# Forecast A forecast collection for minute, hourly, and daily forecasts. ``` struct Forecast where Element : Decodable, Element : Encodable, Element : Equatable, Element : Sendable ``` ## Overview [`Forecast`](/documentation/WeatherKit/Forecast) conforms to the `RandomAccessCollection` protocol to support efficient random-access index traversal through forecast types. The protocol involves forwarding the required properties and methods to the underlying forecast collection. The implementation of `subscript` returns an instance of the `Element` type. ## Topics ### Creating the forecast [`init(from:)`](/documentation/WeatherKit/Forecast/init(from:)-390k1) [`init(from:)`](/documentation/WeatherKit/Forecast/init(from:)-4wobg) ### Serializing objects [`encode(to:)`](/documentation/WeatherKit/Forecast/encode(to:)-5zuqd) [`encode(to:)`](/documentation/WeatherKit/Forecast/encode(to:)-fbco) ### Getting the properties [`endIndex`](/documentation/WeatherKit/Forecast/endIndex) The forecast end index. [`forecast`](/documentation/WeatherKit/Forecast/forecast) The forecast collection. [`metadata`](/documentation/WeatherKit/Forecast/metadata) Descriptive information about the forecast data. [`startIndex`](/documentation/WeatherKit/Forecast/startIndex) The forecast start index. [`summary`](/documentation/WeatherKit/Forecast/summary) A convenient localized description of the minute forecast. ### Accessing elements [`subscript(_:)`](/documentation/WeatherKit/Forecast/subscript(_:)) The forecast element at the provided index. [`Index`](/documentation/WeatherKit/Forecast/Index) The forecast index. ### Comparing forecasts [`==(_:_:)`](/documentation/WeatherKit/Forecast/==(_:_:)) ## Relationships ### Conforms To [`Sequence`](/documentation/Swift/Sequence) [`RandomAccessCollection`](/documentation/Swift/RandomAccessCollection) [`Decodable`](/documentation/Swift/Decodable) [`Collection`](/documentation/Swift/Collection) [`SendableMetatype`](/documentation/Swift/SendableMetatype) [`Sendable`](/documentation/Swift/Sendable) [`Encodable`](/documentation/Swift/Encodable) [`Equatable`](/documentation/Swift/Equatable) [`BidirectionalCollection`](/documentation/Swift/BidirectionalCollection) --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)