This is a very basic JSON API for very basic weather data from the Royal Netherlands Meteorological Institute.
The KNMI offers no simple API for simple data, so I built this one, which scrapes their website. Currently, it only offers a single API call, for the latest weather observations at 36 monitoring stations.
Call http://weer.solidlinks.nl/actueel/ or run your own instance. Be gentle if you want to use mine :)
The data format should mostly speak for itself. Units are: