Hi I'm looking at going to HK for around 4-5 days end of June this year (22-26 ish).

I'm afraid so. There will have frequent rainy days in the end of June. The weather condition will influence the sightseeing a lot. However, it won't be cold. The climate may be warm and comfortable. You are advised to prepare long-sleeved shirts, T-shirts, jeans, pants and sneakers. Remember to bring the rain gear.