Mist
The 4 letter word for a light rain can be mist.
mist
One word that fits this definition is mist.
precipitation
Light rain is a type of rain that falls gently and typically does not result in heavy precipitation. Changing one letter from "pass" could result in the word "sass."
The answer to "a light rain" when changing one letter from "pass" is "sprinkle." By changing the 'p' in "pass" to an 'r', you create the word "rain," which is a type of precipitation. Therefore, the phrase "a light rain" can be formed by changing one letter from "pass."
star
No, it is not.
weather
Light Shower or sprinkling.
hail
Long