Sweltering heats refer to the uncomfortably hot weather conditions that people often find unbearable. There are several synonyms for this common expression, which include scorching temperatures, sultry heat, torrid weather, oppressive heat, and blazing sun. These synonyms have the same meanings as sweltering heat and can be used interchangeably depending on the context. In some cases, people may refer to extremely hot weather conditions as a heatwave or a hot spell. Whatever expression is used, the associated implication is that the weather is too hot for comfort and often requires measures to keep cool.