Climate Insights for Itanhaém

The climate in Itanhaém is warm and mild. The average annual temperature is 21°C and approximately 2028mm of precipitation falls per year. January is the wettest month, receiving around 303mm of rainfall. Itanhaém 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: February, April, March. The coldest months are June, July, August, when temperatures can drop to 13°C.

Itanhaém sees moderate temperature variation throughout the year, ranging from 13°C to 29°C. The warmest month is February, when average highs reach 29°C and the mean temperature sits around 26°C. June is the coolest month, with minimum temperatures around 13°C and an average of 16°C. Daily temperature variation is modest, with an average difference of 6°C between highs and lows. The sharpest temperature change occurs between April and May, with a 5°C shift in average temperatures.

Itanhaém is a very wet location, receiving approximately 2028mm of precipitation annually, which averages out to around 169mm per month. The wettest month is January, averaging 303mm of rainfall. February and March also tend to see above-average precipitation. The driest month is July, with just 21mm. That's 282mm 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.

Itanhaém 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 October, averaging 3km/h, though still comfortable for most outdoor activities. The calmest conditions occur in June, with average winds dropping to 2km/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 Itanhaém, which began on June 21, 2026. Itanhaém 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 February at around 29°C, while the coldest stretch bottoms out in June near 13°C. Spring is next, beginning on September 23, 2026 — 63 days from now.

The best time to visit Itanhaém is during April, July and September, when the weather is most comfortable for travellers. During these months, average temperatures hover around 20°C with modest rainfall averaging 51mm per month. By contrast, February can be uncomfortably hot with highs reaching 29°C, while June is the coldest period with lows dropping to 13°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 Itanhaém 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.