Climate Insights for Goiás

The climate in Goiás is hot. The average annual temperature is 25°C and approximately 1721mm of precipitation falls per year. January is the wettest month, receiving around 708mm of rainfall. Goiás is in the Southern Hemisphere. The seasons are reversed — summer runs from December to February, while winter falls between June and August. The summer months are: September, April, August. The coldest months are July, June, August, when temperatures can drop to 18°C.

Goiás sees moderate temperature variation throughout the year, ranging from 18°C to 34°C. The warmest month is September, when average highs reach 34°C and the mean temperature sits around 28°C. July is the coolest month, with minimum temperatures around 18°C and an average of 24°C. On average, daily temperatures fluctuate by about 10°C between overnight lows and afternoon highs.

Goiás is a fairly wet location, receiving approximately 1721mm of precipitation annually, which averages out to around 143mm per month. The wettest month is January, averaging 708mm of rainfall. November and December also tend to see above-average precipitation. The driest month is July, with just 0mm. That's 708mm less than January, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic.

Goiás is relatively calm, with an average annual wind speed of 2km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is August, averaging 2km/h, though still comfortable for most outdoor activities. The calmest conditions occur in February, with average winds dropping to 1km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 1km/h gap between the calmest and windiest months.

It is currently winter in Goiás, which began on June 21, 2026. Goiás is in the Southern Hemisphere, where the seasons are reversed — spring starts in September, summer in December, autumn in March, and winter in June. The warmest period peaks in September at around 34°C, while the coldest stretch bottoms out in July near 18°C. Spring is next, beginning on September 23, 2026 — 63 days from now.

The best time to visit Goiás is during June and July, when the weather is most comfortable for travellers. During these months, average temperatures hover around 24°C with modest rainfall averaging 0mm per month. By contrast, September can be uncomfortably hot with temperatures reaching 34°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

The table below shows monthly climate averages for Goiás based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.