Oman and the UAE each has a few cases. Temperatures is ~75F. MERS outbreak started in the middle east in the dead of the summer in 2012.
According to Harvard SITN:
The results from the study suggest that influenza actually survives longer at low humidity and low temperatures. At 43°F with very low humidity, most of the virus was able to survive more than 23 hours, whereas at high humidity and a temperature of 90°F, survival was diminished at even one hour into incubation
