The Meteorological Office has issued an Adverse Weather Alert for the Period Thursday to Friday.
The Met Office says there is a 70% chance of heavy showers or thunderstorms during the period, which may lead to street/flash flooding as well as landslides/landslips in areas so prone.
It adds that gusty winds can also be experienced in the vicinity of heavy downpours.
The Met Office this activity is due to the Inter-Tropical Convergence Zone (ITCZ).
Rainfall accumulations of 35-50 mm can be expected, with higher amounts in isolated areas.