Rio Tercero's climate is characterized by mild winters and hot, humid summers. In winter, the coldest months are May and June, with temperatures ranging from -4°C to 30°C, making it a cool season. Spring and autumn are relatively mild, with average temperatures in April and September around 21°C and 18°C respectively. Summer is hot, with temperatures frequently reaching above 35°C in November and December, while January and August experience some of the hottest days of the year. The temperature fluctuations between day and night are significant throughout the year, with significant diurnal variations.