Making Travel Plans for September? Here is our ranking of the Best countries to visit in September. a significant month for travel lust. Why? since most places in the globe are perfect to visit during this month. The seasons shift because the Autumn Equinox (in the Northern Hemisphere) occurs this month. September is the perfect time to travel because of the beautiful weather, the abundance of tourism options, and the festive mood, even among the locals, as summer gives way to fall in the Northern Hemisphere and winter to spring in the Southern Hemisphere.