At this time, Cheapflights has noticed price decreases for many domestic flights due to COVID-19. Travel is not necessarily recommended at this time, and flights may be prone to cancellation: please check with local authorities in both Heathrow and Negril for travel alerts, and be sure to review the airline's cancellation policy and travel advisories before booking. For more information, please view our post on what to know about COVID-19 (coronavirus) and travel.
When travelling, it's generally smart to pack in preparation for rain or any other conditions that may arise. The rainfall in Heathrow is roughly less than Negril. You can assume this to be the case over the next 18 days.
With an average temperature of 33 °C, peak weather can be found in June. As a traveller, expect to see changes in flight prices during that period. The temperatures in Negril are hotter than in Heathrow.