Can I open the window?
fi-nes-TRI-no — stress on third syllable. A-pri-re — stress on first syllable.
On regional trains in warm weather when the carriage is hot and ventilation is needed.
'Aprire' (to open) is one of the four fundamental verbs alongside 'chiudere' (to close), 'accendere' (to turn on), and 'spegnere' (to turn off). On modern high-speed trains windows cannot be opened. On older regional trains they can — but it is polite to ask other passengers first.
Ha caldo anche lei?
Are you also hot?
Check that others share your need before opening the window
Posso chiudere il finestrino? C'è corrente.
Can I close the window? There's a draught.
The opposite request
Fa troppo caldo qui. C'è l'aria condizionata?
It's too hot here. Is there air conditioning?
Better long-term solution than opening a window
Italy's regional train fleet includes both modern air-conditioned units and older carriages without climate control. Summer journeys on older regional trains can be very hot. High-speed trains (Frecciarossa, Italo) are fully climate-controlled. Italians use the expression 'corrente d'aria' (draught) as a general danger to health — opening windows can cause complaints.