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February is the better half of the Brazilian summer here: January is the national holiday month and busier, so mid-February runs calmer - except at Carnival, which moves with the calendar and brings traffic to the beaches, higher prices and the city's own street parties with it. Check where it falls in your year. Regulars are firm that this is the right season weather-wise and our row mostly agrees: 30.2C reading as 35C at 80 percent humidity, nights at 21.9C, a 26.7C sea. The part visitors worry about is real - 191.4mm across 19.5 days - but it arrives as a summer downpour rather than a wet season, with 9.9 hours of sun a day standing behind it. The record: an 11.5 kph wind and AQI 38.

March is when Floripa hands the island back. The forum's picture of the late part of the month is fewer tourists, warm days and noticeably cooler nights, with March through May named as the favourite stretch precisely because the December-to-February crush has gone. It is a transition rather than a clean season change, and our own row is the reminder: 19.8 precipitation days carrying 155.9mm, so this is still the wet half of the year and a week can go either way. The rest: 29.2C days that feel like 33C, 21.2C nights, humidity 81 percent, 9.2 hours of sun and a 27.4C sea.

Florianópolis's forum rates March-April-May as favorite months — still hot by day, around 27°C, cooling to a comfortable 20°C at night, with far fewer crowds than peak summer. Regulars note rain picks up compared to March, so a light rain jacket is worth packing, and flag late April evenings as starting to turn genuinely cooler as the month wears on.

Florianopolis-forum threads on July weather are consistent it's the wrong month for beach time - genuinely cold by local standards, cool enough that even committed surfers describe both the water and the air as chilly rather than inviting. Days do bring clear, sunny skies more often than not, since July is called one of the drier months of the year here, any rain that shows up typically brief rather than settling in. The one activity regulars specifically recommend for a July visit regardless of the cool temperatures: whale watching, with southern right whales reliably spotted in the bays off the island this time of year, boat tours running from Praia da Armação or the peninsula ferry crossing. Surf conditions stay strong too, good swells and offshore winds, just paired with water cold enough that a proper wetsuit is non-negotiable. The record: 21.9C days feeling like 22C, 13.1C nights, 56mm across 6.5 days, 82 percent humidity, an 18.6C sea and 7.6 hours of sun.

Forum posters describe September-October as already warming up but genuinely windy across the island, with the wetter stretch of the year running roughly August through late October or early November. Posters are candid that predicting exactly which specific days will bring rain versus wind versus sun is difficult this time of year, calling it a genuinely transitional spring period rather than settled beach weather. One practical upside repeatedly mentioned: with more than 40 beaches spread around the island's different coastlines, posters say there's almost always a sheltered spot to escape whichever direction the wind is blowing on a given day. Posters consistently name November - once the windy fall transition finishes - as when the beach season properly opens, positioning October as a genuine shoulder month rather than peak conditions.

Regulars are specific this month opens the beach season proper after a windy fall, temperatures commonly cited in the low-to-mid 70s Fahrenheit, though predicting any single day stays genuinely hard given how quickly conditions can shift. Our row backs that warm, genuinely wet and windy read, 26.2C reading as a hot 29C, over 18.8C nights feeling 21C, with a substantial 148mm of rain across 16.7 days and a real 13.8 kph wind. Regulars are consistent the island's 40-plus beaches are a real practical advantage on a windy day, always another beach somewhere on the island sheltered enough to be comfortable. The sea sits at a warm, swimmable 23.7C. The record: 8.8 hours of sun, humidity 79 percent and AQI 42.

December on Floripa is hot and wetter than the brochure - our row carries 186.9mm across 19.6 precipitation days, which regulars confirm as quite a bit of rain inside an otherwise very nice month. The crowd advice is precise about dates rather than the month: Brazilians travel late, so the island only fills after Christmas and peaks at New Year, while early December is comparatively calm and January is packed throughout. Prices track the same curve. For space at any point, they send you south - Morro das Pedras for surf, Matadeiro for calm swimming. The record: 28.5C days that feel like 32C, 20.9C nights, humidity 80 percent, 9.8 hours of sun and a 25.7C sea.