How Hot is a Car After One Hour in the Sun or Shade? (image) Arizona State University Share Print E-Mail Caption Cars can become deadly after one hour in the sun on a hot summer day. Credit Graphic by Safwat Saleem/ASU Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.