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Puerto Iguazú's forum is upfront that January is hot, humid, and rainy season - roughly a one-in-three chance of rain on any given day, though posters were clear it doesn't mean rain all day. The genuine upside several regulars pointed to: the falls run at peak water volume this time of year, and an afternoon shower followed by sun tends to produce spectacular rainbows across the 275 individual falls. Boat tour operators hand out dry bags as standard practice, and forum consensus was that the heat and rain risk shouldn't be a reason to skip a January visit.

Puerto Iguazu-forum threads on February conditions are consistent this sits deep within the region's hot, sticky stretch, posters calling humidity itself as much a factor as the raw temperature reading. Regulars describe sun and a sudden downpour as both entirely possible within the same afternoon, the subtropical pattern here shifting fast regardless of forecast. Posters recommend real waterproof gear, a shower able to roll through the walkways with little warning. Regulars call water flow generally strong this time of year, though a heavier system can leave it visibly muddier from red clay soils upstream. Posters recommend March through May for milder, less humid conditions if flexible, February still workable for lush, green surroundings. Regulars call the falls worth the heat and humidity regardless of exact month. The record: 33.1C days feeling like a punishing 38C, 21.4C nights, an extraordinarily high 115.5mm across nearly 12 days and 76 percent humidity.

Puerto Iguazu-forum threads on trip planning for a March visit describe this as still squarely within the wetter season, posters calling afternoon showers a real possibility most days though rarely enough to derail a full day at the falls. Regulars call the water genuinely powerful this time of year, upstream rainfall keeping volume high across the roughly 275 individual falls in the complex. Regulars recommend the boat ride from the Argentine side for anyone wanting to get properly soaked, a dry change of clothes standing advice. Posters describe mosquito activity as a real concern some years, repellent worth packing regardless of any single forecast. Regulars call the Devil's Throat viewpoint genuinely spectacular with this much water moving through it. Posters recommend a full day for the Argentine side alone given how much trail there is. The record: 31.9C days feeling like a punishing 37C, 20.6C nights, 122.3mm across nearly 12 days and 77 percent humidity.

Puerto Iguazu-forum threads on April weather call it a genuinely favorable month, one visitor describing a comfortable Saturday followed by a warmer, more humid Sunday within the same weekend, underscoring how much conditions can shift day to day even in a generally good month. Posters are consistent water flow at the falls depends far more on upstream rain in southern Brazil than on local weather, so a calm local forecast says little about how full the falls will actually run. The subtropical setting means there's no true dry season here, some rain possible in any month, though April is repeatedly named milder and less intense than peak summer. Regulars call April a strong overall pick, cooler than summer without yet reaching the cold snaps that can arrive by midwinter. The record: 28.9C days feeling like a punishing 31C, 18.2C nights, a notably high 126mm across 8.3 days and 77 percent humidity.

Puerto Iguazu-forum threads on May weather call it a genuinely strong shoulder-season month, mild afternoons that stay comfortable for a full day of walking the falls trails without the intense heat of peak summer, though mornings and evenings can feel noticeably cooler. Posters are consistent this sits toward the drier stretch of the year, blue skies fairly likely though a shower on any given day can't be ruled out entirely. Regardless of the forecast, posters are unanimous that visitors get genuinely soaked at the main viewpoints and catwalks purely from spray off the falls themselves, ponchos or a three-dollar plastic cover sold locally standard advice either way. Water levels and crowd numbers are both called favorable in May compared to the busier peak holiday stretches. The record: 25.3C days feeling like 26C, 15C nights, 81 percent humidity and 6.9 hours of sun.

Puerto Iguazu-forum threads on a June visit describe conditions as genuinely fine, posters calling it a little on the cold side but still nice, with a range roughly between thirteen and twenty-two degrees. Regulars call June through August genuinely the coolest, driest stretch of the year here, several posters naming this the reason conditions feel noticeably different from the humid peak season. Posters call water levels a real concern in June specifically, several regulars warning lower flow can make the falls less dramatic than wetter months. Regulars call fewer crowds and comfortable hiking real upsides of a June visit, several threads naming this a fair tradeoff against reduced water volume. Posters recommend checking recent water-level reports if seeing the falls at full force matters most, several regulars calling this standard given how much flow varies. The record: 23.7C days, 13.2C nights, 120.5mm across nearly 9 days and 81 percent humidity.

Forum posters describe July as the start of winter here and generally the driest month of the year, with daytime temperatures in the mid-50s to high-60sF - genuinely cool by local standards, and posters note this actually makes for more comfortable walking around the falls trails compared to the 90-100F heat of peak summer. July and August together bring the lowest water levels at the falls, meaning a slightly less thunderous spectacle than a high-water summer visit, though posters describe all trails staying open and the falls still being spectacular. One visitor reported an unusually cold night with near-freezing temperatures on one July trip, though this was called an outlier rather than the norm. Crowds do pick up somewhat during the two-week July school holiday, but posters are consistent it's nothing like the intensity of the December-January peak.

Puerto Iguazu-forum threads on an early September visit describe water levels as a genuine question mark this time of year, posters comparing conditions against summer footage to gauge whether boat rides under the falls would still be running strong. Regulars call crowds noticeably lighter in early September compared with peak season, a real advantage for anyone prioritizing space at the main viewpoints. Posters recommend two full days as a solid September stay, enough time to properly cover both the Argentine and Brazilian sides of the falls. Regulars call combining a night in Puerto Iguazu with one across the border in Foz do Iguacu a real option, several posters describing exactly this split-stay approach. Posters recommend booking border-crossing transport ahead regardless of exact dates, logistics here considered smoother with a plan in place. The record: 29.5C days feeling like 32C, 16.3C nights, an extraordinarily high 92.2mm across over 8 days and 74 percent humidity.