text: Venus is the hottest planet in our solar system, even though Mercury is the closest planet to the sun. Venus could melt many of the metals that we use in our everyday lifes. Because Venus is the hottest planet, the temperature can reach an average of 800 degrees Fahrenheit. Not only can the surface temperature be high, but there is 97% level of carbon dioxide in Venus' atmophere. Scientist have proven that humans would only withstand three weeks on Venus because of these conditions.