1km Mesh High-Resolution Historical Weather Data
GET
/api/v1/ss1obs
Get historical weather data for specified latitude and longitude coordinates, calculated with 1km grid resolution.
By specifying a date, you can retrieve historical data for that date. Historical data is available from 2018-01-01 onwards, with an observation frequency of 1 hour. The specified latitude and longitude must be within Japan.
Please note that there may be missing data due to various reasons such as maintenance or equipment failures. Missing values are represented as -99 or -9999. The data for the previous day is updated at 3 AM JST.
For definitions of weather codes and icons, refer to Weather Codes (Forecast).
For wind direction definitions, refer to Wind Direction Definitions.
Parameters
Query Parameters
lat*
Latitude
Typenumber
RequiredExample
35.651377format
floatlon*
Longitude
Typenumber
RequiredExample
140.041161format
floatdate
Date(JST)
Typestring
Example
2025-04-09format
dateResponses
1km grid-based historical weather 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",
"wx": 100,
"temp": 22,
"prec": 0,
"arpress": 1011,
"wndspd": 0,
"wnddir": 0,
"rhum": 43,
"feelidx": 5,
"feeltmp": 20
}
]
}
]
}