Lightning in Japanese is 雷, said kaminari. Thirteen strokes: the rain radical 雨 sitting over 田. It covers the thunder and the bolt together, which is the first thing English speakers need to unlearn. Written in hiragana it is かみなり, and in katakana カミナリ.
Lightning in Japanese
Lightning in Japanese is 雷, and the spoken word is kaminari. But 雷 is one word doing two English jobs. It is the thunder you hear and the thunderbolt that causes it, undivided. When someone says 雷が鳴っている they mean thunder is rumbling. When they say 雷が落ちた they mean lightning struck.
If you specifically mean the flash you can see, Japanese has 稲妻 (inazuma) and 稲光 (inabikari). Those name the visible bolt and nothing else. And the on’yomi ライ (rai) runs through the technical vocabulary: 雷雨 (raiu, a thunderstorm), 落雷 (rakurai, a lightning strike).
The Kanji for Lightning: 雷
- Character: 雷
- On’yomi: ライ (rai)
- Kun’yomi: かみなり (kaminari), いかずち (ikazuchi)
- Stroke count: 13
- General meaning: thunder, lightning, thunderbolt
- Radical: 雨 (rain), Kangxi radical 173, with five strokes added below
It is a jouyou kanji taught in junior high rather than primary school, and it sits at JLPT N1, which reflects how often it appears in written Japanese rather than how hard the word is.
Japanese Symbol for Lightning
雷 is a phono-semantic compound, and it used to be much bigger. The old form was 靁, with the rain radical over three 田 elements, and it was 畾 underneath that supplied the sound. Somewhere along the way scribes dropped two of the three and kept one, which is how the modern thirteen-stroke character came about.
So the honest reading is: a weather phenomenon, filed under rain, pronounced rai. The single 田 at the bottom is a survivor of a phonetic component, not a picture of a field and not a picture of anything else.
The 雨 radical on top is the real information. It gathers everything that falls or hangs in the sky: 雪 (yuki, snow), 雲 (kumo, cloud), 霧 (kiri, fog), 露 (tsuyu, dew), 霜 (shimo, frost), and 電 (den), which meant lightning first and now means electricity. Japanese classified the storm before it classified the current.
How to Write 雷 in Japanese
Thirteen strokes, top before bottom, and the rain radical takes the first eight.
Begin with the short horizontal at the very top. Then the left vertical of the box below it. Then the stroke that runs across the top of that box and turns down the right side. Then the vertical through the middle. Then the four short dots inside, written as two columns: left upper, left lower, right upper, right lower.
Then 田 in five, the same way any enclosure is written. The left vertical, then the stroke crossing the top and turning down the right, then the vertical inside, then the horizontal inside, and last of all the bottom stroke that closes the frame.
Keep 雨 wide and slightly flattened. As a radical on top it compresses, and the four dots inside need visible gaps. That is the part that fills in first when the character is written small.
How to Say Lightning in Japanese
Kaminari is four even beats: “kah-mee-nah-ree.” Every vowel is short, the r is the light Japanese tap, and no syllable is stressed. English speakers tend to lean on the second beat. Keep it flat instead. Inazuma is “ee-nah-zoo-mah,” also four beats, and rai rhymes with “rye.”
Real sentences:
- 雷が鳴っています。(Kaminari ga natte imasu.) It is thundering.
- 雷が怖いです。(Kaminari ga kowai desu.) I’m afraid of thunder.
- 木に雷が落ちた。(Ki ni kaminari ga ochita.) Lightning struck the tree.
- 空が稲妻で光った。(Sora ga inazuma de hikatta.) The sky flashed with lightning.
- 明日は雷雨の予報です。(Ashita wa raiu no yohou desu.) Thunderstorms are forecast for tomorrow.
Words and Compounds With 雷
| Word | Reading | Meaning |
|---|---|---|
| 雷雨 | raiu | thunderstorm |
| 雷雲 | raiun | thundercloud |
| 落雷 | rakurai | a lightning strike |
| 雷鳴 | raimei | a thunderclap |
| 避雷針 | hiraishin | lightning rod |
| 雷神 | raijin | the thunder god |
| 地雷 | jirai | land mine |
| 魚雷 | gyorai | torpedo |
That bottom half is worth noticing. Because 雷 carries the sense of a sudden destructive blast, Japanese used it to name explosives: 地雷 is a land mine, 機雷 is a naval mine, 魚雷 is a torpedo. In modern slang 地雷 also means a topic that sets someone off, or a purchase that looked fine and turned out badly.
There is also a lovely piece of etymology in 稲妻 (inazuma). The parts are 稲 (ina, rice plant) and 妻 (tsuma, spouse), voiced to zuma. It comes from an old belief that lightning fertilized the rice, which made sense in late summer and autumn, when storms and ripening arrive together.
Lightning in Japanese Culture
The storm has a face. Raijin, written 雷神 with the same character, is the Shinto god of thunder, painted and carved as a fierce demon-bodied figure crouched in the clouds inside a ring of drums, striking them with two mallets. He is almost always shown with Fujin, the wind god, as a pair.
You can stand under both of them. The Kaminarimon, 雷門, the Thunder Gate, is the outer gate of Senso-ji in Asakusa, Tokyo, with Fujin on the east side and Raijin on the west. Its official name is 風雷神門, the Gate of the Wind and Thunder Gods. The current structure was dedicated in December 1960, rebuilt with a donation from Konosuke Matsushita after the old gate burned in 1865.
The god is close enough to everyday life to have a nickname, 雷様 (kaminari-sama), and a superstition attached. When a storm rolls in, Japanese parents tell children to cover their navels, because the thunder god comes to take belly buttons. The likeliest practical reading is that it got children to keep their stomachs warm when the temperature dropped, which is the sort of thing folklore is quietly good at.
As a Tattoo
雷 is a strong tattoo character. Thirteen strokes give it real density, and the split between the wide rain radical on top and the compact box below makes a stable, architectural shape that suits both brush and blackwork styles.
Understand what it says. 雷 is thunder and lightning as a weather event and as a divine one. It does not say “speed” or “power” or “electricity” in the modern sense. Electricity is 電 (den). If the thunder god is the point rather than the weather, 雷神 (raijin) says that in two characters and is a common, well-understood choice.
Check every pairing. 地雷 is a land mine, 魚雷 is a torpedo, 機雷 is a naval mine. Each of those is 雷 plus one innocuous-looking character, and none of them is what anyone means by a lightning tattoo. Kanji next to each other form real dictionary words rather than a sum of ideas.
On script: 雷 is written identically in Japanese, simplified Chinese, and traditional Chinese, so there is no variant form to choose between. Only the sound changes, kaminari or rai in Japanese and léi in Mandarin.
Size matters more here than placement. The four dots inside the rain radical are the fine detail, and they merge into a smear if the piece is inked small or on a high-movement area. The forearm, the outer shoulder, and the calf all give the character the room it needs.
Confirm with a native speaker before you ink. You can preview the character in vertical and horizontal layouts with the Japanese Tattoo Generator, and read the wider background in our guide to japanese tattoo meanings.
Related Kanji
FAQ
How do you say lightning in Japanese?
You say kaminari, written 雷. Four flat beats, “kah-mee-nah-ree,” with no stress on any of them. That single word covers both the thunder and the bolt. If you mean only the visible flash, use 稲妻 (inazuma) or 稲光 (inabikari), which name the streak of light and nothing else.
What is the kanji for lightning?
The kanji for lightning is 雷, thirteen strokes, built from the rain radical 雨 over 田. It is Kangxi radical 173 with five strokes added. Readings are かみなり (kaminari) and ライ (rai). The older form of the character was 靁, with three 田 elements rather than one.
What is the Japanese symbol for lightning?
雷 is the written symbol, filed under rain along with snow, cloud, fog, and frost. The cultural symbol is a figure rather than a character: Raijin, 雷神, the thunder god in his ring of drums. His image on the Kaminarimon gate at Senso-ji is the most photographed lightning symbol in Japan.
How do you write kaminari in Japanese?
Three ways. 雷 is the kanji and the standard written form. かみなり is hiragana, used in children’s books and casual writing. カミナリ is katakana, which adds emphasis or a comic-book crack, and shows up in manga sound effects and band names. All three are read the same way.
Is 雷 the same character in Chinese?
Yes. Simplified Chinese, traditional Chinese, and Japanese all write it as 雷, with no variant forms to choose between, and it means thunder in both languages. Only the sound changes, kaminari or rai in Japanese and léi in Mandarin. It is a safe character to copy from a reference image.
Why does 稲妻 mean lightning?
Because of an old agricultural belief. 稲 (ina) is the rice plant and 妻 (tsuma, voiced to zuma) is a spouse, so the word literally reads as the rice plant’s partner. Farmers connected late summer storms with ripening grain and concluded that lightning fertilized the crop.