The New Delhi Indira Gandhi Intl to Shannon flight path was viewed by 11 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 Delhi is roughly less than Shannon. You can assume this to be the case over the next 4 days.
Expect the weather to be around 40 °C on average in May. 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 Shannon is generally colder than in Delhi.