JSFiddle - React, Tailwind, and code Playground
HTML
<table id="tbl_forecast">
<tr>
<td>a</td>
<td>b</td>
</tr>
<tr>
<td>8h</td>
<td>5g</td>
</tr>
<tr>
<td>9j</td>
<td>8h</td>
</tr>
</table>
CSS
.higlight{
background-color:red;
}
JavaScript
var temp =" 8h";
$('#tbl_forecast tr').find("td:contains('"+temp.trim()+"')").addClass('higlight');