Climate Insights for Iaçu

The climate in Iaçu is temperate. The average annual temperature is 15°C and approximately 296mm of precipitation falls per year. December is the wettest month, receiving around 33mm of rainfall. Iaçu 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: January, June, February. The coldest months are December, October, November, when temperatures can drop to 10°C.

Iaçu sees moderate temperature variation throughout the year, ranging from 10°C to 21°C. January is the warmest month, though highs remain moderate at 21°C with a mean of 19°C. December is the coolest month, with minimum temperatures around 10°C and an average of 13°C. Daily temperature variation is modest, with an average difference of 3°C between highs and lows. The sharpest temperature change occurs between January and February, with a 3°C shift in average temperatures.

Iaçu is a quite dry location, receiving approximately 296mm of precipitation annually, which averages out to around 25mm per month. The wettest month is February, averaging 33mm of rainfall. March and May also tend to see above-average precipitation. The driest month is August, with just 7mm. That's 26mm less than February, the wettest month. Precipitation varies noticeably between seasons, with the first half (January to June) of the year generally seeing more rainfall.

Iaçu is relatively calm, with an average annual wind speed of 8km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is November, averaging 12km/h, though still comfortable for most outdoor activities. The calmest conditions occur in January, with average winds dropping to 5km/h, making it an ideal period for wind-sensitive activities. Wind speeds vary significantly across the year, with a 7km/h difference between the calmest and windiest months. This level of variation is worth factoring into travel plans.

It is currently winter in Iaçu, which began on June 21, 2026. Iaçu 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 January at around 21°C, while the coldest stretch bottoms out in December near 10°C. Spring is next, beginning on September 23, 2026 (16 days from now).

The best time to visit Iaçu is during January, February, March, April, May, June, July and August, when the weather is most comfortable for travellers. During these months, average temperatures hover around 16°C with modest rainfall averaging 24mm per month. By contrast, December can be quite cold with temperatures dropping to 10°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

The table below shows monthly climate averages for Iaçu 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.