Source: The Great Interpretation of Dreams (Ibn Sirin)
Heat in a dream, in its season (summer), indicates fertility, sustenance, and benefit. Out of its season, it indicates illnesses, worries, and strife.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
Heat indicates poverty and debt. Whoever sees himself being harmed by heat will be afflicted with worry and grief from a ruler or a debt.
Source: Signs in the Science of Expressions (Ibn Shaheen)
Heat is interpreted as worry and grief. Whoever sees himself in heat will be afflicted with worry.