JSFiddle - React, Tailwind, and code Playground

HTML

<select id="cd-dropdown" class="cd-select">
    <option value="-1" selected>Choose a weather condition</option>
    <option value="1">Sun</option>
    <option value="2">Clouds</option>
    <option value="3">Snow</option>
    <option value="4">Rain</option>
    <option value="5">Windy</option>
</select>

JavaScript

$( "#cd-dropdown option" ).addClass(function(index) {
return "icon-" + $(this).text().toLowerCase();
});