---
title: "Hong Kong Observatory 9-day forecast"
method: GET
path: "/api/v1/data-gov-hk/hko/forecast-9day"
tags: ["Public Finance & Government"]
---

# Hong Kong Observatory 9-day forecast

`GET /api/v1/data-gov-hk/hko/forecast-9day`

Nine-day daily forecast from the Hong Kong Observatory (dataType=fnd). Each day includes maximum / minimum temperature, maximum / minimum relative humidity, wind description, weather narrative, icon code, and the probability-of-significant-rain bucket. The response also carries the general-situation narrative and spot sea / soil temperature readings. Upstream refreshes hourly; Sugra caches for 10 minutes.

## Query parameters

- `lang` string — HKO response language: `en`, `tc`, or `sc`.

## Response `200`

Nine-day daily forecast with narrative, temperatures, humidity, and icon codes.

- EnvelopeHkoForecast9DayPayload
  - `data` HkoForecast9DayPayload, required — Response payload for `/api/v1/data-gov-hk/hko/forecast-9day`.
    - `lang` string, required — HKO language code echoed back.
    - `update_time_utc` string, nullable — Upstream updateTime as ISO 8601 UTC.
    - `update_time_hkt` string, nullable — Original upstream updateTime as published in HKT (+08:00).
    - `general_situation` string, nullable — HKO narrative description of the general weather situation.
    - `days` HkoForecastDay[], required — Nine-day daily forecast table (chronological).
      - `forecast_date` string, nullable — Upstream forecast date as `YYYYMMDD` (HKT).
      - `forecast_date_utc` string, nullable — Forecast date start-of-day as ISO 8601 UTC.
      - `week` string, nullable — Day-of-week label (localised).
      - `forecast_wind` string, nullable — Forecast wind description.
      - `forecast_weather` string, nullable — Forecast weather narrative.
      - `max_temp_c` union — Forecast maximum temperature (degrees Celsius).
        - number
        - integer
      - `min_temp_c` union — Forecast minimum temperature (degrees Celsius).
        - number
        - integer
      - `max_rh_pct` union — Forecast maximum relative humidity (percent).
        - number
        - integer
      - `min_rh_pct` union — Forecast minimum relative humidity (percent).
        - number
        - integer
      - `icon` integer, nullable — HKO forecast icon code.
      - `psr` string, nullable — Probability-of-significant-rain bucket (`Low`, `Medium Low`, `Medium`, `Medium High`, `High`).
    - `sea_temperature` object, nullable — Sea-surface temperature reading (place, value, unit, recordTime).
    - `soil_temperature` object[] — Soil temperature readings at varying depths.
  - `meta` SugraMeta, required — Metadata attached to every /api/v1/* response envelope.
    - `endpoint` string, required — Requested endpoint path.
    - `data_time` string, required — ISO 8601 UTC timestamp of the source data, not of the request.
    - `response_time` string, required — ISO 8601 UTC timestamp when this response was produced.
    - `provider` string, required — API name and version.
    - `source` string, nullable — Identifier of the primary upstream source used for this response.
    - `attribution` string, nullable — Human-readable attribution mandated by an upstream source (e.g. a securities regulator or self-regulatory organization). Present only on responses whose source requires the owner and source to be clearly identified. Do not remove or alter it when using the response.
    - `fallback_used` boolean, nullable — True when the primary source failed and a fallback produced the data.
    - `fallback_chain` string[], nullable — Ordered list of sources attempted, in the order they were tried.
    - `cached` boolean, nullable — True when this response was served from the internal cache.
    - `stale` boolean, nullable — True when the cached response was returned after the upstream rate-limited or errored. Clients can use this to detect degraded data.

## Other responses

- `401` — Missing or invalid `x-api-key` header.
- `422` — Validation Error
- `429` — Daily rate limit exceeded. Check `X-RateLimit-Reset` for the next window.
- `503` — Upstream source is temporarily unavailable. Retry after a short delay.

---

[API](https://skmtc.net/sugra/apis/sugra-api.md) · [All operations](https://skmtc.net/sugra/apis/sugra-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/sugra/sugra-api/versions/4e2740743eb4/schema)