score:1

Accepted answer

The problem is that you don't set icons URL for point markers anywhere. So the solution is to pass points array like that (spline series):

[{
  x: x,
  y: y,
  marker: {
    symbol: url
  }
}, ...]

In your example:

{
  name: 'Temperatura',
  type: 'spline',
  data: datos3.map((item, index) => {
    return {
      x: item[0],
      y: item[1],
      marker: {
        symbol: datos[index],
        width: 20,
        height: 20
      }
    }
  }),
  tooltip: {
    valueSuffix: ' °C',
    valueDecimals: 2,
  },
  marker: {
    enabled: true
  },
  color: Highcharts.getOptions().colors[2],
}

Demo:


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