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Solar resource assessment and forecasting data for irradiance and PV power. Created using a global fleet of weather satellites. Independently validated. Free to try. Access our data in just a few minutes with the Solcast API Toolkit.

What our customers say

Adding Solcast's weather data in our hydrogen storage systems improved our control strategy that responds well to weather patterns.

Meinhard Ploner

GKN Hydrogen

Forecasts are crucial in optimizing renewable power plants with predictive controls. Solcast’s forecasts, and the resulting decisions we make with them, are front and center for our operators.

Stephen Schneider

Wärtsilä

On top of our sophisticated solar modelling, Solcast's accurate data has elevated what we already have and allowed us to expand to new geographies.

Rachel Liddell

Aurora Solar

Accurate real-time and forecasted weather data is crucial for assessing plant performance and maximizing the value of clean energy assets.

Taylor Grafton

Also Energy

Solcast's "Estimated Actuals" closes the gap for our owned and third-party solar portfolios.

Cypress Creek Renewables

As far as we know, there's no provider that can provide a more accurate forecast.

Samuel Muhr

Hymate

Solar data services… in the cloud

We built a new approach to solar forecasting and modeling technology from the ground up, using the latest in weather satellite imagery, machine learning, computer vision and big databases. We crunch more than 600 million new forecasts every hour in a cloud-based environment on AWS and provide real-time access to our data via API. Use the API Toolkit to access nearly 20 years of historical data, including TMY files.

Historical and TMY Data

  • Low uncertainty, zero bias, bankable dataset
  • Independent validation & global coverage
  • High resolution data: Up to 5 minute / 90 metre resolution
  • PV modelling software integration (PVSyst, SAM, TMY3, CSV)
  • Solar irradiance (GHI, DNI, DHI)
  • Weather (Temp, Wind, Humidity, Snow, etc)
  • Includes aerosol impacts (tracking of smoke, dust, haze)

Live and Forecast Data

  • Solar irradiance data (GHI, DNI, Diffuse)
  • Weather (Temp, Wind, Humidity, Snow, etc)
  • PV power modelling (Rooftop or Utility Scale)
  • Fully-global coverage
  • Rapid update (new forecasting data every 5-15 minutes)
  • Proprietary cloud & aerosol detection (tracking smoke, dust, haze)
  • Probabilistic forecasting outputs
  • Real-time data through to 14 days ahead at 5, 10, 15, 30 & 60 minute resolution
  • Delivered via REST API (download CSV or JSON)
Try it for free, no credit card required.

Latest Posts

Jet stream shift brings gloom to Northern Europe in December

Northern Europe faced a gloomy December with solar irradiance 30% below average due to persistent cloud cover, while the Iberian Peninsula and Northern Italy enjoyed up to 30% above-average irradiance.

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Bright US Midwest contrasts with cloudy coasts in 2024

While the Midwest achieved solar irradiance gains of up to 10% above average in 2024, coastal regions, including California and the Gulf Coast, experienced below-average sunshine due to persistent cloud cover and weather systems.

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2024 delivers mixed solar outcomes despite heat records

Despite 2024 being the second hottest year on record, solar irradiance varied significantly across regions. Check the full analysis using the Solcast API.

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