When travelling, it's generally smart to pack in preparation for rain or any other conditions that may arise. The rainfall in Bangkok Intl is roughly similar to Ajaccio. You can assume this to be the case over the next 3 days.
With an average temperature of 36 °C, peak weather can be found in April. As a traveller, expect to see changes in flight prices during that period. The temperatures in Ajaccio are colder than in Bangkok Intl.