John Gill
And when ye see the south wind blow,.... From the hot countries of Egypt, Ethiopia, and Arabia, which lay south of Judea: ye say there will be heat; or hot sultry weather, scorching heat, which such a wind brings with it: and it cometh to pass; generally speaking, as is asserted.
Matthew Henry
In this chapter we have divers excellent discourses of our Saviour's upon various occasions, many of which are to the same purport with what we had in Matthew upon other the like occasions; for we may suppose that our Lord Jesus preached the same doctrines, and pressed the same duties, at several times, in several companies, and that one of the evangelists took them as he delivered them at one...