We went last June and the forecast called for thunderstorms most days. In reality, it didn't rain everyday and when it did, it usually started around 3pm and rained for an hour or so. Only one evening did it rain and rain and rain. So, I don't think it will be that rainy. It wasn't a problem. I bought cheap ponchos and we'd just carry on. Many of the attractions are inside anyways.
We're leaving tomorrow to drive down (hooray!). We have a few stops, so we don't get to the park til Monday night, but I'm hoping for SOME rainy forecasts to help reduce the crowds.
I'd prefer to see the sun most of the time, but if it rains all day everyday I can live with it. At least it won't be FREEZING RAIN which is what we have here at home AGAIN today!!!
See you down there! Have a great time!