Mizzle is a noun that refers to a light rain. 

The Middle English word ‘misun’ (MEE sun) was used to describe a light mist of rain. Centuries later, our word of the day can be used in a similar way. Here’s an example of mizzle in use:

A downpour of rain can make things difficult for my morning jog, but a mizzle can feel great. Not only does it not interfere with my running, but that light mist of water feels cool against my skin.