The temperature required for the oceans to boil would depend on several factors, such as the atmospheric pressure and the salt content of the water. However, under normal atmospheric pressure and average salt content, the boiling point of seawater is slightly higher than that of pure water.
At sea level, pure water boils at 100 degrees Celsius (212 degrees Fahrenheit). Seawater, which contains salt and other dissolved substances, has a higher boiling point due to the colligative properties of the solutes. The average boiling point of seawater is around 100.7 degrees Celsius (213.3 degrees Fahrenheit).
To boil the oceans, the temperature would need to rise significantly above these values. However, it's important to note that such extreme temperatures are not naturally achievable on Earth's surface without some catastrophic event or artificial means.