Tomorrow 1 1, I'm going to Hong Kong, but the weather forecast says there will be heavy rain, and the air tickets are all booked. Will it affect travel?

The impact should not be too great. The rain here is mostly showers, which come and go quickly, and basically will not affect the trip. When it rains heavily, take shelter from the rain or go shopping in the mall. When it rains, it is usually near noon, which will not affect the travel itinerary too much and will not rain for too long.