I'm planning Hong Kong visit on Oct 8-9, which has a thunderstorm prediction.

Well, according to the weather forecast, the temperature will be 75 F to 85 F. It maybe have several showers in these two days. But generally speaking, it won't influence the sightseeing a lot. Thus you can still tour around Disneyland and Ocean Park. In addition, because of the rain, it's not suggested to climb the mountain and take the cable car.