Do your students need to know more than just "sunny" and "rainy"? This PPT outlines intermediate level vocabulary like "drizzle," along with explanations and examples. Check out http://www.davidteaching.blogspot.com for more ESL materials.
13. Adjectives
It is + adjective It’s a(n) + adjective + day
It’s very humid today.
It’s windy.
It’s rainy today.
It’s hot.
This can be adjusted according
to time:
It was snowy yesterday.
It’ll be cold tomorrow.
It’s a rainy day.
It’s a sunny day.
It’s a foggy day.
It’s a windy day.
14. Verbs and Nouns
It’s verb-ing There’s + noun
It’s snowing.
It’s raining.
It’s drizzling.
It’s hailing.
There’s going to be snow
tomorrow.
There was rain yesterday.
There was a lot of lightning
last night.
15. Verbs, Nouns, Adjectives
Some kinds of weather have all three word forms:
It’s raining! (verb)
It’s rainy! (adjective)
There’s been a lot of rain recently. (noun)
However, others don’t:
It’s sunning!
It’s sunny!
There’s been a lot of sunshine recently.