H.W.
Some of our day is spent indoors. A washtub full of water with funnels and marbles and bubbles is a big time-spender for my son , who is four. (Your little one can use a pie pan of water on a towel... if he can sit up, sit with him and let him splash in it.) We love block play, reading books, soaked watercolor paper with watercolor pencils or watercolor crayons.Fun to watch the pure color run. Playdough. Playing with cars and ramps is fun for him.
It's also fun to draw a picture with markers or have the kids do some watercolor onto paper, then put the paper outside to be rained on, to see the effect.
And we are sure to go outside too. We have rain gear. Sometimes, on the slower side streets, we take puddle-stomp walks right in the street... I just stand guard and we get up on the sidewalk quickly if I see a car coming. We only started doing this when he was 3.5 years.(Little ones don't understand so well about not playing in the street.) Even at my preschool, we go out in the uncovered backyard, rain or shine. Sandbox play and mud pies and watching the rain on the different plants in the garden, or pouring out of the gutter onto the rocks of the rain garden. When my son was little, I'd wear him in the pack and take an umbrella. We had a good time if the weather wasn't wild.:)