A yellow weather warning has been issued for Northern Ireland on Wednesday with heavy rain expected.
The Met Office has issued the warning for Co Armagh and Co Down between midday and midnight.
It warned the rain could lead to travel disruption and flooding.
A Met Office spokesperson said people should be prepared for spray and flooding on roads "probably making journey times longer".
Bus and train services could also be affected leading to further knock on delays.
"Flooding of a few homes and businesses is possible," the spokesperson said.
"Spells of heavy rain will affect southwest Scotland and parts of Northern Ireland on Wednesday, especially during the afternoon and evening.
"20-30mm is likely quite widely with as much as 40-50mm in a few places, mainly hilly parts of Dumfries and Galloway and South Down.
"The rain will clear away southeastwards later on Wednesday evening."
Thursday is set to be a drier and brighter day with sunny spells and scattered showers. Showers will be mainly in the west and towards the north coast, with freshening southwesterly winds. Maximum temperature will be 19 °C.
Friday is set to be quite windy with blustery showers. Rain is possible for a time later on Saturday, otherwise Northern Ireland is set for a lot of dry weather over the weekend with some sunshine and lighter winds.