دُعَاءُ نُزُولِ الْمَطَر
Duʿāʾ al-Maṭar — When It Rains
اللَّهُمَّ صَيِّبًا نَافِعًا
Allāhumma ṣayyiban nāfiʿan.
O Allah, (let it be) a beneficial downpour.
Aisha reported: When the Messenger of Allah ﷺ saw rain, he would say, 'O Allah, a beneficial downpour.'
Source: Ṣaḥīḥ al-Bukhārī 1032