Last updated: August 21, 2025
Experience the vibrant September weather of Puerto Iguazu, Argentina, where temperatures range from a warm 9°C (49°F) at night to a sweltering 39°C (102°F) during the day, with an average of 23°C (74°F). This month features 78 mm (3.1 in) of rainfall, spread across 6 days, providing a refreshing contrast to the otherwise sunny atmosphere. The humidity levels hover around 52%, contributing to the lush, verdant landscapes that make Iguazu a breathtaking destination. Perfect for explorers seeking to experience nature's beauty at its peak!
In September, Puerto Iguazu begins to feel the warmth of approaching spring, with temperatures reflecting a pleasant transition. The minimum temperature rises to 9°C (49°F), while the average settles at a comfortable 23°C (74°F). Days can be quite warm, peaking at a maximum of 39°C (102°F), reminiscent of the sweltering summer months ahead. This month marks a shift from the cooler winter temperatures, making it an ideal time for outdoor exploration and enjoying the region's breathtaking natural beauty. As you venture into September, expect a delightful climate that encourages discovery and excitement.
In September, Puerto Iguazu experiences a modest precipitation amount of 78 mm (3.1 in), falling slightly behind the average for the preceding months. This month marks a transition towards the wetter season, with 6 days of rainfall, mirroring the consistent downpours seen earlier in the year. Notably, September’s precipitation is an uptick from the drier months of July and August, which recorded only 43 mm (1.7 in) and 76 mm (3.0 in), respectively. As the region gears up for the heavier rains of October, this gradual increase hints at the lush greenery and vibrant ecology that define Iguazu's stunning landscape.
September in Puerto Iguazu, Argentina, marks a subtle transition in humidity levels as the city begins to shake off the dry air of winter. At 52%, the humidity is noticeably higher than the previous two months, yet still remains comfortable compared to the sweltering summer months. This mild increase sets the stage for the wet season ahead, hinting at the lush greenery that is characteristic of the region. As the year progresses from September, humidity levels will steadily climb, peaking in December at a humid 85%—a reminder of the vibrant, tropical climate that defines Puerto Iguazu. The seasonal ebb and flow of humidity not only shapes the weather but also enhances the enchanting beauty of the area's waterfalls and rainforests.
As September rolls into Puerto Iguazu, the UV Index reaches 10, categorizing it as very high and indicating a burn time of just 15 minutes. This marks a continuation of the trend from the previous months, where UV levels begin to stabilize after the intense extremes of mid-year, notably 15 in both January and February. While a slight dip occurs in April to a 10, the levels remain significantly elevated through September, reflecting the region's ongoing exposure to strong sunlight. As October approaches, expect the UV Index to escalate to 13, suggesting the importance of UV protection remains critical during this transitional period. Staying informed about the Puerto Iguazu UV Index is essential for safe outdoor activities—find out more here.
UV Risk Categories
As September unfolds in Puerto Iguazu, it brings a delightful blend of sunshine, accumulating 278 hours of radiant daylight. This month maintains a delightful consistency seen in the previous months, with a slight dip from the peak summer sun of February and March, each basking in 310 hours of light. Following a gradual decrease from the sunnier stretches of January through August, September marks a transition towards the vibrant spring that lies ahead, foreshadowing October’s similar luminosity. Notably, as the year progresses, sunshine hours tend to surge once more by November, promising an exuberance that culminates in December's peak brilliance with 351 hours. This gradual ebb and flow of sunlight not only enhances the breathtaking views of waterfalls but also enriches the overall experience of this stunning destination.
September in Puerto Iguazu, Argentina, offers a moderate 59% chance of sunny weather, marking a shift towards more favorable conditions as the region transitions from winter to spring. This month stands out against the cooler, cloudier months of June (46%) and July (67%), reflecting an upward trend in sunshine that gains momentum through late winter. While September's likelihood of sunshine is slightly lower than the sunny peaks of February (67%) and April (62%), it provides a promising backdrop for outdoor adventures. As you plan your visit, expect a pleasant blend of warmth and light, making it a delightful time to explore the natural beauty of Iguazu Falls.
As September unfolds in Puerto Iguazú, Argentina, the transition from winter to spring is marked by a steady return of daylight, offering approximately 11 hours of sunlight. This month sees a slight increase compared to the shorter days of winter, echoing the gradual lightening trend that begins in August. Following the pattern of the preceding months, daylight duration will continue to grow, reaching 12 hours by October and peaking at 13 hours in the summer months of November and December. The rhythmic shift in daylight not only signals the changing seasons but also invites residents and visitors alike to enjoy more time outdoors, soaking in the natural beauty of this vibrant destination.
As September arrives in Puerto Iguazu, Argentina, the breezes begin to pick up, ushering in a subtle yet noticeable increase in wind speed. With an average of 2.9 m/s (6 mph), the winds this month outpace the preceding months, which hovered around 2.5 m/s throughout the cooler winter period. This gentle rise in wind strength not only enhances the vibrancy of the landscape but also signals a shift towards the warmer months ahead. As the air becomes a bit more animated, visitors can savor the invigorating atmosphere that complements the region's stunning natural beauty, paving the way for a memorable experience filled with both excitement and serenity.
Weather in Puerto Iguazu varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Puerto Iguazu, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January present contrasting weather conditions. In September, temperatures range from a low of 9°C (49°F) to an average of 23°C (74°F), with a maximum reaching 39°C (102°F). This month sees about 78 mm (3.1 in) of precipitation over approximately 6 days, accompanied by a humidity level of 52%. In stark contrast, January offers a warmer climate with minimum temperatures of 16°C (62°F) and an average of 27°C (80°F), while still hitting highs of 39°C (102°F). However, it experiences significantly more precipitation at 154 mm (6.1 in) over 16 days, coupled with increased humidity at 82%. For those considering a visit during January, you can find more details here: Puerto Iguazu weather in January.
In September, the weather features a wide temperature range with minimums around 9°C (49°F) and maximums reaching up to 39°C (102°F), resulting in an average of 23°C (74°F). This month experiences less precipitation, totaling 78 mm (3.1 in) over about 6 days, and the humidity stands at a moderate 52%. In contrast, February offers warmer temperatures, with minimums of 15°C (59°F), an average of 26°C (79°F), and a maximum of 37°C (98°F). The precipitation increases to 111 mm (4.4 in) spread over 11 days, accompanied by higher humidity levels at 79%. For more details on the weather conditions in February, you can visit Puerto Iguazu weather in February.
In comparing the weather of September and March, September generally experiences milder temperatures, with minimums around 9°C (49°F) and maximums reaching up to 39°C (102°F). In contrast, March tends to be warmer overall, with minimum temperatures starting at 13°C (55°F) and maximums peaking at 36°C (97°F). Additionally, September has an average precipitation of 78 mm (3.1 in) over about 6 days, while March sees increased rainfall, totaling 121 mm (4.8 in) across approximately 11 days. This results in higher humidity in March (75%) compared to September's 52%. For a more detailed look into March weather specifically, you can check Puerto Iguazu weather in March.
September and April present distinct weather patterns, with September generally enjoying warmer temperatures. In September, temperatures range from a minimum of 9°C (49°F) to a maximum of 39°C (102°F), averaging around 23°C (74°F). In contrast, April sees slightly cooler conditions, with temperatures ranging from 8°C (47°F) to a maximum of 35°C (95°F) and an average of 22°C (73°F). Precipitation levels are higher in April, totaling 105 mm (4.1 in) over 6 rainy days, compared to September’s 78 mm (3.1 in) over the same number of days. Humidity is also more pronounced in April at 74% compared to September's 52%. For a detailed look at April weather specifics, check out Puerto Iguazu weather in April.
When comparing the weather between September and May, it is clear that September tends to be warmer, with average temperatures reaching 23°C (74°F) and highs soaring up to 39°C (102°F). In contrast, May features cooler temperatures, with an average of 19°C (67°F) and a maximum of 33°C (91°F). Additionally, May experiences significantly higher precipitation levels, totaling 149 mm (5.9 in) over approximately 10 days, while September sees only 78 mm (3.1 in) across about 6 days. Moreover, humidity levels are notably higher in May at 75% compared to September's 52%. For more detailed insights, you can check Puerto Iguazu weather in May.
When comparing the weather in September to that of June, we see notable differences in temperature and precipitation. In September, temperatures range from a minimum of 9°C (49°F) to a maximum of 39°C (102°F), with an average of 23°C (74°F), reflecting a warmer climate overall. In contrast, June is cooler, with a minimum of 2°C (36°F), an average of 18°C (64°F), and a maximum of 30°C (87°F). Additionally, September experiences less rainfall, with 78 mm (3.1 in) over 6 days, while June receives 146 mm (5.7 in) over 9 days, making it a wetter month. The humidity also varies, being lower in September at 52% compared to 70% in June. For more detailed information, check out Puerto Iguazu weather in June.
September's weather tends to be warmer and more variable compared to July. With a minimum temperature of 9°C (49°F) and an average high reaching 39°C (102°F), September experiences a broader range of temperatures, whereas July's temperatures are milder, ranging from a minimum of 1°C (34°F) to a maximum of 30°C (87°F). Rainfall in September is also more substantial, totaling 78 mm (3.1 in) over six days, compared to July's 43 mm (1.7 in) on the same number of days. Additionally, September has slightly lower humidity at 52%, compared to July's 61%. For more specific insights into July weather in the region, you can refer to Puerto Iguazu weather in July.
In September, the weather warms up significantly compared to August, with average temperatures rising from 19°C (66°F) to 23°C (74°F), and maximum temperatures reaching as high as 39°C (102°F). While both months experience a similar amount of precipitation, with September at 78 mm (3.1 in) and August at 76 mm (3.0 in), the humidity in September is slightly higher at 52%, compared to August's 49%. This change in temperature and humidity highlights the transition into a warmer season. For more detailed information, you can check Puerto Iguazu weather in August.
In comparing September and October's weather, we see a notable shift in both temperature and precipitation. September features a minimum temperature of 9°C (49°F) and an average of 23°C (74°F), while October sees a rise with a minimum of 12°C (53°F) and an average of 24°C (75°F). Despite these relatively minor changes in temperature, October does bring increased humidity, rising from 52% in September to 55%. More significantly, precipitation nearly doubles from 78 mm (3.1 in) over six days in September to 171 mm (6.7 in) across twelve days in October, indicating a trend towards wetter conditions as the month progresses. For further details, you can visit Puerto Iguazu weather in October.
September and November present distinct weather characteristics, reflecting the transition into warmer months. In September, temperatures range from a minimum of 9°C (49°F) to an average of 23°C (74°F), with highs reaching up to 39°C (102°F). The month sees around 78 mm (3.1 in) of precipitation over approximately 6 days, accompanied by a humidity level of 52%. Conversely, November experiences slightly warmer conditions, with minimum temperatures of 14°C (58°F) and an average of 25°C (77°F), peaking at 37°C (98°F). The precipitation increases to 118 mm (4.7 in) across 9 days, resulting in higher humidity at 73%. Therefore, while both months feature warm weather, November is characterized by increased humidity and rainfall. For more detailed information, visit Puerto Iguazu weather in November.
In September, temperatures in Puerto Iguazu range from a minimum of 9°C (49°F) to a maximum of 39°C (102°F), with an average of 23°C (74°F). The month experiences 78 mm (3.1 in) of precipitation over approximately 6 days, leading to an average humidity of 52%. In contrast, December sees warmer temperatures, with a minimum of 14°C (58°F) and a maximum of 38°C (100°F), averaging 26°C (79°F). However, this month is also wetter, receiving 155 mm (6.1 in) of rainfall over 11 days, resulting in higher humidity levels at 85%. For more details, you can check Puerto Iguazu weather in December.
As September unfolds in Puerto Iguazu, it marks a transition into spring, bringing milder temperatures and a refreshing ambiance that sets it apart from the hotter summer months. With an average temperature of 23°C, the weather is pleasantly warm, making it an ideal time for exploring the lush landscapes and stunning waterfalls without the intense heat often found later in the year. While rainfall is present, with about six wet days, the overall humidity remains manageable at 52%, ensuring a comfortable experience for visitors. This unique blend of warmth and rainfall not only revitalizes the surrounding nature but also enhances the beauty of the falls during this vibrant season. For more in-depth details about weather patterns, be sure to check out Puerto Iguazu Climate.