There is no definitive answer to this question as it depends on a number of factors, including the time of year and the specific location within a continent. However, generally speaking, the continents closest to the equator tend to be the hottest, with Africa and South America typically being considered the hottest continents.
The Sahara Desert is located in Africa and is one of the hottest places on Earth. The average temperature in summer can exceed 40°C (104°F), and temperatures above 50°C (122°F) are not uncommon. In fact, temperatures above 60°C (140°F) have been recorded in some parts of the Sahara.
South America also has some very hot areas, particularly around its northern tip where Venezuela and Colombia meet. The city of Cali in Colombia has an average temperature of 26°C (79°F), but it can often reach 38-40°C (100-104°F) during heatwaves. Similarly, Caracas in Venezuela experiences an annual average temperature of 26°C (79 °F), but highs of up to 43 °C (109 °F) are not uncommon during periods of extreme heat.
So while there is no definitive answer to which continent is the hottest overall, Africa and South America would be considered among the contenders for that title.