1km Mesh Heat Stroke Risk Index（WBGT）
GET
/api/v1/wbgt
Get heat stroke risk index for specified latitude and longitude coordinates, calculated with 1km grid resolution. The specified latitude and longitude must be within Japan. The heat stroke risk index includes hourly information for 72 hours. The heat stroke risk index is provided from May to the end of September.
Index Codes
| Code | Description |
|---|---|
| 0 | Almost Safe |
| 1 | Caution |
| 2 | Warning |
| 3 | Severe Warning |
| 4 | Physical Activity Suspended |
Forecast Update Times
Updates are made around the following times:
- 1:55 AM
- 3:55 AM
- 10:45 AM
- 2:40 PM
- 9:40 PM
Note: Manual updates may occur at times other than the above.
Parameters
Query Parameters
lat*
Latitude
Typenumber
RequiredExample
35.651377format
floatlon*
Longitude
Typenumber
RequiredExample
140.041161format
floatResponses
1km grid-based heat stroke risk index data
application/json
JSON
{
"requestId": "3909775c-5d0f-4e96-8e4f-7d3f263e2056",
"wxdata": [
{
"lat": 35.651377,
"lon": 140.041161,
"data": [
{
"date": "2025-04-09T10:00:00+09:00",
"wbgt": 4,
"wbgtidx": 1
}
]
}
]
}