If you're within a few days of your trip, check out the National Weather Service forecast for Sandusky. Otherwise, it's kind of like guessing how crowded the park will be on any given date: you never know for sure, but sometimes you can get an idea.
Average high temperatures in Sandusky range from the mid 60's in early May to the low 80's in July and down into the mid 50's in October. July and August are fairly dry months. HalloWeekends weather in October can be anything from warm and sunny to just plain cold (with a little ice thrown in for good measure!).
Take a quick look at weather history and you'll see varied weather on the major holidays: Memorial Day, Independence Day, and Labor Day. Just goes to show you never know what you're going to get. Don't worry, there are plenty nice days to be had.
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