Weather
14-Day Weather Forecast Maps for Japan: Wind, Rain, Snow, Temperature
Forecast maps of Japan for the next 14 days: wind, rain, snow, temperature, clouds, pressure, gusts, snow depth and waves. Free, no ads.
The layers
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Steady wind speed (not gusts) 10 m above the ground at the time shown, in m/s. Moving lines show which way the wind blows.
- Good for
- Seeing where strong winds are and where they come from.
- Watch out
- Ridges, passes and summits are often much windier than shown, while valleys can be calmer.
-
Air temperature 2 m above the ground, in °C.
- Good for
- Seeing where it is below freezing, and whether rain may fall as snow.
- Watch out
- High ground is usually colder than shown, by about 0.6 °C for every 100 m you climb, and wind makes it feel colder still.
-
Total rain and snow, as millimeters of water, that falls between the previous time on the timeline and the time shown. Later times are further apart, so each value covers more hours.
- Good for
- Seeing when and where rain or snow is likely.
- Watch out
- Showers and thunderstorms are very local and can hit places shown as dry.
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How cloudy the sky looks, in %. Thin high cloud counts for less than low cloud. Dotted color marks rain or snow.
- Good for
- Finding clear spells for views, and watching cloud come and go.
- Watch out
- It does not show how high the cloud is, so a summit can be in cloud or fog even when few clouds are shown.
Japan Cloud Cover Forecast Map: Clear Skies and Stargazing, 14 Days
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Air pressure at sea level, in hPa. Lines join places with the same pressure, every 2 hPa, and appear on every layer. H and L mark high and low centers.
- Good for
- Spotting low-pressure systems, which often bring bad weather.
- Watch out
- Falling pressure often means worse weather is coming, and closely packed lines mean strong wind.
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The strongest gust 10 m above the ground between the previous time on the timeline and the time shown, in m/s.
- Good for
- Judging how exposed ridges will feel, and whether lifts may stop.
- Watch out
- Gusts can knock you off balance on exposed ground, and are often stronger in the mountains than shown.
-
Snowfall the model expects over the time you choose, starting at the time shown, in cm.
- Good for
- Seeing where fresh snow may fall.
- Watch out
- Real amounts vary a lot with elevation and wind, and light powder piles up deeper than wet snow. Heavy new snow also raises avalanche danger.
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Modeled depth of snow on the ground, in cm.
- Good for
- Seeing roughly where there is snow cover.
- Watch out
- It is a calculation, not a measurement, and says nothing about avalanche danger or snow quality.
-
Typical height of the bigger waves at sea, in m. Single waves can be almost twice as high. Moving lines show which way the waves travel; faster lines mean longer swell.
- Good for
- Checking the sea, for example before a ferry or a trip along the coast.
- Watch out
- Waves close to the shore can be very different from waves out at sea.
About weather maps
Weather maps show predictions from weather models. Use them as a rough guide. The timeline covers about the next 14 days, with a time every 2–3 hours at first and every 6 hours after about day 6. The further ahead you look, the less reliable they are. Each value covers an area at least about 9 km across, so altitude and terrain can make the real weather very different from what is shown, especially on peaks, ridges and in valleys.
Reading the screen
- Switch layers
- Choose a layer in the list below, or from the layers button at the top left of the map.
- Move through time
- Drag the timeline at the bottom of the map to pick a time, or press play to watch the weather change. Times are in your device’s time zone.
- Read the colors
- The color bar under the timeline shows what each color means, with the unit on the right.
- Check a spot
- Click or tap the map to see the value at that spot.
- New snow
- Choose how long to add up from the time shown, from 12 hours to 8 days.