Weather in Curitiba in December

A good month. December is a solid month to be in Curitiba. You should expect rain on 22 days of the month, which is more days wet than dry.

December ranks 10 of 12 — near the bottom of Curitiba's year. August is the month that works, and the swing between the two is 21 points, which is a different holiday rather than a slightly better one. Worth keeping in perspective: December is the weakest month of Curitiba's year and it is still a perfectly good one. The downside here is small.

Rain on 22 of the month's 31 days, 6 of them heavy. At that frequency a wet-weather backup is not a contingency, it is the itinerary — book the indoor things first and treat the clear days as the bonus. Nothing specialised needed — this is the month you pack for the trip rather than for the weather.

What the averages hide

Averages flatten a month, and this one hides a few things: 4 days top 30 °C — hot spells arrive, but they break. Across the twenty years measured, the hottest December day reached 33.3 °C and the coldest night fell to 9.2 °C, and the wettest single day dropped 80 mm — roughly 46% of the month's rain in one day.

December is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest December on record still delivered 255 mm against 73 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 173 mm average is a reasonable planning figure, not a promise.

Wind is light at 3.7 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 81%, high enough to notice on the warm days without dominating them.

How December sits in the year

Temperatures hold steady either side: 25.1 °C in November, 26.5 here, 26.4 in January. Nothing about the timing within the month matters much.

Daylight in December

December is at or near the longest days of Curitiba's year: 13.7 hours of daylight, holding steady all month. Evenings are the real gain — dinner outdoors still happens in full light.

An inland climate

Despite being inland, the year stays fairly even: 17.3 °C between the year's warmest afternoons and coldest nights. At 924 m the air is thin enough to matter — sun that burns faster than the temperature suggests, and nights that cool off quickly.

How busy it gets

Quiet. Few other visitors, cheaper rooms, and a real chance some seasonal operators are shut.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

December in Curitiba versus nearby

If Curitiba is one option among several, the nearby comparison is worth making. São Paulo is close enough to be a coin toss — within a degree on temperature, the same number of rain days. Porto Alegre is close enough to be a coin toss — within a degree on temperature, 10 days less rain.

So: December is a compromise. August is 19 points better and is what Curitiba is actually like at its best — worth moving the trip for if that is possible, and worth adjusting expectations for if it is not.

Every month in Curitiba

See all twelve months in Curitiba, or where else to go in December.