Isn't it wheat harvest today? I will call to Yahweh, that he may send thunder and rain; and you shall know and see that your wickedness is great, which you have done in the sight of Yahweh, in asking you a king.
God confirmed the truth of Samuel’s words supernaturally when He sent rain during the wheat harvest, normally the driest period of the year. The rain symbolized the blessing of God for obedience (cf. Deuteronomy 28:12). This storm was a sign that Yahweh was supporting Samuel. However, coming at this time of the year, it proved to be judgmental, since farmers do not appreciate rain during harvests, and a warning of future potential judgment.