MeteoStorms
Country forecast

Geomagnetic storm forecast for Japan

No storm Capital: Tokyo 1297 citiesEstimate

The geomagnetic field over Japan is quiet: Kp 0.7 now, with the 72-hour peak near Kp 3.0. Across the country the effective exposure runs from about 2.1 at the least exposed cities to 2.7 at the most exposed.

Planetary Kp now0.7NOAA SWPC, live
72-hour peak3.0next 72 hours
Magnetic latitudes17.7–36.1°span across listed cities
Effective at peak2.1–2.7least → most exposed · estimate

Japan spans geomagnetic latitudes 17.7°–36.1°, so the same planetary storm is felt differently across it — higher magnetic latitudes get noticeably more. Open a city page for storm timing in its local time, its aurora threshold and wellbeing guidance.

Data: NOAA SWPC · GFZ Potsdam

Deep forecast · 72 hours

Next 72 hours over Japan

Planetary Kp by 3-hour windows — identical worldwide; the local feel scales with each city's latitude.

Deep forecast · 72 hours
Kp by 3-hour windows · with uncertainty
CalmActiveStormSevereUncertainty

Forecast peak Kp 3 around Jul 18, 03 AM.

01 · Week ahead

Seven-day geomagnetic forecast

Official NOAA Kp forecast with a general wellbeing-risk estimate for weather-sensitive people.

Today 16 Jul
3.3
Unsettled field
Quiet
General risk26%
Fr 17 Jul
2.0
No storm
Quiet
General risk14%
Sa 18 Jul
3.0
Unsettled field
Quiet
General risk23%
Su 19 Jul
1.7
No storm
Quiet
General risk13%
Mo 20 Jul
2.0
No storm · Estimate
Quiet
General risk14%
Tu 21 Jul
2.0
No storm · Estimate
Quiet
General risk14%
We 22 Jul
4.0
Active field · Estimate
Active
General risk32%
01 · Cities

Major cities in Japan

Estimated effective exposure at the coming peak (Kp 3.0). Open a city for its local timing and aurora odds.

Tokyo 2.4 27.9° magYokohama 2.4 27.6° magOsaka 2.4 26.6° magNagoya 2.4 27.2° magSapporo 2.6 35.4° magFukuoka 2.4 25.2° magKawasaki 2.4 27.7° magKobe 2.4 26.6° magKyoto 2.4 26.9° magSaitama 2.4 28.1° magHiroshima 2.4 26.1° magSendai 2.5 30.5° magChiba 2.4 27.8° magKitakyushu 2.4 25.4° magSetagaya 2.4 27.8° magSakai 2.4 26.5° magNiigata 2.5 30.1° magHamamatsu 2.4 26.8° magŌta 2.4 27.8° magKumamoto 2.3 24.4° magAihara 2.4 27.8° magOkayama 2.4 26.4° magSagamihara 2.4 27.7° magEdogawe 2.4 27.9° mag
02 · All pages

All cities in Japan

Showing the 200 most populous of 1297 cities.

FAQ

Japan: quick answers

Which cities in Japan feel geomagnetic storms the strongest?

The higher the geomagnetic latitude, the stronger the effect. Among the listed cities the most exposed are Asahikawa, Kushiro, Sapporo.

Can you see auroras in Japan?

It depends on latitude: Japan's cities sit between geomagnetic 17.7° and 36.1°. The closer a city is to the auroral oval, the lower the Kp it needs — each city page shows its own threshold and tonight's estimate.

Is the forecast different across Japan?

The Kp index is planetary — the same for all of Japan. What differs is the effective local exposure (2.1–2.7 at the coming peak) and the timing, which each city page shows in its own timezone.

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