Last updated: August 21, 2025
In September, Parnaiba, Brazil experiences pleasantly warm weather, with maximum temperatures reaching 36°C (97°F) and an average of 29°C (84°F) that invites outdoor activities. The nights are comfortably mild, with temperatures dipping to a minimum of 23°C (74°F). Remarkably, this month witnesses no rainfall, as precipitation is a mere 2 mm (0.1 in) across zero rain days. Coupled with a comfortable humidity level of 55%, September is an ideal time to explore the vibrant landscapes and rich culture of Parnaiba under the sun’s warm embrace.
In September, Parnaiba, Brazil experiences a slight rise in temperatures, with minimums reaching 23°C (74°F) and averages climbing to 29°C (84°F). The region warms up further with maximum temperatures peaking at 36°C (97°F), marking it as one of the hotter months of the year. This trend showcases a gradual progression from August’s highs, where temperatures already flirted with the heat of summer, suggesting that September is a month of warming transition as the days grow longer. Visitors can expect balmy conditions perfect for enjoying the vibrant local culture and stunning landscapes.
In Parnaiba, Brazil, the month of September marks a significant shift in the precipitation pattern, showcasing a sharp decline to a mere 2 mm (0.1 in) of rainfall, which is consistent with the trend observed in the preceding month of August, where only 3 mm (0.1 in) fell. This decline results in no precipitation days recorded during September, emphasizing a dry spell that is typical as the region transitions away from its wetter months. In contrast, the rain-soaked months earlier in the year, particularly March and April, see totals soaring above 300 mm, highlighting the stark difference in rainfall distribution throughout the year. As the dry season takes hold, it becomes evident that September serves as a clear marker of the drier conditions that precede the sporadic showers of the upcoming months.
In September, Parnaiba, Brazil, experiences a noticeable shift in humidity, with levels dropping to a refreshing 55%. This marks a significant decline from the peak of 90% in April and a stark contrast to the high humidity of January through March, when averages hover around 87-89%. Following the summer months, where humidity begins to wane progressively, September stands as a transitional month, mirroring the dry post-winter conditions seen in August at 54%. As the year progresses into the warmer months ahead, one can expect a slight uptick in humidity, but September’s drier atmosphere offers a brief and enjoyable respite, setting the stage for a more comfortable climate.
In September, Parnaíba, Brazil, experiences a UV Index of 13, categorizing it as extreme and maintaining a consistent burn time of just 10 minutes. This month continues the trend seen throughout the year, where the UV levels remain persistently high. Following a slight decline from the peak in March at 16, September's index echoes the levels observed earlier in the year, illustrating the region's intense sun exposure. As the seasons change, it’s crucial for residents and visitors alike to remain vigilant against UV radiation risks. To learn more about the UV Index trends throughout the year, visit Parnaiba UV Index.
UV Risk Categories
September in Parnaíba, Brazil, is a delightful bridge between the peak of winter and the blossoming warmth of spring, boasting an impressive 345 hours of sunshine. This month showcases a slight dip from the sun-soaked heights of August, which recorded 349 hours, yet it still stands as one of the sunniest periods of the year. As daylight hours begin to dwindle just a touch, the cheerful glow of the sun remains a vibrant feature, with sunshine peaking in October at 357 hours. The trend throughout the year is clear: from January’s modest 255 hours to the radiant mid-year months, Parnaíba’s sunshine grows increasingly abundant, making every September day a golden opportunity to bask in the beauty of this stunning coastal city.
In Parnaiba, Brazil, September marks the peak of sunny weather, with a remarkable 69% chance of sunshine that delights locals and visitors alike. As the dry season progresses from the earlier months, this vibrant transition becomes evident, with clear trends showcasing a steady increase in sunlight from just 22% in January to an impressive 68% in August. With each passing month, the prospects for clear skies improve, and by the time September arrives, the region is basking in the warmth of nearly two-thirds of the days filled with sunlight. Following September, the likelihood of sunny days begins to dip slightly, highlighting this month as a prime time for outdoor adventures in this beautiful coastal city.
In September, Parnaíba, Brazil, enjoys an invigorating 12 hours of daylight, consistent with many months throughout the year. This trend of stability is remarkable, as the city experiences a well-balanced photoperiod from January to April and then again from August through December. Notably, the only dips in daylight occur during May, June, and July, where the duration reduces to 11 hours. As spring approaches, September's revitalizing daylight sets the stage for outdoor adventures and vibrant community life, reinforcing Parnaíba's allure as a destination that thrives in the warmth and light all year round.
As the calendar turns to September, Parnaiba, Brazil, welcomes a refreshing change in its wind patterns. With an average wind speed of 5.6 m/s (13 mph), September stands out as one of the breeziest months of the year, offering a delightful prelude to the upcoming spring season. This noticeable uptick in wind speed, following the milder breezes of previous months, signals a shift towards livelier conditions, which are characteristic of the transitional period between winter and spring. Interestingly, this trend continues into October, where the wind remains steady at the same invigorating pace of 5.6 m/s. As the warmer months approach, the increasingly robust winds provide ideal conditions for outdoor activities, captivating locals and visitors alike.
Weather in Parnaiba varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Parnaiba, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January present quite contrasting weather conditions. In September, temperatures range from a minimum of 23°C (74°F) to a maximum of 36°C (97°F), with an average of 29°C (84°F). This month enjoys very little precipitation, recorded at just 2 mm, and is characterized by a moderate humidity level of 55%. In contrast, January experiences a slightly cooler average temperature of 28°C (82°F), with minimums and maximums of 23°C (74°F) and 35°C (96°F) respectively. However, January is marked by significant rainfall, receiving 121 mm over 20 days, and higher humidity levels at 87%. For more detailed insights, check out Parnaiba weather in January.
September and February exhibit markedly different weather patterns. September boasts high average temperatures ranging from a minimum of 23°C (74°F) to a maximum of 36°C (97°F), accompanied by low precipitation, with only 2 mm (0.1 in) recorded across the month and a comfortable humidity level of 55%. In contrast, February tends to be cooler, with an average temperature of 27°C (81°F) and a maximum of 34°C (94°F), but it experiences significant rainfall, accumulating 279 mm (11.0 in) over 25 days, while humidity levels soar to 88%. This comparison highlights how September is generally hot and dry, whereas February is cooler and notably wet. For more detailed insights, check Parnaiba weather in February.
September and March present strikingly different weather patterns. In September, temperatures range from a comfortable minimum of 23°C (74°F) to a peak of 36°C (97°F), with an average of 29°C (84°F). The month is remarkably dry, featuring only 2 mm of precipitation and no rainy days, alongside a humidity level of 55%. In contrast, March experiences cooler temperatures, with a minimum of 22°C (73°F) and a maximum of 33°C (91°F), averaging 27°C (81°F). However, this month is characterized by heavy rainfall, totaling 308 mm (12.1 in) over 30 days, and a high humidity of 89%. For more details, you can visit Parnaiba weather in March.
In September, the weather is typically hot and dry, with average temperatures ranging from a minimum of 23°C (74°F) to a maximum of 36°C (97°F), and very little rainfall, receiving only about 2 mm over the month. Humidity levels are moderate at 55%, making the heat somewhat bearable. In stark contrast, April brings significantly wetter conditions, with average temperatures ranging from 23°C (74°F) to 34°C (93°F), and an impressive 293 mm (11.5 in) of rainfall spread across approximately 25 days. The humidity in April is also much higher at 90%, leading to a much more humid and sultry atmosphere. For more details on weather conditions during this month, check Parnaiba weather in April.
September and May present notably different weather patterns. In September, temperatures start at a minimum of 23°C (74°F) and can rise to a maximum of 36°C (97°F), with an average of 29°C (84°F). The month is exceptionally dry, receiving only 2 mm (0.1 in) of precipitation over zero rainy days and 55% humidity. In contrast, May sees slightly lower temperatures, with a range from 23°C (74°F) to a maximum of 33°C (92°F) and an average of 27°C (82°F). However, it is much wetter, with 184 mm (7.2 in) of rainfall spread across 18 days, and higher humidity at 87%. For a closer look at weather specifics, you can check Parnaiba weather in May.
In September, the weather tends to be slightly warmer, with average temperatures reaching 29°C (84°F), compared to June's average of 28°C (82°F). Both months share a minimum temperature of around 23°C (73-74°F), but September sees a higher maximum temperature of 36°C (97°F) against June's 35°C (95°F). Additionally, September is notably drier, experiencing minimal precipitation of just 2 mm (0.1 in) on no rainy days, while June is considerably wetter, with 39 mm (1.5 in) of rainfall spread over six days and higher humidity levels at 77%. For more detailed information on June's climate, you can visit Parnaiba weather in June.
In comparison to July, September experiences slightly warmer temperatures, with average highs reaching 36°C (97°F) compared to July's 35°C (95°F). Both months have minimal variation in minimum temperatures, with September having a minimum of 23°C (74°F) and July 22°C (72°F). Notably, September boasts significantly lower precipitation, recording only 2 mm (0.1 in) over the month and no rainy days, unlike July, which receives 31 mm (1.2 in) of rain across three days. Additionally, September has lower humidity levels at 55% compared to July's 62%, making it feel somewhat more comfortable overall. For more detailed insights, you can check out Parnaiba weather in July.
In September, the weather remains warm with minimum temperatures averaging 23°C (74°F) and maximums reaching up to 36°C (97°F). This is slightly warmer than August, which has a minimum of 22°C (71°F) and the same maximum of 36°C (98°F). Both months experience minimal precipitation, with September receiving just 2 mm (0.1 in) and August slightly higher at 3 mm (0.1 in), yet both months have no rainy days. Humidity levels are also similar, with September at 55% and August at 54%. For a closer look at August weather specifics, you can visit Parnaiba weather in August.
In September, the weather remains quite warm with a minimum temperature of 23°C (74°F) and an average of 29°C (84°F), peaking at 36°C (97°F), all while enjoying no rainfall and a humidity level of 55%. In contrast, October brings a slight rise in temperatures, with a minimum of 24°C (75°F) and a similar average of 29°C (84°F), but the maximum temperature increases to 37°C (99°F). October also sees some rainfall, totaling 7 mm (0.3 in) over just one day, and a slight uptick in humidity to 58%. For more details, check out Parnaiba weather in October.
In September, the weather tends to be hot and dry, with temperatures ranging from a minimum of 23°C (74°F) to a maximum of 36°C (97°F) and an average of 29°C (84°F). This month sees virtually no precipitation, with humidity levels at 55%. In contrast, November offers slightly warmer minimum temperatures at 24°C (75°F) and slightly higher maximums peaking at 37°C (98°F), while maintaining the same average of 29°C (84°F). However, November is notable for its increased humidity at 62% and a total precipitation of 20 mm (0.8 in) over four days. For more detailed insights into the weather during this month, check out Parnaiba weather in November.
In September, the weather in Parnaíba is characterized by warm temperatures, with a minimum of 23°C (74°F) and an average high of 36°C (97°F). The month is relatively dry, receiving just 2 mm of precipitation and experiencing no rainy days, while humidity hovers around 55%. In contrast, December sees similar average temperatures, but with a slight increase in minimum temperature to 24°C (75°F). This month is notably wetter, with a total of 57 mm of precipitation spread over 10 days, leading to a higher humidity level of 74%. For more details on December weather, you can visit Parnaiba weather in December.
In September, Parnaiba enjoys a shift towards drier conditions, boasting minimal precipitation and a pleasant average temperature that adds to the region's appeal. Unlike the wetter months, the humidity is comfortably balanced at 55%, making outdoor activities enjoyable throughout the day. With daytime temperatures peaking at a warm 36°C, the month strikes an ideal balance, offering both warmth and sunshine while being free of the rainy interruptions seen in other times of the year. For a deeper dive into the weather patterns of this region, visit Parnaiba Climate.