Rain in a dream often signals emotional release -- tears you haven't let yourself cry, or tension finally finding an outlet. A gentle rain can feel cleansing, washing away something you've been carrying, while a relentless downpour may point to sadness that's asking for more attention than you've given it.
'Tis ill to begin any lawsuits or other controversies when the Moon is ill dignified: the plaintiff without doubt will be overcome. - William Lilly (1602.-1681.)