Having students observe the weather at their school for a few days or even a week prior to and after you lesson would be awesome with the students recording what they observe, temperatures, wind, coudiness, precipitation--that sort of thing; then your lesson will be even more meaningful.
Connecting the need to know the weather-how to read the sky- to what activities students can do outside, what clothes they should wear, etc. is another way to engage. With that said, temperature and precipitation are the mean measurements collected for climate scientists and for trends of weather (climate), so you might focus on those two concepts.
Here are several vetted resources that you may find useful:
K-ESS2-1 weather lessons from Better lessons;
Science Kindergarten Weather includes instructions making a model thermometer and a rain guage
Gift of Curiousity weather unit
Windows to the Universe is an incredible website full of resources for all grade levels!
NASA has more climate lessons but you might find something useful here.
I teach a weather monitoring unit at the high school level; perhaps it will give you some ideas for observing weather. I have attached my list of weather websites also.
Hope this helps you!