<div id="data">
</div>
<input type="text" value="Which city are you in?">
<input type="button" value ="Submit" onclick="findWeather()">

function findWeather() {
    $.get("http://api.openweathermap.org/data/2.5/forecast?q=Eindhoven&appid=*My_APP_ID*",
            function () {
                document.getElementById("data").innerHTML = data.list.main.temp;
            })
}

function findWeather(){
    $.get("http://api.openweathermap.org/data/2.5/forecast?q=Eindhoven&appid=*My_APP_ID*",
           function(data) {
               document.getElementById("data").innerHTML = data.list.main.temp;
    })
}