How Hot is Lightning?

Lightning is a fascinating natural phenomenon that can be both beautiful and deadly. One of the most intriguing aspects of lightning is its extreme heat, which exceeds the temperature of the sun’s surface. In this article, we will explore the reasons behind lightning’s high temperature, and compare it to other natural and man-made phenomena like the sun, lava, and nuclear reactions to put its intense heat into perspective.

Why does Lightning get so Hot?

Lightning gets so hot due to the rapid movement of electrons during an electrostatic discharge. When a thunderstorm develops, there is a separation of electrical charges within the storm clouds. The upper part of the cloud typically becomes positively charged, while the lower part becomes negatively charged. This charge separation creates an electric field between the two regions, as well as between the negatively charged cloud base and the positively charged ground.

When the electric field becomes strong enough, it can overcome the insulating properties of the air, causing a sudden discharge of electricity known as lightning. During this discharge, electrons rapidly move from the negatively charged region to the positively charged region, either within the cloud (intra-cloud lightning) or between the cloud and the ground (cloud-to-ground lightning).

As these electrons travel through the air, they collide with air molecules, transferring their energy to them. This transfer of energy causes the molecules to become highly energized, leading to the emission of light and the production of heat. The rapid movement of electrons and the subsequent collisions with air molecules generate immense heat in a very short amount of time, causing the temperature of the lightning channel to rise up to extremely hot temperatures.

This extreme heat causes the surrounding air to rapidly expand, creating a shock wave that we perceive as thunder.

Is Lightning Hotter than the Sun?

Yes, lightning is hotter than the surface of the sun. The temperature of a lightning bolt can reach up to 30,000 Kelvin (53,540 degrees Fahrenheit), while the sun’s surface temperature is around 5,500 Kelvin (9,932 degrees Fahrenheit). However, it’s important to note that the sun’s core temperature is much higher, at approximately 15 million Kelvin (27 million degrees Fahrenheit). While lightning is incredibly hot, it exists only for a very short duration, whereas the sun maintains its high temperatures continuously.

Is Lightning as Bright as the Sun?

While lightning can appear extremely bright, especially when observed at night or in dark conditions, it is not as bright as the sun. The sun’s brightness is much more intense due to its size, distance, and the amount of energy it emits. The sun is the primary source of light and energy for the Earth and is approximately 400,000 times brighter than the full moon.

Lightning, on the other hand, is a sudden electrostatic discharge that occurs during a thunderstorm, creating a bright flash as the electric current travels through the air. This flash can be very bright, but it is brief and localized, so it doesn’t come close to the sun’s overall brightness. Additionally, the brightness of lightning can vary depending on factors such as the size of the lightning bolt, atmospheric conditions, and the distance from the observer.

Is Lava Hotter than Lighting?

No, lava is not hotter than lightning. Lava, the molten rock that flows from volcanic eruptions, has temperatures ranging from about 700 to 1,200 degrees Celsius (1,300 to 2,200 degrees Fahrenheit), depending on its composition and location. As mentioned before, lightning can reach temperatures of up to 30,000 Kelvin (53,540 degrees Fahrenheit), which is significantly hotter than lava.

What is Hotter than Lighting?

There are several phenomena that are hotter than lightning, along with some man-made inventions. Some examples include:

The sun’s core:

The core of the sun reaches temperatures of approximately 15 million Kelvin (27 million degrees Fahrenheit), which is much hotter than lightning.

Nuclear explosions:

The temperatures at the center of a nuclear explosion can reach tens of millions of degrees Kelvin (tens of millions of degrees Fahrenheit), making them hotter than lightning.

Fusion reactions:

In experimental fusion reactors, such as those in the ITER project, temperatures can reach over 150 million Kelvin (270 million degrees Fahrenheit) in order to achieve the conditions necessary for nuclear fusion.


When a massive star explodes in a supernova, the temperatures at the core of the explosion can reach billions of degrees Kelvin (billions of degrees Fahrenheit), far exceeding the heat of lightning.

Quark-gluon plasma:

This state of matter, which is believed to have existed shortly after the Big Bang, can reach temperatures of trillions of degrees Kelvin (trillions of degrees Fahrenheit). Researchers have recreated small amounts of quark-gluon plasma in particle accelerators like the Large Hadron Collider, where temperatures have reached up to 5.5 trillion Kelvin (9.9 trillion degrees Fahrenheit).

Man-made plasmas:

In experimental fusion reactors like the ITER project or the Large Hadron Collider, scientists have generated plasmas that reach temperatures of over 150 million Kelvin (270 million degrees Fahrenheit).

Arc welding:

The electric arc generated during welding processes can reach temperatures of around 20,000 to 30,000 Kelvin (35,540 to 53,540 degrees Fahrenheit), similar to or even hotter than lightning.


In conclusion, lightning is an incredibly hot natural phenomenon, with temperatures reaching up to 30,000 Kelvin (53,540 degrees Fahrenheit). This makes it hotter than the sun’s surface and molten lava, but not as hot as some other natural occurrences or man-made processes, such as the sun’s core, nuclear explosions, or experimental fusion reactions.

Understanding the reasons behind lightning’s extreme heat and how it compares to other phenomena helps us appreciate the immense power and energy found in nature and the marvels of human ingenuity.