Weather in Goiânia

Rain is the monsoon runs from October to April, inside an annual total of 1399 mm. The wettest month is January at 239 mm; the driest is July at 4 mm.

Goiânia is in Brazil at 16.7°S. The 2001–2020 NASA POWER daily record describes a monsoon climate with a sharp wet-dry split. September is the warmest month (average 26.8°C, high 34.1°C) and June is the coolest (average 20.9°C, low 14.4°C). On this site the months that score closest to a 22°C day, lighter rain, and moderate humidity are June, July, and August.

When Goiânia gets wet

The monsoon in Goiânia starts in October and ends in April (October, November, December, January, February, March, and April). January is the core of it at 239 mm. July is the other extreme, with 4 mm.

Humidity peaks near 83%. That usually lines up with the wetter months rather than the hottest ones.

How warm Goiânia gets

Monthly average highs run from 27.3°C in June to 34.1°C in September. Nights follow the same curve: 14.4°C in June and 19.5°C in September.

Across the year the mean afternoon high is 29.1°C. If you want the smallest day–night shock, look at months where the high and low sit close together; September nights still hold 19.5°C.

Distinctive months in Goiânia

January is the wettest month — 239 mm and 25 rainy days, with 82% humidity. April closes the monsoon: 109 mm over 15 rainy days, then the calendar dries. May: 26.7°C high, 15.4°C low, 24 mm rain, 77% humidity. The year bottoms out in June. Plan for 14.4°C at night and 27.3°C in the afternoon.

July is the driest month, averaging only 4 mm across 1 rainy days. Highs sit near 29.0°C. Peak heat arrives in September: 34.1°C by day, 19.5°C at night, and 43% humidity. The monsoon opens in October. Expect 122 mm and 17 rainy days, with nights around 20.4°C. November stands apart from the months beside it: 29.3°C / 19.7°C and 194 mm.

When the score favours a visit

The three months with the highest comfort score are June, July, and August: June (20.9°C average, 6 mm, 68% humidity); July (21.7°C average, 4 mm, 57% humidity); August (24.2°C average, 8 mm, 44% humidity). They fall in calendar order. The score rewards averages near 22°C, lower rainfall, and humidity near 60%. It is a climate score, not a festival or price calendar.

If you want the monsoon itself — fewer crowds, greener landscape, heavier rain — aim at October–April instead of the score.

Goiânia and other cities in Brazil

Brasília is about 173 km away: Goiânia is 1.2°C warmer than Brasília in its hottest month and 95 mm wetter over the year than Brasília. Brasília’s wettest month is December (221 mm) versus January here.

Belo Horizonte is about 667 km away: Goiânia is 3.9°C warmer than Belo Horizonte in its hottest month and 188 mm wetter over the year than Belo Horizonte. Belo Horizonte’s wettest month is December (266 mm) versus January here.

Guarulhos is about 806 km away: Goiânia is 3.4°C warmer than Guarulhos in its hottest month and a similar annual rainfall (1379 mm in Guarulhos). Guarulhos’s wettest month is January (228 mm) versus January here.