weatherkit

name weatherkit description Fetch WeatherKit current, minute, hourly, and daily forecasts; weather alerts; iOS 18+ changes, historical comparisons, summaries, and statistics; and required Apple Weather attribution. Use when integrating weather data, showing forecasts or alerts, caching WeatherKit responses, displaying attribution, or reviewing WeatherKit query limits in iOS apps. WeatherKit Fetch current conditions, hourly and daily forecasts, weather alerts, and historical statistics using WeatherService . Display required Apple Weather attribution. Contents Setup Fetching Current Weather Forecasts Weather Alerts Selective Queries Context Queries Attribution Availability Common Mistakes Review Checklist References Setup Project Configuration Enable the WeatherKit capability in Xcode (adds the entitlement) Enable WeatherKit for your App ID in the Apple Developer portal Add NSLocationWhenInUseUsageDescription to Info.plist if using device location WeatherKit requires an active Apple Developer Program membership Import import WeatherKit import CoreLocation Creating the Service Use the shared singleton or create an instance. WeatherService conforms to Sendable ; keep app cache and UI state isolated separately. let weatherService = WeatherService .shared // or let weatherService = WeatherService () Fetching Current Weather Fetch current conditions for a location. Returns a Weather object with all available datasets. WeatherKit temperatures are Measurement<UnitTemperature> values; display them with .formatted() so units and number formatting follow the user's locale. func fetchCurrentWeather ( for location : CLLocation ) async throws -> CurrentWeather { let weather = try await weatherService.weather(for: location) return weather.currentWeather } // Using the result func displayCurrent ( _ current : CurrentWeather ) { let temp = current.temperature // Measurement<UnitTemperature> let condition = current.condition // WeatherCondition enum let symbol = current.symbolName // SF Symbol name let humidity = current.humidity // Double (0-1) let wind = current.wind // Wind (speed, direction, gust) let uvIndex = current.uvIndex // UVIndex print ( " \(condition) : \(temp.formatted()) " ) } Forecasts Hourly Forecast Returns 25 contiguous hours starting from the current hour by default. func fetchHourlyForecast ( for location : CLLocation ) async throws -> Forecast < HourWeather > { let weather = try await weatherService.weather(for: location) return weather.hourlyForecast } // Iterate hours for hour in hourlyForecast { print ( " \(hour.date) : \(hour.temperature.formatted()) , \(hour.condition) " ) } Daily Forecast Returns 10 contiguous days starting from the current day by default. func fetchDailyForecast ( for location : CLLocation ) async throws -> Forecast < DayWeather > { let weather = try await weatherService.weather(for: location) return weather.dailyForecast } // Iterate days for day in dailyForecast { print ( " \(day.date) : \(day.lowTemperature.formatted()) - \(day.highTemperature.formatted()) " ) print ( " Condition: \(day.condition) , Precipitation: \(day.precipitationChance) " ) } Custom Date Range Request forecasts for specific date ranges using WeatherQuery . Daily and hourly date-range queries use an inclusive startDate and exclusive endDate . They can include historical data from August 1, 2021. Forecasts are available up to 10 days in the future; each request returns at most 10 daily forecast days or about 240 hourly forecast hours. func fetchExtendedForecast ( for location : CLLocation ) async throws -> Forecast < DayWeather > { let startDate = Date .now let endDate = Calendar .current.date(byAdding: .day, value: 10 , to: startDate) ! let forecast = try await weatherService.weather( for: location, including: .daily(startDate: startDate, endDate: endDate) ) return forecast } For tomorrow-specific guidance, request the local tomorrow day interval rather than using minute forecasts: func fetchTomorrowForecast ( for location : CLLocation ) async throws -> Forecast < DayWeather > { let calendar = Calendar .current let tomorrow = calendar.startOfDay( for: calendar.date(byAdding: .day, value: 1 , to: .now) ! ) let dayAfterTomorrow = calendar.date(byAdding: .day, value: 1 , to: tomorrow) ! return try await weatherService.weather( for: location, including: .daily(startDate: tomorrow, endDate: dayAfterTomorrow) ) } Weather Alerts Fetch active weather alerts for a location. Alerts include severity, summary, and affected regions. func fetchAlerts ( for location : CLLocation ) async throws -> [ WeatherAlert ] ? { let weather = try await weatherService.weather(for: location) return weather.weatherAlerts } // Process alerts if let alerts = weatherAlerts { for alert in alerts { print ( "Alert: \(alert.summary) " ) print ( "Severity: \(alert.severity) " ) print ( "Region: \(alert.region ?? "Unknown region" ) " ) print ( "Details: \(alert.detailsURL) " ) // Non-optional and required for attribution } } For alert dashboards, name WeatherAvailability explicitly when discussing support checks: it exposes alertAvailability and minuteAvailability only, not a broad availability matrix for current, hourly, or daily weather. Selective Queries Fetch only the datasets you need to minimize API usage and response size. Each WeatherQuery type maps to one dataset. Single Dataset let current = try await weatherService.weather( for: location, including: .current ) // current is CurrentWeather Multiple Datasets let (current, hourly, daily) = try await weatherService.weather( for: location, including: .current, .hourly, .daily ) // current: CurrentWeather, hourly: Forecast<HourWeather>, daily: Forecast<DayWeather> Minute Forecast Available in limited regions. Returns precipitation forecasts at minute granularity for the next hour. let minuteForecast = try await weatherService.weather( for: location, including: .minute ) // minuteForecast: Forecast<MinuteWeather>? (nil if unavailable) Available Query Types Query Return Type Description .current CurrentWeather Current observed conditions .hourly Forecast<HourWeather> 25 hours from current hour .daily Forecast<DayWeather> 10 days from today .minute Forecast<MinuteWeather>? Next-hour precipitation (limited regions) .alerts [WeatherAlert]? Active weather alerts .availability WeatherAvailability Alert and minute forecast availability only .changes WeatherChanges? Significant upcoming weather changes (iOS 18+) .historicalComparisons HistoricalComparisons? Current weather compared to historical averages (iOS 18+) Context Queries For "unusual tomorrow" or "what is changing?" features on iOS 18+, request the optional .changes and .historicalComparisons results together: the first reports significant upcoming changes and the second provides historical context. let (changes, comparisons) = try await weatherService.weather( for: location, including: .changes, .historicalComparisons ) Historical summaries and statistics use WeatherService methods rather than WeatherQuery . Load references/weatherkit-patterns.md for their tuple ordering, APIs, and statistics-specific properties. Attribution Apple requires apps using WeatherKit to display attribution. This is a legal requirement. Fetching Attribution func fetchAttribution () async throws -> WeatherAttribution { return try await weatherService.attribution } Load references/weatherkit-patterns.md for the complete SwiftUI attribution view and cache integration. Attribution Properties Property Use combinedMarkLightURL Apple Weather mark for light backgrounds combinedMarkDarkURL Apple Weather mark for dark backgrounds squareMarkURL Square Apple Weather logo legalPageURL URL to the legal attribution web page legalAttributionText Text alternative when a web view is not feasible serviceName Weather data provider name Availability Check whether weather alerts or minute forecast data are available for a location. WeatherAvailability reports only alert and minute availability; other datasets, such as current weather, are expected to be supported for geographic locations. func checkAvailability ( for location : CLLocation ) async throws { let availability = try await weatherService.weather( for: location, including: .availability ) // Check specific dataset availability if availability.alertAvailability == .available { // Safe to fetch alerts } if availability.minuteAvailability == .available { // Minute forecast available for this region } } Common Mistakes DON'T: Ship without Apple Weather attribution Display the appropriate Apple Weather mark and link legalPageURL wherever WeatherKit data appears; use legalAttributionText only when the legal page cannot be shown. DON'T: Fetch all datasets when you only need current conditions Each dataset query counts against your API quota. Use the selective query shown in Selective Queries and fetch only what the UI displays. DON'T: Ignore minute forecast unavailability Minute forecasts are optional in unsupported regions. Check availability and handle the nil result instead of force-unwrapping it. DON'T: Forget the WeatherKit entitlement Without the capability enabled, WeatherService calls throw at runtime. // WRONG: No WeatherKit capability configured let weather = try await weatherService.weather(for: location) // Throws // CORRECT: Enable WeatherKit in Xcode Signing & Capabilities // and in the Apple Developer portal for your App ID DON'T: Make repeated requests without caching WeatherKit models include metadata.expirationDate . Cache responses until that expiration instead of inventing a fixed interval or fetching on every view appearance. Let a model or cache own loadIfNeeded ; the complete actor pattern is in references/weatherkit-patterns.md . Review Checklist WeatherKit capability enabled in Xcode and Apple Developer portal Active Apple Developer Program membership (required for WeatherKit) Apple Weather attribution displayed wherever weather data appears Attribution mark uses correct color scheme variant (light/dark) Legal attribution page linked or legalAttributionText displayed Only needed WeatherQuery datasets fetched (not full weather(for:) when unnecessary) Minute forecast handled as optional (nil in unsupported regions) Weather alerts checked for nil before iteration Alert detail links use non-optional detailsURL ; optional region is nil-safe Responses cached until each model's metadata.expirationDate WeatherAvailability used for alert/minute availability, not as a broad support matrix Location permission requested before passing CLLocation to service Temperature and measurements formatted with Measurement.formatted() for locale References Extended patterns (SwiftUI dashboard, charts integration, historical statistics): references/weatherkit-patterns.md WeatherKit framework WeatherService WeatherAttribution WeatherQuery WeatherQuery.daily(startDate:endDate:) WeatherQuery.hourly(startDate:endDate:) CurrentWeather CurrentWeather.temperature Measurement.formatted() Forecast HourWeather DayWeather WeatherAlert WeatherAvailability WeatherMetadata.expirationDate WeatherQuery.changes WeatherQuery.historicalComparisons WeatherKit updates Bring context to today's weather Fetching weather forecasts with WeatherKit