Hi there. The weather is supposed to be in the mid 70's next week and goes down to the mid 50's at night, more like sweatshirt weather. The two parks at Disneyland are huge, and I recommend a stroller for sure if the children are under 4. If you are staying at the park or close, you can really take your time and break up the days with the little ones. If you are going midweek, it is a great time to go. The parks shouldn't be crowded. If they are for some strange reason, there is "Fastpass" for rides so you don't have to wait in line. You can also download an app which will give you wait times for rides.
I'm from here and grew up going to Disneyland. I love every inch of it. So see it all!! If you have any questions, feel free to contact me. Have fun!