Ilm-e-Ghayab (Knowledge of Unseen)

Narrated Ibn `Umar: Allah’s Messenger (ﷺ) said: “Keys of the unseen knowledge are five which nobody knows but Allah, nobody knows what will happen tomorrow; nobody knows what is in the womb; nobody knows what he will gain tomorrow; nobody knows at what place he will die; and nobody knows when it will rain.”
عَنِ ابْنِ عُمَرَ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم مِفْتَاحُ الْغَيْبِ خَمْسٌ لاَ يَعْلَمُهَا إِلاَّ اللَّهُ لاَ يَعْلَمُ أَحَدٌ مَا يَكُونُ فِي غَدٍ، وَلاَ يَعْلَمُ أَحَدٌ مَا يَكُونُ فِي الأَرْحَامِ، وَلاَ تَعْلَمُ نَفْسٌ مَاذَا تَكْسِبُ غَدًا، وَمَا تَدْرِي نَفْسٌ بِأَىِّ أَرْضٍ تَمُوتُ، وَمَا يَدْرِي أَحَدٌ مَتَى يَجِيءُ الْمَطَرُ

[Sahih Al-Bukhari, Book of Invoking Allah for Rain (Istisqaa), Hadith: 1039]
Chapter: Except Allah nobody knows when it will rain