When It Rains
اللَّهُمَّ صَيِّبًا نَافِعًا
Allahumma sayyiban nafi'a
O Allah, let it be a beneficial rain.
Sahih Al-Bukhari
Remembrance
Weather
Rain, thunder, and wind
After Rain
مُطِرْنَا بِفَضْلِ اللَّهِ وَرَحْمَتِهِ
Mutirna bifadlillahi wa rahmatihi
We have been given rain by the grace and mercy of Allah.
Sahih Al-Bukhari 1:147, Sahih Muslim 1:58During Thunder
سُبْحَانَ الَّذِي يُسَبِّحُ الرَّعْدُ بِحَمْدِهِ وَالْمَلَائِكَةُ مِنْ خِيفَتِهِ
Subhanal-ladhi yusabbihur-ra'du bihamdihi wal-mala'ikatu min khifatihi
Glory be to Him whom the thunder glorifies with His praise, and the angels out of fear of Him.
Al-Muwatta' 2:992Each dua is shown with its reference where the source records one, so you can check it. Duas whose wording you intend to rely on in worship are worth confirming with a qualified teacher.