haakon wrote:Hi, does the 10 minute update intervals mean that a Netatmo station with rain gauge is unable to trigger a rain alarm instantly? ...
Unfortunately, I think you will need a local rain gauge of some type. The Netatmo service requires the information pass through their cloud and they only poll the local stations every 10 minutes.
You might try a rain detector like is used for an irrigation system.
Here is an example from Amazon. But, even these will take some time to register the rainfall. Typically, they have a sponge inside and as the sponge gets wetter, it allows a current to flow. A real rain gauge, usually based on a tipping bucket, will cost more.