https://github.com/NTag/react-fontawesome

color-font-awesome.js

import { library } from '@fortawesome/fontawesome-svg-core';
import { faCloudSun } from '@fortawesome/free-solid-svg-icons';
import FontAwesomeIcon from '@ntag/react-fontawesome';

library.add(faCloudSun);

export const Weather = () => (
  <div>
    <h1>Weather</h1>
    <FontAwesomeIcon icon="cloud-sun" fill={['#3C6997', '#EDFF71', '#F1DB4B']} />
  </div>
);