Climate Overview
The climate in Santa Helena de Goiás is warm and mild. The average annual temperature is 25°C and approximately 1056mm of precipitation falls per year. December is the wettest month, receiving around 187mm of rainfall. Santa Helena de 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, October, August. The coldest months are July, June, August, when temperatures can drop to 16°C.
Temperature
Santa Helena de Goiás sees moderate temperature variation throughout the year, ranging from 16°C to 35°C. The warmest month is September, when average highs reach 35°C and the mean temperature sits around 28°C. July is the coolest month, with minimum temperatures around 16°C and an average of 22°C. On average, daily temperatures fluctuate by about 11°C between overnight lows and afternoon highs. The sharpest temperature change occurs between August and September, with a 3°C shift in average temperatures.
Precipitation
Santa Helena de Goiás is a moderately rainy area, receiving approximately 1056mm of precipitation annually, which averages out to around 88mm per month. The wettest month is December, averaging 187mm of rainfall. February and January also tend to see above-average precipitation. The driest month is July, with just 1mm. That's 186mm less than December, 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.
Wind
Santa Helena de Goiás is relatively calm, with an average annual wind speed of 11km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is September, averaging 14km/h, though still comfortable for most outdoor activities. The calmest conditions occur in March, with average winds dropping to 9km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 5km/h gap between the calmest and windiest months.
Seasons
87 days until Winter
It is currently autumn in Santa Helena de Goiás, which began on March 20, 2026. Santa Helena de 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 35°C, while the coldest stretch bottoms out in July near 16°C. Winter is next, beginning on June 21, 2026 — 87 days from now.
Spring
Temperatures range from 21 to 35°C. Precipitation is moderate at around 289mm for the season, averaging 96mm per month. Winds are generally light, averaging 12km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 21 to 31°C. Rainfall is heavy, totalling around 540mm across the season with a monthly average of 180mm. Winds are generally light, averaging 10km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 18 to 30°C. Precipitation is moderate at around 214mm for the season, averaging 71mm per month. Winds are generally light, averaging 10km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 16 to 32°C. Precipitation is minimal, with only around 12mm for the entire season. Winds are generally light, averaging 12km/h. A light jacket or sweater is usually sufficient, though cooler evenings may call for an extra layer.
Best Time to Visit
The best time to visit Santa Helena de Goiás is during April, May, June, July and August, when the weather is most comfortable for travellers. During these months, average temperatures hover around 23°C with modest rainfall averaging 18mm per month. By contrast, September can be uncomfortably hot with temperatures reaching 35°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.
Monthly Climate Data
The table below shows monthly climate averages for Santa Helena de 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.
