Best Places to Visit in the USA in September 2026

the USA in September ranges from about 10°C (Denali National Park) to 33°C (Las Vegas). Median around 21°C. The exact temperature depends heavily on which destination — coastal vs inland, north vs south, altitude all matter.

Denali National Park, United States averages around 10°C in September — the coolest destination in the USA on our list. Worth checking peak/shoulder season too: even with cool temps, September may not be peak for the destination.

Las Vegas, United States runs around 33°C in September — the warmest destination in the USA on our list. If you're chasing summer in winter or beach weather year-round, this is the move.

Across the USA we have 89 destinations with weather data. Whether September is "good" depends on what you're after: cool weather, warm weather, peak season pricing or shoulder. The list below sorts by temperature so you can match destinations to your weather preference.