A Swift Package for the Open-Meteo APIs.

Open-Meteo is an open-source weather API and offers free access for non-commercial use. No API key is required. You can use it immediately!

• Async/await transport built on URLSession.
• Endpoint-specific query structs for forecast, historical, air quality, ensemble, marine, flood, climate, elevation, and geocoding.
• Shared query encoding.
• Commercial API key handling with the customer- host prefix used by Open-Meteo.
• Dynamic daily/hourly response tables that glue units and timestamped values into UnitTimeSeries.
• Field catalogs such as Forecast.Hourly.temperature2m and Marine.Daily.waveHeightMax, while still allowing custom Variable("...") values.

import OpenMeteo

let openMeteo = OpenMeteo(latitude: 52.3738, longitude: 4.8910)
let forecast = try await openMeteo.forecast {
    $0.daily = [
        Forecast.Daily.weatherCode,
        Forecast.Daily.temperature2mMax,
        Forecast.Daily.temperature2mMin
    ]
    $0.hourly = [Forecast.Hourly.temperature2m]
    $0.windSpeedUnit = .metresPerSecond
    $0.timezone = .auto
    $0.pastDays = 1
    $0.currentWeather = true
}

if let maxTemperature = forecast.daily[Forecast.Daily.temperature2mMax] {
    print(maxTemperature.unit)
    print(maxTemperature.values)
}

let place = try await Geocoding.Search.first(name: "Tokyo", language: "en")
let openMeteo = OpenMeteo(latitude: place.latitude, longitude: place.longitude)

• Open-Meteo, "Free weather forecast and historical weather API — 30+ models, historical weather from 1940, no API key required."