The met service on Thursday issued a yellow weather alert warning of isolated heavy thunderstorms.
The service urged the public to be careful as isolated heavy thunderstorms are expected to affect inland, mountainous as well as coastal areas over the eastern half of the island. Shower rates may reach 50 millimetres per hour, while hail is also likely, it said.
The warning will be in force from 12 noon until 6pm on Thursday.
“Be aware that thunderstorms may occur. Take extra care in exposed areas, like mountains, forest and open terrain. Disruption to outdoor activities is possible,” the met office said.
Meanwhile, in its forecast for Thursday, the met office said temperatures will rise to 32C inland, around 31C on the west coasts, around 29C on the remaining coasts and around 21C in the higher mountains.
Friday will be mainly fine with increased cloud in the southern part of the island which may lead to isolated showers.