The Netherlands has four seasons: winter (January – March), spring (April – June), summer (July – September) and autumn (October – December). The weather in Utrecht in summer can be pleasant, sunny and warm, i.e. 20-28 degrees Celsius. However, nothing is less predictable than the Dutch weather and the end of september is almost autumn, so it is very likely that we will have colder, cloudy and rainy days during the conference as well. Therefore you are well advised to not only bring summer clothes, but also something a little warmer and for example a raincoat.