You can easily add or remove a layer using GMaps.js:
var map = new GMaps({
el: '#map',
lat: -12.043333,
lng: -77.028333
});
map.addLayer('weather', {
clickable: false
});
map.addLayer('clouds');
Note: You can choose different layers. Possible values are weather, clouds, traffic, transit and/or bicycling
Note: Be aware that you have to add the library 'weather' in the url for the weather/clouds layer:
http://maps.google.com/maps/api/js?sensor=true&libraries=weather
Note: In the second param you can add your options for the layer as object.
Note: To remove a layer you can use
map.removeLayer('clouds');