Purity: Moisture Drying Due to Heat
Practical Laws of Islam as per the teachings of Ayatullah Sistani
Ruling 283:
If a person performs the acts of wuḍūʾ in close succession but the moisture on the previous places has dried up by means of hot weather or on account of excess body heat and suchlike, his wuḍūʾ is valid.
-Ayatullah Sistani, Practical Laws of Islam, Purification (Taharah)