Hongkong weather in March

Just as you know, the rain season starts from around the March to September, so it may rain a lot, but it will not rain all the day. The rain gear is necessary.
During the rainy days, it will be cold and humid, so a thick coat is necessary. If there is no rain, it iwll be foggy days.
It is suggested to look at the local weather forecast in advance to adjust your plan.