GOING TO HONG KONG JUNE 10. WILL DISNELYLAND BE OKAY TO VISIT OR TOO HOT ?

Well, it would be hot then, with the temp range of 80-90F. Also it is very likely to rain on that day, which probably ruin the trip at Disneyland. If you don't mind, I'd suggest you change your plan earlier to end of May, when the temp would be more comfortable and cloudy days would happen in most cases.