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Data accessibility

XML format via REST API

CSV format via SFTP or email

More information about Solargis Forecast API service

Data parameters

Solar radiation parameters

GHI Global horizontal irradiation kWh/m2, Wh/m2, W/m2
DNI Direct normal irradiation kWh/m2, Wh/m2, W/m2
DIF Diffuse Horizontal Irradiation kWh/m2, Wh/m2, W/m2
GTI_tracker Global Tilted Irradiation for tracker kWh/m2, Wh/m2, W/m2
GHI_UNC_HIGH GHI high estimate (10 % probability of exceedance)  kWh/m2, Wh/m2, W/m2
GHI_UNC_LOW GHI low estimate (90 % probability of exceedance)  kWh/m2, Wh/m2, W/m2
GTI_UNC_HIGH GTI high estimate (10 % probability of exceedance)  kWh/m2, Wh/m2, W/m2
GTI_UNC_LOW GTI low estimate (90 % probability of exceedance)  kWh/m2, Wh/m2, W/m2
GHI_C Clear-sky Global Horizontal Irradiation kWh/m2, Wh/m2, W/m2
DNI_C Clear-sky Direct Normal Irradiation kWh/m2, Wh/m2, W/m2
GTI_C Global tilted clear-sky irradiance W/m2
INC Incidence angle of direct irradiance °

Meteorological parameters

TEMP Air temperature at 2 meters °C
RH Relative humidity at 2 meters above ground %
TD  Dew point temperature °C 
WBT Wet bulb temperature °C 
WS Wind speed m/s at 10 meters above ground m/s
WD Wind direction m/s at 10 meters above ground °
WG Wind gusts at 10 meters above ground m/s
AP Atmospheric pressure hPa
PREC Precipitation (rainfall) mm
SDWE Water equivalent of accumulated snow depth kg/m2
WS100 Wind speed at 100 m m/s
WD100 Wind direction at 100 m °
SFWE Water equivalent of fresh snowfall rate kg/m2/hour

Environmental parameters

PWAT Precipitable water kg/m2

PV parameters

PVOUT Specific photovoltaic power output kWh
PVOUT_UNC_HIGH PVOUT high estimate (10 % probability of exceedance) kW, kWh
PVOUT_UNC_LOW PVOUT low estimate (90 % probability of exceedance) kW, kWh
TMOD Module temperature °C 

Other data

SE Sun elevation °
SA Sun azimuth °
KC Clear-sky index  
KT Clearness index  
PAR Photo-synthetically Active Irradiation kWh/m2, Wh/m2, W/m2

Forecast range and frequency

Time range

Up to 14 days ahead

Frequency of the updates Forecasts based on

2 to 4 times per day

Numerical Weather Prediction models

every 5, 10, or 15 minutes

Cloud Motion Vector model

In other words, a revised forecast is available every 5/10/15 minutes for next hours, and a revised forecast for next day is typically available every 6-12 hours

Geographical and temporal coverage

Solargis FORECAST NOWCAST NWP data coverage map v202501