Source: The Great Interpretation of Dreams (Ibn Sirin)
Hail in a dream is torment from God or war. If it is a small amount in its season, it is fertility and sustenance.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
Hail indicates high prices and poverty. It may indicate illness.
Source: Signs in the Science of Expressions (Ibn Shaheen)
Hail is interpreted as torment. Whoever sees it descending on a people, torment will befall them.