Nexus 5 "Ok Google" voice output in a non-English US language

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http://android.stackexchange.com – I'm trying the have vocal output from my nexus 5 with a non english system language. If my system language is English(US) I say "ok google" and it opens google now, I say "what's the weather like today" and it show me a weather-widget with the weather and the phone speaks. Otherwise, if my system language is Italian, and I set English(US) in the voice settings, if I say "ok google" it opens google now, but if I say "what's the weather like today" nexus simply search it in web: no widget, no voice! My question is: it is possible to have the (english) output voice feedback from my questions i (HowTos)