This flight path from Chiang Rai to Hong Kong Intl was viewed by 91 users in the past month. Keep an eye out for changes in search interest prior to high and low season.
When travelling, it's generally smart to pack in preparation for rain or any other conditions that may arise. The rainfall in Chiang Rai is roughly similar to Hong Kong International. You can assume this to be the case over the next 5 days.
Expect the weather to be around 35 °C on average in April. As the temperature peaks, try to get your plans done early, as flight price and availability will have an impact on your travels. The climate in Hong Kong International is generally colder than in Chiang Rai.