Climate Insights for Itatiaia

The climate in Itatiaia is warm and mild. The average annual temperature is 20°C and approximately 2220mm of precipitation falls per year. Itatiaia receives a notable amount of rainfall throughout the year, including during its driest month. Itatiaia 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, February, March. The coldest months are July, August, June, when temperatures can drop to 11°C.

Itatiaia sees moderate temperature variation throughout the year, ranging from 11°C to 27°C. The warmest month is January, when average highs reach 27°C and the mean temperature sits around 23°C. July is the coolest month, with minimum temperatures around 11°C and an average of 16°C. On average, daily temperatures fluctuate by about 9°C between overnight lows and afternoon highs. The sharpest temperature change occurs between August and September, with a 3°C shift in average temperatures.

Itatiaia is a very wet location, receiving approximately 2220mm of precipitation annually, which averages out to around 185mm per month. The wettest month is December, averaging 363mm of rainfall. January and February also tend to see above-average precipitation. The driest month is July, with just 31mm. That's 332mm 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.

Itatiaia 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 September, averaging 8km/h, though still comfortable for most outdoor activities. The calmest conditions occur in March, with average winds dropping to 7km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 1km/h between the calmest and windiest months.

It is currently autumn in Itatiaia, which began on March 20, 2026. Itatiaia 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 27°C, while the coldest stretch bottoms out in July near 11°C. Winter is next, beginning on June 21, 2026 — 88 days from now.

The best time to visit Itatiaia is during May, June, July, August and September, when the weather is most comfortable for travellers. During these months, average temperatures hover around 18°C with modest rainfall averaging 58mm per month. By contrast, January can be uncomfortably hot with temperatures reaching 27°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.

The table below shows monthly climate averages for Itatiaia 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.