How hot can a lightning strike get? The lightning strike can get up to 30,000 Celsius which is 6 times  hotter than the surface of the sun. How hot is lightning Fahrenheit vs the Sun's surface? Lightning is actually hotter, it can reach temperatures of roughly 30,000 kelvins (53,540 degrees Fahrenheit). The sun, on the other hand, is eclipsed in this case -- its surf…ace temperature is just 6,000 kelvins (10,340 degrees Fahrenheit). 2 people found this useful.