1km Mesh UV Index
GET
/api/v1/uv
Forecast Japan
Access UV index for specified latitude and longitude coordinates, calculated with 1km grid resolution. The specified latitude and longitude must be within Japan. The UV index includes hourly information for 72 hours. The UV index is provided year-round (recommended period: early May to late August).
Index Codes
| Code | Description |
|---|---|
| 0 | - |
| 1 | Weak |
| 2 | Weak |
| 3 | Moderate |
| 4 | Moderate |
| 5 | Moderate |
| 6 | Strong |
| 7 | Strong |
| 8 | Very Strong |
| 9 | Very Strong |
| 10 | Very Strong |
| 11 | Extremely Strong |
Data Coverage
Land areas of Japan
Parameters
Query Parameters
lat*
Latitude
Typenumber
RequiredExample
35.651377format
floatlon*
Longitude
Typenumber
RequiredExample
140.041161format
floatResponses
1km grid-based UV 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",
"uv": 4,
"uvidx": 1
}
]
}
]
}