Sao Francisco do Sul's climate is characterized by mild winters and warm summers. The winter months of May, June, July, and August bring cooler temperatures, with average highs ranging from 7-17°C. In contrast, the summer months of January to March and November to December are warm to hot, with average high temperatures often reaching above 25°C. Spring (April) and autumn (September to October) see a moderate temperature range, with averages around 20-22°C. The coldest month is July, with an average low of around 3°C.