It will be a cloudy start across Ulster with isolated showers, but warm spells of sunshine will break through during the afternoon and evening.
Highest temperatures of 18 to 23 degrees, warmest in the east, in light westerly winds.
Tonight will be largely dry with a mix of cloud and clear spells, though some mist and fog patches will develop. Lowest temperatures of 10 to 13 degrees, in light variable or westerly winds.
Tomorrow morning, any lingering mist and fog will burn off quickly. It will be cloudy at times in the morning with the chance of light showers but better spells of sunshine will develop for the afternoon and evening. Highest temperatures of 18 to 24 or 25 degrees, warmest in the east, degrees in light southerly or variable winds.
Temperatures are expected to rise to as high as 28 degrees from Friday and through the weekend.
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