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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.
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You're in good company

JEDLIX
Duke Energy
GKN Hydro
Aemo
Wartsila
hymate
GE Digital
Icepco
Iberdrola
Canadian Solar
M&M
EDF
Also Engery
Aurora
Steag
Cypress Creek
Enel
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Engie
Adani

What our customers say

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

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

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

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)
  • Accessible bankable data source for resource assessment
    via     DNV's Solar Resource Compass

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.

Learn more about our data

Latest Posts

Shifting cloud patterns boost solar potential in the Amazon

As solar irradiance in the Amazon Basin climbs 10% above average—driven by drier conditions and shifting cloud patterns—southern South America experiences dramatic swings, with floods cutting irradiance by up to 20% in some regions.

Read Post

High pressure ridge splits Australia’s solar output in Autumn

Autumn 2025 saw contrasting solar performance in Australia: East Coast underperformed while the West and South saw gains. Learn how high pressure shaped irradiance patterns.

Read Post

East Coast irradiance dips as storm systems dominate May

East Coast solar underperformed in May due to storms, while West and Midwest saw stable conditions. Learn what drove this split in solar conditions.

Read Post

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