metno.forecast

stable Standard

Current conditions and next-hour outlook (MET Norway locationforecast compact).

GET /v1/metno/forecast

What you get#

One Metno record in Onekey's unified shape, in data. If the record does not exist you get a 404 not_found and are not charged.

What it costs#

Standard · 1 credit for a fresh fetch, charged only when it succeeds.
Free when served from cache (0.2 credit for a cached response over 100 KB).
Free if the request is invalid (never charged) or the source fails or reports not found (refunded).

Parameters#

Name	Type	Required	Default	What it is	Constraints
`lat`	string	yes	(required)	Latitude (max 4 decimals)	max 8 chars; must match `-?\d{1,2}(?:\.\d{1,4})?`; trimmed
`lon`	string	yes	(required)	Longitude (max 4 decimals)	max 9 chars; must match `-?\d{1,3}(?:\.\d{1,4})?`; trimmed

Request#

curl "https://api.onekey.dev/v1/metno/forecast?lat=60.1&lon=9.6" \
  -H "x-api-key: YOUR_API_KEY"

Try it

Add your key to run this call right here. No key? Get one free. The key stays in this tab.

Recorded response#

A real Metno response, recorded and returned in Onekey's shape. Fields the platform does not provide are null.

json

{
  "success": true,
  "data": {
    "place": {
      "elevationM": 508
    },
    "entity": {
      "createdAt": "2026-09-28T19:31:45Z",
      "date": "2026-09-28T20:00:00Z",
      "category": "fair_night"
    },
    "ext": {
      "temperatureC": 7.9,
      "humidityPct": 71.3,
      "windSpeedMs": 2,
      "pressureHpa": 1021,
      "cloudCoverPct": 22.8,
      "precipitationNextHourMm": 0
    }
  },
  "metadata": {
    "platform": "metno",
    "endpoint": "forecast",
    "cached": false,
    "stale": false,
    "age_s": 0,
    "fetched_at": "2026-01-01T12:00:00+00:00",
    "credits_charged": 1,
    "request_id": "7f3a9c2e5b1d4c8fa2e6d0b9c4f18e37"
  },
  "error": null
}

Field mapping#

How this endpoint's source fields become Onekey's unified schema. Fields the source lacks come back as null.

Source path	Onekey field	Transform
`geometry.coordinates.2`	`place.elevationM`	`toNumber`
`properties.meta.updated_at`	`entity.createdAt`	`toIsoDate`
`properties.timeseries.0.time`	`entity.date`	`toIsoDate`
`properties.timeseries.0.data.instant.details.air_temperature`	`ext.temperatureC`	`toNumber`
`properties.timeseries.0.data.instant.details.relative_humidity`	`ext.humidityPct`	`toNumber`
`properties.timeseries.0.data.instant.details.wind_speed`	`ext.windSpeedMs`	`toNumber`
`properties.timeseries.0.data.instant.details.air_pressure_at_sea_level`	`ext.pressureHpa`	`toNumber`
`properties.timeseries.0.data.instant.details.cloud_area_fraction`	`ext.cloudCoverPct`	`toNumber`
`properties.timeseries.0.data.next_1_hours.summary.symbol_code`	`entity.category`	-
`properties.timeseries.0.data.next_1_hours.details.precipitation_amount`	`ext.precipitationNextHourMm`	`toNumber`

Caching and freshness#

Fresh for about 30 seconds. Repeat calls in that window are served from cache and are free.
Between 30 seconds and 5 minutes the cached copy is still served instantly and marked stale: true while Onekey refreshes it in the background.
If the source is down when a refresh is needed, the last copy can be served for up to 1 hour more (marked stale).
A "not found" is remembered for 1 minute and is free.
The cache is shared across all customers, which is what keeps repeat calls cheap.

What can go wrong#

Status	Code	What to do
401	`unauthorized`	Check the `x-api-key` header.
402	`insufficient_credits`	Add credits; your balance must cover the price.
404	`not_found`	That record does not exist. Free; do not retry.
422	`invalid_params`	Fix the parameters using the table above. Free.
429	`rate_limited`	Wait `Retry-After` seconds, then retry.
502	`upstream_error`	The source failed. Refunded; retry with backoff.

See Errors for the full list and retry guidance.

Status: stable (verified against the live source).