WeatherAction is a long-range weather forecasting organisation founded and managed by astrophysicist Piers Corbyn. It describes its forecasting approach as a solar-based method, which it is developing for use across countries and for predicting weather patterns and extreme events months or years ahead. The organisation provides monthly forecasts for Britain and Ireland, Europe, and the United States, with services extending from 30 days to around four or five months. Forecast products are offered in several formats, including regional European maps and pressure scenarios, seasonal packages, and updates where needed. Longer-range forecasts of up to 12 months and consultation services are also available by direct enquiry.

Alongside forecasts, WeatherAction publishes news, videos, reports, and commentary on weather and solar activity through its website, social media channels, and subscriber materials. Its stated mission also includes support for biodiversity and wildlife, reduced chemical and particulate pollution, and evidence-based policy. The organisation takes a critical position on mainstream explanations of climate change and disputes claims that human-caused carbon dioxide drives warming.