Unusually high temperatures for late September are expected across the Netherlands this week, with highs of 25-28 degrees Celcius in many areas. According to Weeronline, several heat records could therefore fall. Showers moving in from the west Wednesday evening will push the warmth out and may produce thunderstorms. After that, highs are to settle near 20 degrees, with Thursday set to be the cloudiest and the wettest day.