Last updated: August 21, 2025
Experience the vibrant May weather of Foz do Iguaçu, Brazil, where temperatures can rise to a maximum of 33°C (91°F), offering plenty of warmth and sunshine. The average temperature settles at a comfortable 19°C (67°F), while the cooler nights drop to 6°C (44°F), providing a refreshing contrast. Be prepared for some wet days, as May sees approximately 149 mm (5.9 in) of rain over 10 days, contributing to a lush, tropical landscape. With humidity levels hovering around 75%, the air carries a sense of vibrant freshness, making this a dynamic time to explore the natural wonders of the region.
May in Foz do Iguacu signals the transition into cooler temperatures, with a noteworthy drop from the warmer months. The average temperature hovers around 19°C (67°F), providing a pleasant atmosphere for exploring the stunning landscapes and attractions. Nights cool down to a chillier 6°C (44°F), a sharp contrast to the highs of 33°C (91°F) during the day. This month shows a clear shift as it bridges the warmth of summer with the approaching winter, making it an ideal time for visitors to enjoy the breathtaking Iguazu Falls without the oppressive heat. Overall, May offers a delightful respite, characterized by mild days and cooler evenings that enhance the area's natural beauty.
May in Foz do Iguaçu brings a notable increase in precipitation, with 149 mm (5.9 in) of rain spread over approximately 10 days. This places it among the wetter months of the year, following a dip in April's rainfall. The trend reflects a gradual buildup of moisture leading into the wetter season, as both May and the following month, June, similarly see high precipitation amounts—146 mm (5.7 in)—indicating the region's climatic character as it transitions from the drier April. As spring gives way to winter, expect a lush landscape, with the vibrant environmental shifts displayed prominently through increased rainfall, setting the stage for a rich biodiversity in this stunning Brazilian locale.
In May, Foz do Iguaçu experiences a mild humidity level of 75%, slightly higher than the preceding months of April and March. This level reflects a gradual decline from the peaks seen earlier in the year, particularly during the sweltering summer months of January and February, when humidity soared to 82% and 79% respectively. As the region transitions toward winter, humidity continues its downward trend, reaching a low of 61% by July. This creates a comfortable atmosphere for visitors looking to explore the stunning natural beauty of the falls without the oppressive heat and humidity of earlier months. Thus, May strikes a balance, offering a pleasant environment while hinting at the drier months ahead.
As you explore the stunning landscapes of Foz do Iguaçu in May, it's essential to be mindful of the UV Index, which registers at a high level of 7 this month. This signifies a notable decrease from the extreme values experienced earlier in the year, such as January and February where the UV Index peaked at 15. In May, the recommended burn time extends to 25 minutes, allowing for a bit more outdoor enjoyment while still emphasizing the need for sun protection. The trend throughout the months reveals a gradual decline in UV intensity, moving from extreme categories to high levels as winter approaches. Visitors are encouraged to stay informed about UV levels for a safe and enjoyable experience; more details can be found at Foz do Iguacu UV Index.
UV Risk Categories
May in Foz do Iguaçu brings a delightful balance of sunshine, with an impressive 253 hours of sun illuminating the landscape. As the month unfolds, it maintains a consistent brightness, standing out in a spring season that sees a gradual decline in hours from the peak brightness of November and December. While January and February offer a generous 252-310 hours, May seems to bridge the gap between the sun-soaked summer months and the cooler, cloudier days of winter. This trend underscores Foz do Iguaçu's charming climate, where each month offers its own unique blend of light, setting the stage for spectacular views of the Iguaçu Falls against a shining backdrop.
In Foz do Iguacu, the month of May offers a promising 63% chance of sunny weather, making it a delightful time to explore the stunning landscapes and natural wonders. As we transition from the wetter months of early year, the likelihood of sunshine demonstrates a steady increase from January's modest 28% to a more inviting 62% in April. May’s favorable weather is complemented by June’s dip to 46%, highlighting May as one of the last opportunities for bright skies before the cooler months set in. This trend of fluctuating sunshine peaks and valleys hints at a vibrant climate, making May an ideal time for visitors seeking both adventure and picturesque vistas in this enchanting Brazilian locale.
In Foz do Iguaçu, Brazil, daylight duration showcases a captivating seasonal rhythm that reflects the changing months. As the year begins, residents enjoy up to 13 hours of daylight in January, which gradually decreases to 10 hours by May, marking the transition into the cooler months. This decrease continues through June and July, where daylight remains stable at 10 hours, before beginning to extend again in August. By September, daylight increases slightly back to 11 hours, before reaching 12 hours in October, and eventually returning to 13 hours by November and December. This cyclical pattern highlights the dynamic interplay of seasons, inviting both locals and visitors to enjoy the unique charms each month brings.
In May, Foz do Iguaçu experiences a gentle average wind speed of 2.4 m/s (5 mph), slightly lower than the preceding month. As the year transitions from the more blustery conditions of early autumn, the winds start to mellow, hinting at the approach of winter. April's winds averaged a bit stronger at 2.5 m/s, but May maintains a comfortably calm breeze, reflective of the region's overall trend of moderate winds throughout the year. Interestingly, wind speeds generally show a subtle increase during the mid-year months of June and July, suggesting a brief resurgence before gradually tapering off again. This cyclical pattern provides not only a pleasant outdoor experience but also complements the breathtaking natural beauty of the area.
Weather in Foz do Iguacu varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Foz do Iguacu, focusing on differences in temperature, rainfall, humidity, and UV levels.
In comparing the weather between May and January, we observe distinct differences in temperature and precipitation. May experiences a broader temperature range with minimums of 6°C (44°F) and maximums of 33°C (91°F), averaging around 19°C (67°F). It also sees 149 mm (5.9 in) of rainfall over approximately 10 days and has a humidity level of 75%. In contrast, January is warmer overall, with minimum temperatures of 16°C (62°F) and maximums soaring to 39°C (102°F), resulting in an average temperature of 27°C (80°F). The month receives slightly more rainfall at 154 mm (6.1 in) spread over 16 days, along with higher humidity at 82%. For a closer look at the specifics of January weather, you can check Foz do Iguacu weather in January.
When comparing the weather in May and February, it is clear that February tends to be warmer overall. February's minimum temperature is significantly higher at 15°C (59°F) compared to May's 6°C (44°F), and it sees average highs reaching up to 37°C (98°F), making it the hotter month. However, May offers a more moderate average temperature of 19°C (67°F) with maximums that can reach 33°C (91°F). Precipitation in May is slightly higher at 149 mm (5.9 in) over about 10 days, while February experiences a bit less rain at 111 mm (4.4 in) across 11 days. Both months have relatively high humidity levels, with February at 79% and May at 75%. For more detailed information on February weather specifically, check out the link: Foz do Iguacu weather in February.
In comparing the weather of May and March, we see notable differences in temperature and precipitation. May features a broader temperature range, with minimums at 6°C (44°F) and maximums reaching up to 33°C (91°F), while March remains warmer, with temperatures ranging from a minimum of 13°C (55°F) to a maximum of 36°C (97°F). Although May receives slightly more rainfall, totaling 149 mm (5.9 in) over 10 days, March comes close with 121 mm (4.8 in) over 11 days. Both months maintain a consistent humidity level of 75%, contributing to a moist atmosphere. For a closer look at March weather specifics, you can visit Foz do Iguacu weather in March.
In comparing the weather between April and May, we see notable differences in temperature and precipitation patterns. April, with a minimum temperature of 8°C (47°F) and an average of 22°C (73°F), reaches a maximum of 35°C (95°F), indicating warmer overall conditions compared to May’s minimum of 6°C (44°F) and average of 19°C (67°F), which peaks at 33°C (91°F). Additionally, April experiences less rainfall, totaling 105 mm (4.1 in) over just 6 days, while May is wetter with 149 mm (5.9 in) across 10 days, resulting in slightly higher humidity levels at 75%. For more detailed insights into the weather during this month, you can check Foz do Iguacu weather in April.
In comparing the weather between May and June, we see some notable differences. May experiences a broader temperature range with a minimum of 6°C (44°F) and a maximum of 33°C (91°F), averaging 19°C (67°F). In contrast, June has lower minimum temperatures, dropping to 2°C (36°F), with a slight decrease in the average to 18°C (64°F) and a maximum of 30°C (87°F). Precipitation levels are fairly similar, with May receiving 149 mm (5.9 in) over 10 days and June having 146 mm (5.7 in) across 9 days, slightly less humid than May at 70% compared to May's 75%. For more detailed insights, check Foz do Iguacu weather in June.
May and July exhibit contrasting weather patterns. In May, temperatures range from a minimum of 6°C (44°F) to a maximum of 33°C (91°F), with an average of 19°C (67°F). May also experiences significant precipitation of 149 mm (5.9 in) over about 10 days, accompanied by high humidity levels of 75%. In contrast, July presents cooler temperatures, with a minimum of 1°C (34°F) and a maximum of 30°C (87°F), averaging 17°C (63°F). Precipitation drops sharply to 43 mm (1.7 in) across only 6 days, and humidity decreases to 61%. For more details, you can check Foz do Iguacu weather in July.
May and August showcase distinct weather patterns, reflecting the transitional phases of spring and summer. In May, temperatures fluctuate between a minimum of 6°C (44°F) and a maximum of 33°C (91°F), with an average of 19°C (67°F). This month experiences considerable precipitation, totaling 149 mm (5.9 in) over approximately 10 days, accompanied by high humidity levels at 75%. In contrast, August features slightly cooler temperatures, with a minimum of 3°C (38°F) and a maximum of 34°C (94°F), yet maintains a similar average of 19°C (66°F). The overall precipitation in August is significantly lower at 76 mm (3.0 in) across just 6 days, resulting in a much drier atmosphere with humidity dropping to 49%. For more detailed information, you can visit Foz do Iguacu weather in August.
May and September exhibit distinct differences in weather patterns. In May, temperatures range from a minimum of 6°C (44°F) to a maximum of 33°C (91°F), with an average temperature of 19°C (67°F). This month experiences considerable precipitation of 149 mm (5.9 in) over about 10 days, coupled with high humidity levels around 75%. In contrast, September sees milder conditions with minimum temperatures of 9°C (49°F) and maximums reaching up to 39°C (102°F). The average temperature rises to 23°C (74°F), and precipitation significantly decreases to 78 mm (3.1 in) over only 6 days, resulting in a lower humidity of 52%. For more detailed insights, check Foz do Iguacu weather in September.
In May, temperatures in Foz do Iguacu range from a mild 6°C (44°F) to a warm 33°C (91°F), with an average of 19°C (67°F). The month sees around 149 mm (5.9 in) of precipitation over approximately 10 days, contributing to a high humidity level of 75%. In contrast, October experiences slightly higher temperatures, with minimums of 12°C (53°F) and maximums reaching up to 40°C (103°F), averaging 24°C (75°F). Precipitation increases to 171 mm (6.7 in) over 12 days, but humidity drops significantly to 55%, making October feel less muggy than May. For more detailed weather trends, check out Foz do Iguacu weather in October.
In comparing May and November, we see notable differences in weather patterns. May experiences a wider range of temperatures, with minimums dropping to 6°C (44°F) and maximums peaking at 33°C (91°F), while the average temperature sits around 19°C (67°F). In contrast, November tends to be warmer overall, with minimums at 14°C (58°F) and maximums soaring up to 37°C (98°F), resulting in a higher average of 25°C (77°F). Precipitation is fairly comparable, with May receiving 149 mm (5.9 in) over 10 days and November slightly less at 118 mm (4.7 in) over 9 days. Humidity levels are also similar, with May at 75% and November at 73%. For more detailed information, you can check Foz do Iguacu weather in November.
May and December present distinct weather experiences. In May, temperatures range from a minimum of 6°C (44°F) to a comfortable average of 19°C (67°F), with maximums reaching 33°C (91°F). The month sees about 149 mm (5.9 in) of precipitation spread over 10 days, paired with a humidity level of 75%. In contrast, December offers warmer temperatures, with a minimum of 14°C (58°F), an average of 26°C (79°F), and highs soaring up to 38°C (100°F). The precipitation increases slightly to 155 mm (6.1 in) over 11 days, while humidity rises to 85%. For a more detailed look at what to expect, check out Foz do Iguacu weather in December.
As May rolls around in Foz do Iguaçu, the weather offers a unique blend of warmth and refreshing coolness. While temperatures can reach the high thirties during the day, the evenings often bring a pleasant chill that is a welcome contrast to the hotter months preceding it. With an average temperature hovering around a comfortable 19°C, May marks a transition into a milder climate, setting the stage for the lush landscapes that this region is renowned for. However, the month does see some rainfall, with precipitation occurring on about ten days, contributing to the area's stunning natural beauty. The 75% humidity can make it feel quite tropical, but this moisture also nourishes the vibrant flora around Foz do Iguaçu, making it an ideal time for outdoor exploration. For more detailed insights into this beautiful region's weather patterns, check out Foz do Iguacu Climate.