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CSS

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JavaScript

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HTML 

              
                <div class="center shadow-1 j-blue white">
  <div class="dt mw6 center">
    <h2 class="dtc v-mid ph1">Today:</h2>
    <div class="dtc v-mid">
      <img class='mw5 br3 ba bg-white b--black h3 w3' id="main-icon" />
    </div>
    <div class="dtc v-mid pl3">
      <p id="location"></p>
      <p class='f6' id="date"></p>
      <p id="desc"></p>
    </div>
  </div>
</div>

<ul class="pl0 mt0 mw7 center">
</ul>

<a class="f5 no-underline black bg-animate hover-bg-black hover-white inline-flex items-center pa3 ba border-box" data-role='imperial' id="switch-btn">Switch to Metric</a>

<a href="https://www.wunderground.com" target="_blank"><img src="https://icons.wxug.com/logos/JPG/wundergroundLogo_4c_horz.jpg" alt="WeatherUnderground" class="logo" /></a>
!

CSS 

              
                .j-blue {
  background-color: #3A506B;
}

.j-steel-blue {
  background-color: #517096
}

body {
  background-color: #FCFCFC;
}
.logo {
  width:120px;
}
!

JS 

              
                function getLocation() {
  $.getJSON('https://ipapi.co/json/', function(data) {
    var city = data.city;
    var region = data.region;
    getWeather(city, region);
  });
}

function getWeather(city, region) {
  if ($('#switch-btn').data("role") === "imperial") {
    setWeather('f')
  } else {
    $('#switch-btn').text("Switch to Imperial");
    setWeather('c')
  }

  function setWeather(m) {
    $('ul').empty();
    var weatherURL = 'https://api.wunderground.com/api/d6146a43ef046da2/forecast/q/' + region + '/' + city + '.json';
    var desc,
      icon,
      date;
    $.getJSON(weatherURL, function(data) {
      var simpleData = data.forecast.simpleforecast.forecastday[0];
      var textData = data.forecast.txt_forecast.forecastday[0];
      if (m === 'f') {
        desc = textData.fcttext;
      } else {
        desc = textData.fcttext_metric;
      }
      date = simpleData.date.pretty;
      // Setting the Main Text
      $('#main-icon').attr('src', simpleData.icon_url);
      $('#location').text(city + ", " + region);
      $('#date').text(date);
      $('#desc').text(desc);
      // sets the list forecast
      for (x = 1; x < 7; x++) {
        textData = data.forecast.txt_forecast.forecastday[x];
        icon = textData.icon_url;
        // sets to either imperial or metric
        if (m === 'f') {
          desc = textData.fcttext;
        } else {
          desc = textData.fcttext_metric;
        }
        var day = textData.title;
        if (x === 0)
          return;
        $('ul').append("<li class='flex items-center lh-copy pa3 ph0-l bb b--black-10'> <img class='w2 h2 w3-ns h3-ns br-100' src=" + icon + " /> <div class = 'pl3 flex-auto' ><span class='f6 db black-70'>" + desc + "</span> </div> <div><a class='f6 link blue hover-dark-gray'>" + day + "</a> </div> </li>")
      }
    })
  }
}

$(document).ready(function() {
  getLocation();
  $('#switch-btn').click(function() {
    if ($(this).data('role') === 'imperial') {
      $(this).text("Switch to Imperial")
      $(this).data('role', 'metric')
      getLocation();
    } else {
      $(this).text("Switch to Metric")
      $(this).data('role', 'imperial')
      getLocation();
    }
  })
})
!
999px

Console