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The COVID-19 pandemic disease affects us all and get the world into an enormous crisis. Temperature is an important factor in infectivity reduction of viral disease. The current study screens the probable association between the extreme temperature events and COVID-19 outbreak. The most recent heatwave that hit Egypt in May 2020 selected as a case study. We studied the daily progression and current situation of COVID-19 morbidity in Egypt. The concurrent heatwave was identified and synoptically explained in deep. Considering the incubation-induced lag time between heatwave intensities and COVID-19 confirmed cases, visual interpretation of line graphs discovered an interesting identical connection between the real-time thermal intensities and the 14-day retreated infected cases during the heatwave days. The 5-day heatwave with thermal intensities 6.1–7.8 °C led to a 5-day fall in COVID-19 morbidity. The thermal intensity peak of the heatwave caused the greatest decline in COVID-19 confirmed cases by about onethird. The 2nd order polynomial regression model for the relationship suggested that heatwave intensity of 5.5 °C is the critical thermal threshold at which COVID-19 morbidity begins to be reduced, and 10.7 °C as a threshold of COVID-19 outbreak pause. It is concluded that heatwave of late spring can effectively restrict COVID-19 pandemic outbreak in warm arid environments like Egypt. COVID-19 is also highly expected to be restricted as the temperatures increase with the advance of summer season. It is recommended that lag time resulted from the virus incubation period must be considered in COVID-19 mortality and morbidity researches.

Extreme Temperature Events Can Mitigate COVID-19 Morbidity in Warm Arid Environments: A Conclusion from Late Spring 2020 Heatwave in Egypt