If you're looking for something other than Pirate Weather, Weather Machine is another good option. This service combines weather data from several forecast APIs, including AccuWeather, AerisWeather and The Weather Company, into one interface. It provides both Dark Sky-compatible JSON and GraphQL interfaces so you can use it the way you like best. The forecast-aware caching system is designed to minimize network usage while still delivering fast and accurate results, and it's geared for developers and businesses.
Another good option is Tomorrow.io, which offers hyper-accurate weather data and forecasts geared for businesses. It offers current weather data up to 14 days in advance, historical weather data going back up to 20 years, and features like predictive workflows and probabilistic forecasting. It's geared for businesses that want to mitigate weather risks and optimize operations, and it offers a variety of APIs and other integration options for different needs.
Atmo is another contender, particularly if you want hyperlocal weather forecasts. It combines satellite, ground station, radar and ocean buoy data with deep learning models for high-speed, high-accuracy forecasts. It's geared for applications that require fine-scale weather data, so it's good for government and enterprise use.
Last is Rainbow, which offers hyperlocal forecasts with 1-minute temporal resolution and 1-square-kilometer spatial resolution. Its API is geared for businesses that need precise weather data, including ridesharing, same-day delivery, aviation and solar energy. Rainbow offers pay-as-you-go pricing and custom enterprise pricing, so it's good for businesses that want to use it without a big upfront commitment.