Biggest differences between the two:
- Monsoon season in AZ creates much higher humidity during summer months.
- Vegas still cools down at night. Phoenix often stays above 100 degrees until long after dark and never cools down. Nights in Phoenix are sweltering.
- Phoenix has a longer “summer” and more mild winters.


Phoenix average temp high/low:
June 104/76
July 106/82
August 105/81
Sept 100/75


Vegas average temp high/low:
June 102/61
July 107/67
August 104/66
Sept 96/57