How do I check weather warnings and forecasts in Japan?

Learn where visitors can find official English forecasts, typhoon tracks and warnings from the Japan Meteorological Agency, and how to read its warning levels.

Published October 21, 2026 at 8:32 AM JST | By Tokyo Paul

Quick answer: Use the website of the Japan Meteorological Agency (JMA), which publishes forecasts, warnings, risk maps, typhoon information and satellite images in English. Warnings are graded by level, from advisories up to emergency warnings, and local governments add evacuation guidance. Phones in Japan also receive official emergency alerts, so keep notifications on and check JMA before outdoor plans.

Where the official information lives

The national source for weather in Japan is the Japan Meteorological Agency, usually shortened to JMA. Its English homepage links to forecasts, warnings, typhoon information, risk maps, satellite images and earthquake and volcano pages. The agency's disaster-prevention portal has an English setting, so visitors can switch the language and view maps of current conditions across the country.

Using the official source avoids confusion from rumors and out-of-date posts. The Japan National Tourism Organization's safety page also links to JMA for daily forecasts and current warnings, which makes it the standard starting point for anyone planning a day outdoors.

Local television and radio also carry warnings, and many hotel lobbies keep a screen tuned to the news. Station displays and announcements often add notes about delays. Combining the official website with these local sources gives a fuller picture than any single one, especially when weather is changing.

Step by step: reading forecasts and maps

Open the English page for weather forecasts and choose a region on the map, then a prefecture or area. The portal shows forecasts by area and also offers views for heavy rain and typhoons. The Risk Maps view shows a color-coded map of risk levels, which is useful when rain is forecast for mountains, rivers or steep coastal areas.

For a quick check, look at the next day's outlook and the probability of rain, then return to the page on the morning of travel. Satellite imagery is also available on the agency's pages for those who like to see the cloud pattern for themselves. Bookmark the page on the phone before leaving home for faster access.

Maps use colors to show levels of risk, and the legend explains each shade. Compare the map for your area with the forecast text, and look at the time stamp to be sure the information is current. Pages update regularly, so reload before leaving the accommodation.

Understanding warning levels

JMA warnings are issued by type of hazard. For heavy rain, floods, landslides and storm surges, the agency uses a five-level framework. Level 2 is an advisory, Level 3 is a warning in which elderly people and others who need more time should start evacuating, Level 4 is an urgent warning in which all residents should evacuate from dangerous areas, and Level 5 is an emergency warning.

Other hazards such as storms, heavy snow, high waves and dense fog have separate warnings and advisories. According to the tourism organization, advisories are issued when heavy rain or strong winds may cause damage, warnings when a serious disaster may occur, and emergency warnings signal a rare, devastating event that occurs about once every several decades.

JMA's wording makes clear that Level 5 is reserved for extraordinary events that far exceed normal warning criteria, and that residents should take every measure possible to protect themselves. Visitors who see that level should follow local instructions immediately and not continue with outdoor plans.

Typhoons and seasonal patterns

Typhoons are tropical storms that affect Japan mostly in late summer and autumn, although the exact timing varies from year to year. JMA's English pages include typhoon information and track forecasts that update as a storm moves. Rainy season conditions in early summer can also bring heavy rain, which is why checking the forecast matters even before a typhoon appears.

Because storms can change quickly, travelers should check updates at least morning and evening during stormy periods. JMA notes that its heavy rain and typhoon section offers real-time information. Confirm the current rainy-season and typhoon timing on official pages, since dates differ across regions and years.

Winter brings its own conditions, including heavy snow on the Sea of Japan side and in mountain regions, and JMA issues snow and wind warnings for those areas. Spring and autumn are generally calmer, but a quick forecast check remains a good habit in every season.

Special cases for different travelers

Families with young children can plan indoor alternatives such as museums or aquariums and check conditions the evening before. Hikers and campers should watch for heavy rain, landslide and river risk, as mountain weather can change quickly. Older travelers may prefer to schedule long outdoor walks in calmer weather and remember that evacuation needs more time for people who move slowly.

Travelers on a rail pass or flexible schedule can adjust plans if a typhoon is forecast, and those with fixed flights should check airline and airport notices through official channels. Local tourist information centers can also help interpret forecasts and warnings in English.

Common mistakes and misunderstandings

A common mistake is relying on a single day's forecast for a long trip. Weather can differ widely between regions, so check each stop. Another is confusing the warning levels: a Level 3 warning already means that people who need more time should start evacuating, so it is not only a "heads-up". A third is waiting for a siren or local message before acting on official alerts on a phone.

Some visitors also assume that weather pages are only in Japanese. The agency maintains English pages for key information, but not every detail is translated, so use the maps and symbols and ask accommodation staff for help interpreting local announcements.

Another frequent error is to look only at temperature and ignore wind and rain signals on the map. Strong wind and high waves can close ferries and coastal paths even when the sky looks pleasant, so read the full forecast before heading to islands or shorelines.

Practical next steps

Before departure, bookmark JMA's English homepage and the forecast and risk map pages. Keep phone notifications on for emergency alerts, and ask accommodation staff about the nearest evacuation shelter when heavy weather is expected. The tourism organization also provides a safety tips page and app.

Confirm current information on the official pages whenever plans depend on the weather. This guide shares general information, not professional advice; for health concerns, talk with a doctor or local clinic. Warning systems and web pages are updated from time to time, so check the agency's site for the latest wording.

Frequently Asked Questions

Is there an English version of Japan's official weather site?

Yes. JMA has English pages for forecasts, warnings, typhoon information, earthquakes and volcanoes, and its disaster-prevention portal has an English setting. Some local details appear only in Japanese, so use maps and symbols to interpret them.

What is the difference between an advisory and a warning?

An advisory is issued when heavy rain or strong wind may cause damage, while a warning is issued when a serious disaster may occur, according to the tourism organization. Higher levels, such as urgent and emergency warnings, call for evacuation or maximum protection.

Do travelers need to follow local evacuation announcements?

Yes. Local governments issue evacuation guidance based on official warning levels, and Level 4 means all residents should evacuate from dangerous areas. Visitors should follow staff and municipal instructions and ask their accommodation where the designated shelter is.

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