°C (103°F), a slight uptick from the cooler July and August. With a minimum temperature of 19°C (66°F) and an average of 27°C (81°F), residents and visitors are welcomed by warm days and balmy nights, signaling the approach of the hot season. This slight rebound in warmth is accompanied by the lingering comfort of early spring, creating a perfect environment for outdoor activities and exploration. As the month progresses, the sun shines brightly over this thriving region, offering a glimpse into the fiery heat that characterizes the months to come.
In September, Petrolina, Brazil experiences a notable shift in precipitation, with rainfall measuring only 3 mm (0.1 in) across the month. This minimal amount contrasts sharply with the 69 mm (2.7 in) recorded in February and signifies a decline leading into the dry season. Notably, September marks the first month since May where the region has recorded zero days of precipitation, reflecting the increasingly arid conditions as summer approaches. This trend indicates an ongoing reduction in rainfall, as the monthly averages continue to drop, culminating in the lowest precipitation levels observed throughout the year. Such patterns underline the region's significant variation in rainfall, transitioning from wetter months to a considerably drier climate as it moves towards the latter part of the year.
In September, Petrolina experiences a notable decline in humidity, dropping to 56%—one of the lowest levels of the year. This significant decrease marks a continued trend from the much higher humidity levels of earlier months, where figures soared above 80%. As the dry season approaches, the air becomes increasingly comfortable, transitioning from the sultry conditions of summer to a more refreshing atmosphere. This shift not only enhances outdoor activities but also provides a reprieve for residents after the humid embrace of the preceding months. By October, humidity further reduces to 51%, suggesting a refreshing change as the region bids farewell to the dampness of winter and welcomes a drier climate.
In September, Petrolina experiences a UV Index of 13, categorizing it as extreme and maintaining the trend of significant solar intensity seen throughout the year. Following a pattern established from January through August, where the Index remained consistently high (ranging from 12 to 15), September's data continues to highlight the necessity for sun protection, with a burn time of only 10 minutes. As we transition into the later months, October is expected to reach a UV Index of 14, reinforcing the area's persistent exposure to intense sunlight. For those enjoying the outdoors in this vibrant Brazilian city, it’s crucial to stay informed and protect your skin. For more detailed information, visit Petrolina UV Index.
UV Risk Categories
In September, Petrolina, Brazil, basks in 317 hours of glorious sunshine, seamlessly continuing the trend established in August. As the seasons shift, residents and visitors alike can revel in a delightful consistency of bright, sun-kissed days. Following the summer peak in October, where sunlight reaches a dazzling 350 hours, this month's sun is a precursor to even more radiant days ahead. The overall pattern for the year showcases a vibrant climate, with sunshine hours typically trending higher during the latter months, inviting outdoor adventures and a lively atmosphere as the year draws to a close.
In Petrolina, Brazil, September marks a significant uptick in sunny weather, boasting a 69% chance of sunshine. This trend showcases an intriguing shift as the region transitions from the milder months of winter. Following a consistent pattern of increasing sun from the cooler periods of June and July, which hover around 61% and 44%, respectively, September emerges as one of the sunniest months of the year. This surge not only promises more vibrant days but also signals the onset of warmer weather, leading into the exciting spring and summer seasons. By the time October rolls around, the chances of sunshine slightly dip to 59%, yet the overall trend indicates that September is a golden opportunity for sun-seekers in Petrolina.
In Petrolina, Brazil, the daylight duration demonstrates a fascinating pattern throughout the year. From January through March, the day spans a consistent 12 hours, providing ample sunlight during the peak of summer. As the seasons shift in April, daylight begins to wane, dipping to 11 hours and maintaining that level until August. However, come September, the days stretch back to 12 hours, marking a return to the lengthier daylight seen earlier in the year. This consistency in daylight reflects the region’s unique climate, allowing residents and visitors alike to enjoy the outdoors throughout the year, irrespective of minor seasonal variations.
As September graces Petrolina, Brazil, the winds continue their gentle dance, averaging 5.3 m/s (12 mph), a slight drop from the heights of August's 6.1 m/s (14 mph). This month marks a transition in the year, illustrating a gradual shift in wind patterns. From a steady climb starting in late spring with May's 5.0 m/s (11 mph) and peaking in the height of the dry season, the winds of September still provide a refreshing breeze, maintaining a moderate pace. Notably, this month serves as a bridge to milder winds that follow in October, hinting at the eventual calm of the approach to the rainy season. With each gust, September captures the essence of change, making it a delightful time for those who admire the subtleties of nature’s rhythm.
Weather in Petrolina varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Petrolina, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January exhibit distinct weather patterns. September tends to be slightly cooler, with temperatures ranging from a minimum of 19°C (66°F) to a maximum of 39°C (103°F), alongside minimal precipitation of only 3 mm (0.1 in) and no rainy days. In contrast, January experiences slightly warmer temperatures, with a range from 21°C (70°F) to 38°C (100°F), along with increased humidity at 86% and more frequent rainfall, totaling 26 mm (1.0 in) over four days. For more specific details, you can check Petrolina weather in January.
In comparing the weather of September and February, September typically enjoys warmer days with an average temperature of 27°C (81°F) and a maximum that can soar to 39°C (103°F). This month is relatively dry, recording only 3 mm of precipitation with no rainy days, leading to a moderate humidity level of 56%. In contrast, February features slightly cooler average temperatures at 28°C (83°F), but it is marked by higher humidity at 90% and significant rainfall, totaling 69 mm over approximately 10 rainy days. For a more detailed look at February weather, you can check out Petrolina weather in February.
In September, the weather tends to be warm with average temperatures around 27°C (81°F) and a maximum of 39°C (103°F), while experiencing low precipitation at only 3 mm (0.1 in) and no rainy days. In contrast, March has slightly higher minimum temperatures of 21°C (70°F) and an average of 28°C (83°F), but also brings significant rainfall, accumulating 59 mm (2.3 in) over nine days, resulting in a much higher humidity level of 92%. To explore more about the unique weather of March, you can visit Petrolina weather in March.
September and April exhibit notable differences in weather conditions. September, characterized by warmer days, features temperatures ranging from a minimum of 19°C (66°F) to a maximum of 39°C (103°F) with an average of 27°C (81°F). It is a dry month with virtually no precipitation and a humidity level of 56%. In contrast, April experiences slightly cooler temperatures, with a minimum of 21°C (70°F), an average of 28°C (82°F), and a maximum of 37°C (98°F). This month is significantly wetter, receiving 40 mm (1.6 in) of rain over about 7 days, and boasts a much higher humidity level of 90%. For more detailed information, you can check out Petrolina weather in April.
In comparing the weather between September and May, we see some notable differences despite their similar averages. In September, temperatures range from a minimum of 19°C (66°F) to a maximum of 39°C (103°F), with an average of 27°C (81°F). Remarkably, September experiences very little precipitation, with only 3 mm (0.1 in) of rainfall over zero rainy days, and humidity levels are moderately comfortable at 56%.
In contrast, May features similar high temperatures, peaking at 38°C (100°F) with the same minimum of 19°C (66°F) and an average of 27°C (80°F). However, May is marked by greater humidity at 84% and more precipitation, receiving around 13 mm (0.5 in) across two rainy days. This makes May feel more humid and crowded, as indicated in the detailed analysis found in Petrolina weather in May.
In comparing the weather between September and June, September typically experiences warmer temperatures, with averages around 27°C (81°F) and maximums reaching up to 39°C (103°F). In contrast, June offers slightly cooler conditions, with an average temperature of 25°C (78°F) and maximums peaking at 35°C (95°F). While both months present low precipitation levels, September stands out with no recorded rain, whereas June experiences about 7 mm (0.3 in) of rainfall over just one day. Additionally, September has lower humidity at 56%, compared to the higher humidity levels in June, which are around 76%. For more specifics on June weather, you can check Petrolina weather in June.
In comparing the weather between September and July, September tends to be warmer overall, with average temperatures reaching 27°C (81°F) and a maximum of 39°C (103°F), significantly higher than July's average of 25°C (76°F) and maximum of 35°C (96°F). Humidity levels are also lower in September at 56%, compared to July’s higher humidity of 68%. While both months experience minimal precipitation, July sees a slightly higher rainfall of 6 mm (0.2 in) compared to September's 3 mm (0.1 in), making it a drier month overall. For more detailed insights on July's climate, you can check Petrolina weather in July.
In comparing the weather of September and August, September experiences slightly higher temperatures, with a minimum of 19°C (66°F) and an average of 27°C (81°F), compared to August's minimum of 17°C (63°F) and average of 25°C (78°F). The maximum temperatures also rise in September, reaching up to 39°C (103°F), while August peaks at 36°C (97°F). Although both months see minimal precipitation of just 3 mm (0.1 in) in September and 4 mm (0.1 in) in August, September has a slight edge with no rainy days reported, just like August. Humidity is also a bit lower in September at 56% compared to August's 62%. For more detailed information on August weather, you can refer to Petrolina weather in August.
September and October present a gradual transition in weather, with October typically offering slightly warmer temperatures. In September, the minimum temperature is around 19°C (66°F) and the average reaches 27°C (81°F), while in October, the minimum increases to 20°C (69°F) and the average climbs to 29°C (84°F). Although both months enjoy predominantly dry conditions, October experiences a bit more precipitation, totaling 12 mm (0.5 in) over 2 days, contrasted with September's near-complete dryness. Humidity remains fairly consistent, slightly lower in October at 51% compared to September's 56%. For more details, check out Petrolina weather in October.
In comparing the weather of September and November, we see a notable shift in conditions. September features warmer temperatures, with a minimum of 19°C (66°F) and an average of 27°C (81°F), while November starts slightly warmer, with a minimum of 21°C (69°F) and an average of 29°C (84°F). Despite both months experiencing a maximum temperature of 39°C (103°F), November sees a notable increase in precipitation, totaling 21 mm (0.8 in) over four days, compared to September's dry spell with no recorded rain. Additionally, the humidity is slightly lower in November at 44%, compared to 56% in September. For a closer look at November's weather specifics, you can visit Petrolina weather in November.
In September, the weather is characterized by warm temperatures, with a minimum of 19°C (66°F) and an average of 27°C (81°F), while it can peak at a scorching 39°C (103°F). The month is notably dry, receiving only 3 mm (0.1 in) of precipitation and experiencing no rainy days, alongside a humidity level of 56%. In contrast, December offers slightly warmer conditions with a minimum of 21°C (70°F) and an average of 29°C (84°F), also reaching highs of 39°C (103°F). However, this month sees increased precipitation at 41 mm (1.6 in) over 5 rainy days, resulting in a marginally higher humidity of 59%. For a more detailed look at December's weather, you can visit Petrolina weather in December.
As September unfolds in Petrolina, it brings a warm embrace characterized by generally mild temperatures and a noticeable absence of rainfall, which is a stark contrast to the wetter months ahead. With an average temperature that invites outdoor activities, this month stands out for its dry conditions, showcasing the region’s vibrant climate. The 56% humidity adds to the warmth, ensuring that even cooler evenings retain a cozy feel. For a deeper understanding of how this month compares to others throughout the year, explore more at Petrolina Climate.