Wind Solar Radiation Data - Historical and TMY

Validated historical solar irradiance and meteo data

High quality solar irradiance and weather data, timeseries and TMY

Based on our proprietary satellite cloud and aerosol tracking. Solar irradiance and weather data extending back up to 15 years, with high accuracy and near zero bias.


Our customers use our historical and TMY data to:

  • Plan and finance new solar projects

  • Estimate PV system yields with modelling tools including PVsyst, PlantPredict, SAM, PV*SOL, Homer

  • Conduct research (we offer historical data credits to public researchers)


Data Specifications


  • Global Horizontal Irradiance (GHI)
  • Direct Normal Irradiance (DNI)
  • Diffuse Horizontal Irradiance (DIF, DHI)
  • Cloud Opacity
  • Temperature
  • Solar zenith angle
  • Solar azimuth angle
  • Wind Speed
  • Wind direction
  • Relative humidity
  • Surface pressure
  • Precipitable water

Spatial coverage

All continents except Antarctica.

Time granularity

Period Mean: 5, 10, 15, 20,30 or 60 minutes (period mean, labelled with period-end time)

Native Satellite: 5 minute period-mean values, labelled with period-center time

Update frequency

Every 10 or 15 minutes

Time span

15 years ago to 2-7 days ago

File formats

  • Solcast standard CSV
  • TMY3
  • SAM
  • PVsyst

Access method

Data can be ordered and downloaded via the Solcast API Toolkit.

Automated API requests are not available at this time.

Test now, free

Get free historical data credits when you sign up, so you can try our data for yourself. You can download data automatically within around 1 to 5 minutes of submitting your request.