Monday and Tuesday will be sunny and warm for the time of year, with the temperature reaching the mid 20s Celsius over most of the country, although it will be a little cooler on the coast, weather bureau KNMI says.

By Wednesday, however, there will be more cloud with light showers, and on Thursday and Friday it will be wet, with the temperature dropping to no more than 16 Celsius by the end of the week.

Monday and Tuesday evening will be chilly, and the first ground frost of the season -1.3 Celsius – was recorded at Twente weather station on Saturday night.

Ground frosts in September are not usual. According to Weeronline, the first ground frost is usually recorded around September 12, and the earliest on record was on August 23 1973, when the temperature dropped a fraction below zero at the Eindhoven weather station.

The KNMI’s long term forecast says there is a 70% chance of cooler, wet weather heading into October.