The sermon centers on praise of Allah, repentance, asking forgiveness, and praying for rainfall. Istighfar is prominent because the purpose is relief from drought.
The Quranic expression اسْتَغْفِرُوا رَبَّكُمْ
Translation: Seek forgiveness from your Lord.
shows this link between repentance and the request for rain.
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Salat al-Istisqa: Supplication for Rain and Juristic Rulings
The sermon centers on praise of Allah, repentance, asking forgiveness, and praying for rainfall. Istighfar is prominent because the purpose is relief from drought.
The Quranic expression اسْتَغْفِرُوا رَبَّكُمْ
Translation: Seek forgiveness from your Lord.
shows this link between repentance and the request for rain.