There are several places where you can get weather information in iOS, including Apple Maps. It displays the temperature of your location, but you can also get more details with a 3D Touch Apple Maps action.
If you 3D Touch the temperature indicator in Apple Maps, you can see a 7-8 hour forecast for that particular location. It’s a handy feature if you’re in Maps and you quickly want to see the weather. You can do this instead of opening the Weather app and searching for a location there.