Flights: There are flights to Frankfurt or Munich from different cities in the U.S. via different airlines with a train connection to Augsburg. There also train from several major cities in Europe to Augsburg.
German Train site: https://www.bahn.com/en/view/booking-information/booking/online-ticket.shtml
• Munich Airport to Augsburg—-1hr23min—Appx: €23/one way
• Frankfurt Airport to Augsburg—3hr—Appx: €28/one way
Climate: The weather at the end of June varies from 72-52 F
Visa Requirements: At this point in time, the U.S. passport holders do not need a visa for a short stay (3 months) in the European Union. For other countries, please visit the site: https://travel.state.gov/content/travel/en/international-travel/International-Travel-Country-Information-Pages/Germany.html