Solar Solar Radiation Data

Forecast and current solar irradiance and weather data with global coverage and real-time accuracy reporting

Solar radiation forecast and actuals data, worldwide

Based on our proprietary cloud and aerosol tracking and forecasting. Updated every 5-15 minutes, with forecasts extending 7 days ahead. Available at 5, 10, 15 or 30 minute time granularity.


Our customers use our live and forecast solar radiation and weather data to:

  • Monitor and analyse PV production performance

  • Create or improve in-house solar power forecasting

  • Forecast for concentrated solar thermal (CST) generators


Data Specifications


  • Global Horizontal Irradiance (GHI)
  • Direct Normal Irradiance (DNI)
  • Diffuse Horizontal Irradiance (DIF, DHI)
  • Cloud Opacity
  • Temperature
  • Solar zenith angle
  • Solar azimuth angle

Forecast probabilities:

Additional percentile forecasts (10th and 90th) provided for:

  • Global Horizontal Irradiance (GHI)
  • Direct Normal Irradiance (DNI)

Spatial coverage

All continents (Rapid update actuals and forecast data)

Global (forecasts)

Time granularity

Utility Scale Sites: 5, 10, 15, 20 or 30 minutes (Solar Radiation data is included with Utility Scale Solar Forecasts

Solar Radiation Sites or via Simple Lat / Lon requests: 30 minutes (period mean)

Update frequency

Every 10 or 15 minutes

Time span (Forecast)

Present time to +7 days ahead

Time span (Live)

7 days ago to present time

Time span (Recent)

3 months ago to 2 days ago

API call options

Your choice of either:

  • Lat/lon based Simple Radiation Requests (allows greater flexibility)
  • Creation of weather site (greatest accuracy for the specific point)

Test now, for your site, free

Access solar radiation data via API (including CSV download) and begin your free trial in less than one minute!