But there'll also be some thundershowers in parts.

There'll be highs of 20 degrees in some parts of Ireland towards the weekend.
Met Éireann predicts a week of sunny spells and scattered showers, some of them thundery in parts of the country. Here's how the weather is shaping up over the next few days:
Today
By this evening, cloud and showery rain will gradually move northeastwards into parts of Leinster and the midlands. Those showers will spread to all parts of Ireland by tonight. Some of them will be heavy or thundery especially in the south and west with lows of 7 degrees.
Thursday
Tomorrow will be a mostly cloudy start with showers developing through the day. Again, some will be heavy, but the heaviest showers will be mainly in the north midlands and Ulster with sunny spells developing also. There'll be highs of 17 degrees, but it will be a little cooler near the south coast.
Friday
Friday morning will start out largely dry and mostly cloudy. However, scattered showers will develop across the north and west. There'll also be some sunny spells across the country, especially in the east with all areas becoming brighter throughout the day and highs of 19 degrees. Friday night will be mainly dry with clear spells and just the odd scattered shower. Expect lows of 7 degrees with some mist and fog forming in many areas.
Saturday
Expect another day of sunny spells and scattered showers on Saturday. Those showers will be most likely over the northern half of the country in the morning but all areas will be mostly dry later in the day. Another mild day is in store with highs of 20 degrees, but it will feel cooler through Ulster and northern coastal counties. The forecast for Saturday night is dry with clear spells. It'll be coldest in Ulster with lows of 1 degree but expect lows of 4 degrees elsewhere.
Sunday
Sunday will be a lot cooler than Saturday. However, it'll be dry with a mix of cloud and sunny spells. Temperatures will be between 10 and 13 degrees, warmer in the south. Sunday night is predicted to be dry with temperatures dropping down to 0.