It appears that Google has changed the way the card in Google Now displays the weather. The previous arrangement of showing a stack of cards, most often with your home and work locations, has now changed to display one card, with your locations on the one card.
You can access the old style weather card for each location, complete with the days forecast and a brief four day forecast by selecting the location. You can also as usual expand that out to a Google Search card by tapping the forecast.
The change seems to be rolling out pretty quickly, with the updated card now showing on all of my devices as well as on the wife’s Galaxy S4. Check your device now and see if you can see it.