Native to BlackBerry 10 we have a vast selection of weather applications and in fact all new devices come pre-loaded with BlackBerry Weather that is powered by AccuWeather. But if you fancy a change and you're in the UK you may want to hit up the Met Office app. You won't find it in BlackBerry World though as it's an Android app, but if you're running BlackBerry OS 10.2.1 you can just install the APK from the likes of Snap.
Once you launch the app for the first time it should detect your location via GPS. You can however also add other locations around the UK and you can swipe to the left to seamlessly switch between them.
From the home screen you are given the summary for the day which also includes UV, wind speed, sunrise and sunset - all with a rather attractive UI. Tapping the small arrow next to your town will open up a five day forecast and again, you can dive deeper into each day for more information - including the chances of rain, the humidity and more.
If you fancy having a look at the whole of the UK you can do so by pressing the UK map icon at the top of the page. You'll be able to zoom in and out and have a choice of what's shown on the map - whether that be the temperature/clouds etc. At the base of the map you can also jump forward in time by an hour to really know what's coming your way weather wise.
I've tested the app out on my Z30 and Q10 and both run perfectly which is great to see. It's certainly a nice alternative to the native apps we have and to be honest, it works so well we don't really need the Met Office to make a specific BlackBerry 10 version.