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WEATHER API / V1
Weather forecasts
without needless complexity.
Get point parameters and hourly series. Time is UTC; values and units come directly in the response.
QUICK START
Three steps to your first forecast
Check the period
Request metadata to see available dates, coverage, and parameters.
Request a series
Send coordinates, exact times from metadata, and the required parameter codes.
PowerShell
$headers = @{ Authorization = "ApiKey eol_your_key" }
Invoke-RestMethod -Headers $headers `
-Uri "https://weatherapi.projecteol.ru/api/v1/metadata/"AVAILABLE DATA
Current forecast parameters
Live fields from the published dataset are grouped by meteorological purpose. Send a code in the parameters query argument; separate multiple codes with commas.
Dataset4e22387d5298c70cfdf393cf
Period2026-10-05T12:00:00Z — 2026-10-15T12:00:00Z
Sourcenoaa-gfs / gfs
Wind
Wind speed, direction, gusts, and vector components.
| Request code | Meaning | Unit | Layer |
|---|---|---|---|
height_100m.eastward_wind_100m |
100 metre eastward wind | m s-1 | Height 100 m |
height_100m.northward_wind_100m |
100 metre northward wind | m s-1 | Height 100 m |
height_80m.eastward_wind_80m |
80 metre eastward wind | m s-1 | Height 80 m |
height_80m.northward_wind_80m |
80 metre northward wind | m s-1 | Height 80 m |
surface.eastward_wind_10m |
10 metre eastward wind | m s-1 | Surface and near-surface layer |
surface.friction_velocity |
Surface friction velocity | m s-1 | Surface and near-surface layer |
surface.northward_wind_10m |
10 metre northward wind | m s-1 | Surface and near-surface layer |
surface.wind_speed_of_gust |
Surface wind speed of gust | m s-1 | Surface and near-surface layer |
wind_direction_100mcomputed by API |
100 m wind direction | degree | Derived parameter |
wind_direction_10mcomputed by API |
10 m wind direction | degree | Derived parameter |
wind_direction_80mcomputed by API |
80 m wind direction | degree | Derived parameter |
wind_speed_100mcomputed by API |
100 m wind speed | m s-1 | Derived parameter |
wind_speed_10mcomputed by API |
10 m wind speed | m s-1 | Derived parameter |
wind_speed_80mcomputed by API |
80 m wind speed | m s-1 | Derived parameter |
Temperature and pressure
Air temperature and atmospheric pressure at the surface and aloft.
| Request code | Meaning | Unit | Layer |
|---|---|---|---|
height_100m.air_temperature_100m |
100 metre air temperature | K | Height 100 m |
height_80m.air_pressure_80m |
80 metre air pressure | Pa | Height 80 m |
height_80m.air_temperature_80m |
80 metre air temperature | K | Height 80 m |
surface.air_pressure_at_mean_sea_level |
Mean sea-level pressure | Pa | Surface and near-surface layer |
surface.air_temperature_2m |
2 metre air temperature | K | Surface and near-surface layer |
surface.dew_point_temperature_2m |
2 metre dew-point temperature | K | Surface and near-surface layer |
surface.surface_air_pressure |
Surface air pressure | Pa | Surface and near-surface layer |
Humidity, clouds, and precipitation
Water in the air, cloud cover, precipitation, and visibility.
| Request code | Meaning | Unit | Layer |
|---|---|---|---|
atmosphere.atmosphere_mass_content_of_water_vapor |
Total atmospheric precipitable water | kg m-2 | Atmosphere |
atmosphere.high_cloud_area_fraction |
High cloud area fraction | 1 | Atmosphere |
atmosphere.low_cloud_area_fraction |
Low cloud area fraction | 1 | Atmosphere |
atmosphere.medium_cloud_area_fraction |
Middle cloud area fraction | 1 | Atmosphere |
height_80m.specific_humidity_80m |
80 metre specific humidity | kg kg-1 | Height 80 m |
surface.cloud_area_fraction |
Total cloud area fraction | 1 | Surface and near-surface layer |
surface.precipitation_amount |
Accumulated precipitation amount | kg m-2 | Surface and near-surface layer |
surface.precipitation_flux |
Instantaneous surface precipitation rate | kg m-2 s-1 | Surface and near-surface layer |
surface.relative_humidity_2m |
2 metre relative humidity | % | Surface and near-surface layer |
surface.snow_water_equivalent |
Water equivalent of accumulated snow depth | kg m-2 | Surface and near-surface layer |
surface.surface_snow_thickness |
Surface snow depth | m | Surface and near-surface layer |
surface.visibility_in_air |
Horizontal visibility | m | Surface and near-surface layer |
Solar radiation and ultraviolet
Shortwave and longwave fluxes, albedo, and UV indicators.
| Request code | Meaning | Unit | Layer |
|---|---|---|---|
surface.surface_albedo |
Time-mean forecast surface albedo | 1 | Surface and near-surface layer |
surface.surface_downwelling_longwave_flux_in_air |
Surface downwelling longwave radiation flux | W m-2 | Surface and near-surface layer |
surface.surface_downwelling_shortwave_flux_in_air |
Surface downwelling shortwave radiation | W m-2 | Surface and near-surface layer |
surface.surface_upwelling_shortwave_flux_in_air |
Surface upwelling shortwave radiation flux | W m-2 | Surface and near-surface layer |
Other model parameters
Specialized diagnostic fields and new dataset parameters.
| Request code | Meaning | Unit | Layer |
|---|---|---|---|
atmosphere.atmosphere_boundary_layer_thickness |
Planetary boundary-layer height | m | Atmosphere |
surface.surface_altitude |
Surface altitude | m | Surface and near-surface layer |
surface.surface_roughness_length |
Forecast surface roughness length | m | Surface and near-surface layer |
Short code aliases (34)
These are the same data as the primary fields above. Use the full group-qualified code in integrations.
air_pressure_80m → height_80m.air_pressure_80mair_pressure_at_mean_sea_level → surface.air_pressure_at_mean_sea_levelair_temperature_100m → height_100m.air_temperature_100mair_temperature_2m → surface.air_temperature_2mair_temperature_80m → height_80m.air_temperature_80matmosphere_boundary_layer_thickness → atmosphere.atmosphere_boundary_layer_thicknessatmosphere_mass_content_of_water_vapor → atmosphere.atmosphere_mass_content_of_water_vaporcloud_area_fraction → surface.cloud_area_fractiondew_point_temperature_2m → surface.dew_point_temperature_2meastward_wind_100m → height_100m.eastward_wind_100meastward_wind_10m → surface.eastward_wind_10meastward_wind_80m → height_80m.eastward_wind_80mfriction_velocity → surface.friction_velocityhigh_cloud_area_fraction → atmosphere.high_cloud_area_fractionlow_cloud_area_fraction → atmosphere.low_cloud_area_fractionmedium_cloud_area_fraction → atmosphere.medium_cloud_area_fractionnorthward_wind_100m → height_100m.northward_wind_100mnorthward_wind_10m → surface.northward_wind_10mnorthward_wind_80m → height_80m.northward_wind_80mprecipitation_amount → surface.precipitation_amountprecipitation_flux → surface.precipitation_fluxrelative_humidity_2m → surface.relative_humidity_2msnow_water_equivalent → surface.snow_water_equivalentspecific_humidity_80m → height_80m.specific_humidity_80msurface_air_pressure → surface.surface_air_pressuresurface_albedo → surface.surface_albedosurface_altitude → surface.surface_altitudesurface_downwelling_longwave_flux_in_air → surface.surface_downwelling_longwave_flux_in_airsurface_downwelling_shortwave_flux_in_air → surface.surface_downwelling_shortwave_flux_in_airsurface_roughness_length → surface.surface_roughness_lengthsurface_snow_thickness → surface.surface_snow_thicknesssurface_upwelling_shortwave_flux_in_air → surface.surface_upwelling_shortwave_flux_in_airvisibility_in_air → surface.visibility_in_airwind_speed_of_gust → surface.wind_speed_of_gustIMPORTANT
A few simple rules
Always UTC
Use time with Z, for example 2026-08-03T00:00:00Z.
Time must be available
For an exact forecast, use times from the current dataset: the API does not invent intermediate timestamps.
Do not guess units
The unit is returned with every value and shown in the table above.
Need endpoints, query parameters, and response examples?
Open the extended reference or interactive OpenAPI documentation.
DATA TECHNOLOGY
An open forecast data pipeline
ProjectEOL Weather API reads only a ready published dataset: source forecasts are downloaded, validated, and converted into immutable Zarr v3 storage before they appear in the API.
forecast-ingest ↗
Downloads and validates source forecast files in GRIB2.
forecast-zarr-processor ↗
Converts the validated forecast into immutable Zarr v3 storage and validates it before publication.
ProjectEOL Weather API
Safely opens only the verified published dataset and serves point data and time series.