I just checked about webhooks and it seems to be very interesting and what I need. What I just did not get is how to filter the JSON answer to just get the temparature.
{"latitude":46.7424,"longitude":7.0964,"timezone":"Europe/Zurich","offset":1,"currently":{"time":1489077037,"summary":"Light
Rain","icon":"rain","precipIntensity":0.5867,"precipProbability":0.63,"precipType":"rain","temperature":8.14,"apparentTemperature":7.37,"dewPoint":4.29,"humidity":0.77,"windSpeed":1.65,"windBearing":261,"visibility":9.99,"cloudCover":1,"pressure":1023.94,"ozone":307.14},"hourly":{"summary":"Light
rain throughout the
day.","icon":"rain","data":[{"time":1489075200,"summary":"Light
Rain","icon":"rain","precipIntensity":0.5309,"precipProbability":0.61,"precipType":"rain","temperature":10.38,"apparentTemperature":10.38,"dewPoint":6.37,"humidity":0.76,"windSpeed":1.73,"windBearing":264,"visibility":9.99,"cloudCover":1,"pressure":1023.82,"ozone":307.71},{"time":1489078800,"summary":"Light
Rain","icon":"rain","precipIntensity":0.6401,"precipProbability":0.64,"precipType":"rain","temperature":5.99,"apparentTemperature":5,"dewPoint":2.28,"humidity":0.77,"windSpeed":1.56,"windBearing":258,"visibility":9.99,"cloudCover":1,"pressure":1024.05,"ozone":306.59},{"time":1489082400,"summary":"Light
Rain","icon":"rain","precipIntensity":0.7493,"precipProbability":0.66,"precipType":"rain","temperature":5.19,"apparentTemperature":4.24,"dewPoint":1.79,"humidity":0.79,"windSpeed":1.44,"windBearing":254,"visibility":9.99,"cloudCover":1,"pressure":1024.34,"ozone":306.17},{"time":1489086000,"summary":"Light
Rain","icon":"rain","precipIntensity":0.8814,"precipProbability":0.68,"precipType":"rain","temperature":4.88,"apparentTemperature":4.01,"dewPoint":1.99,"humidity":0.82,"windSpeed":1.36,"windBearing":253,"visibility":9.99,"cloudCover":1,"pressure":1024.74,"ozone":306.91},{"time":1489089600,"summary":"Light
Rain" ........