What is the weather on Route 66 like at September October time?

In September and October, the weather along Route 66 varies significantly depending on the region. Generally, you can expect mild to warm temperatures, with daytime highs ranging from the upper 70s to low 90s Fahrenheit (around 25-35°C) in many areas. Nights can be cooler, particularly in the more arid regions and at higher elevations, where temperatures may drop into the 40s and 50s Fahrenheit (about 5-15°C). Overall, this time of year offers comfortable conditions for road trips, with less humidity and fewer tourists than in the summer months.