$(document).ready(function () {
$('#temp').text(temp)
});
....
<p>현재기온 : <span id="temp">00.0</span>도 </p>
$.ajax({
type: "GET",
url: "http://spartacodingclub.shop/sparta_api/weather/yongin",
data: {},
success: function (response) {
let temp = response['temp']
}
})