skyvector (
www.skyvector.com) gives you METARs and TAFs (where available) for all airports worldwide.
On my phone I use MyE6B, costs something like $5 and gives you also METARs and TAFs worldwide.
If you want more thorough analysis, that will depend on where you are. In the US for example you can read the individual forecasters' analysis that has led to the actual forecast, but I don't think that's available in other countries.