It will rain in abundance in the time of Hazrat Mahdi (as)

He will fill Earth with justice and well-being. The earth gives forth its fruits, and the sky rains. My community will be blessed in a hitherto unseen way. (Al-Muttaqi al-Hindi, Al-Burhan fi Alamat al-Mahdi Akhir az-Zaman, p. 35)

[In Hazrat Mahdi (as)’s time] the sky will begrudge none of its rain and will cause rain to fall generously. The earth will hold back none of its plants and will give them forth to perfection… (Al-Sharani, Mukhtasar Tazkirah al-Qurtubi, p. 437)

During his [Hazrat Mahdi’s (as)] time, both the community’s good and wicked people will be blessed with a blessing, the like of which they have never seen before. Despite the abundance of rain, not a drop will go to waste. The land will grow fruitful and fertile, without demanding a single seed... (Ibn Hajar al-Haythami, Al-Qawl al-Mukhtasar fi `Alamat al-Mahdi al-Muntadhar, p. 20-21)