dataset · Global

ECMWF Open Data

Open real-time forecast subsets from ECMWF with documented dissemination access.

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Data offered docs-verified: IFS and AIFS real-time forecast subset (medium-range high-resolution and ensemble, seasonal) · 2 metre temperature · 10 metre and 100 metre wind components · Total precipitation · Total precipitation rate · Precipitation type · Pressure-level temperature, wind, humidity and geopotential · Soil temperature and volumetric soil water (layers 1-4) · Runoff · Total cloud cover · Mean sea level pressure · Significant wave height (period-banded and combined) and mean/peak wave period and direction · Sea ice thickness, sea surface height and sea water velocity · Tropical cyclone tracks (BUFR)
Coverage docs-verified: Global · Rolling archive of the most recent 12 forecast runs (approximately 2-3 days)
Resolution docs-verified: 0.25 degrees spatial (unless stated otherwise); forecast steps 3-hourly to 144 h, then 6-hourly to 360 h for 00z/12z runs
Update frequency docs-verified: Four runs daily (00, 06, 12, 18 UTC); IFS released at end of real-time dissemination schedule, AIFS released as soon as produced
Formats docs-verified: GRIB2 · BUFR
Access docs-verified: Free of charge, open access; CC-BY-4.0 licence plus ECMWF Terms of Use (commercial use permitted with attribution). Direct access limited to 500 simultaneous connections. Cloud copies on AWS, Azure and GCP. Service Charges may apply to direct or delivered access beyond the open subset. No API key or authentication is described in the docs.

Use cases llm-inferred: Forecast rainfall and temperature context for construction programme weather-risk reviews · Qualitative forecast precipitation and runoff context for flood-event briefings (not a substitute for design rainfall) · Wind and significant wave height forecast context for coastal and marine works planning · Forecast soil moisture and temperature as context for earthworks and ground-condition risk notes
Audience llm-inferred: hydrologists · flood consultants · coastal engineers · civils planners and programme managers · GIS analysts and data engineers

Constraints llm-inferred: 0.25 degree resolution only; higher-resolution products need a Real-time Dissemination Service Agreement · Rolling archive of 12 runs (about 2-3 days); full historical archive requires a service agreement · Limit of 500 simultaneous connections to the Open-Data Portal · Some parameters currently unavailable (t20d depth of 20C isotherm; sav300 average salinity), per the docs as of Aug 2026 · Stream names changed from 06z/18z scda/scwv to oper/wave from IFS Cycle 50r1; parameter lists may change · Not a design-rainfall dataset; forecasts only, no observed or historical series · Service Charges may apply to some access routes

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Metadata observed 14/10/2026 · editorial seed