Weather in Goiânia in December

Shoulder season. December is shoulder season in Goiânia — cheaper, quieter, and a genuine gamble. You should expect rain on 26 days of the month, which is more days wet than dry.

December ranks 9 of 12 in Goiânia: past the worst of the year but short of June, which is the month to book if the dates are open.

Rain on 26 of the month's 31 days, 8 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. Pack for 28.4 °C days and 19.9 °C nights; the spread matters more here than any single number.

What the averages hide

Averages flatten a month, and this one hides a few things: 6 days top 30 °C — hot spells arrive, but they break. Across the twenty years measured, the hottest December day reached 37.6 °C and the coldest night fell to 16.9 °C, and the wettest single day dropped 65 mm — roughly 28% 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 383 mm against 131 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 234 mm average is a reasonable planning figure, not a promise.

Wind is light at 6.3 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 80%, high enough to notice on the warm days without dominating them.

How December sits in the year

Temperatures hold steady either side: 29.6 °C in November, 28.4 here, 28 in January. Nothing about the timing within the month matters much.

Daylight in December

December is at or near the longest days of Goiânia's year: 13.1 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: 19.8 °C between the year's warmest afternoons and coldest nights. At 766 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

Shoulder. The value months — prices ease off and you get the place closer to itself.

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

December in Goiânia versus nearby

If Goiânia is one option among several, the nearby comparison is worth making. Brasília is close enough to be a coin toss — 2.2 °C cooler, 1 day less rain. Belo Horizonte is close enough to be a coin toss — within a degree on temperature, 2 days less rain.

So: December is a compromise. June is 37 points better and is what Goiânia 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 Goiânia

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