Plan for shorter security wait times than peak summer months and watch for airline sales after Labor Day. Use flexible dates to find cheaper midweek fares and consider early-morning departures from Milwaukee Mitchell International Airport (MKE) for better on-time performance. If you're flying to Tucson International Airport (TUS), remember to check connecting hubs—Chicago O'Hare, Dallas/Fort Worth, and Denver are common links. Book parking and rental cars in advance to lock in lower September rates; rideshare pickup and long-term parking at MKE remain convenient options.
Expect daytime temperatures in the 80s–90s°F and occasional late-summer thunderstorms that can cause brief delays. Book rental cars early, as September sees steady demand from visitors taking advantage of cooler desert mornings for hiking. If you're landing for a University of Arizona event or a weekend getaway, reserve hotels near downtown Tucson or the University to stay close to dining and nightlife. Use public transit for short rides, but rent a car for exploring Saguaro National Park, Mount Lemmon, or day trips to Phoenix and Tombstone.