When worms creep out of the ground in great numbers, expect wet weather.
Snails.
Snails moving on bushes or grass, are signs of rain.
When black snails cross your path,
Black clouds much moisture hath.
Leech.
A leech placed in a jar of water will remain at the bottom until rain is approaching, when it will rise to the surface, and if thunder is to follow will frequently crawl out of the water.
Leeches kept in glass jars move about more frequently just before rain.
Lizards.
When lizards chirrup, it is a sure indication of rain.