Retrieve individual ensemble member forecasts for a location from Open-Meteo's Ensemble API
domain: ensemble-api.open-meteo.com · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Call GET https://ensemble-api.open-meteo.com/v1/ensemble with latitude, longitude, and a list of hourly variables.
Select an ensemble model source (e.g. NOAA GEFS, DWD ICON-EPS, ECMWF IFS-ENS) via the models parameter.
Parse the response, which returns a separate time series per ensemble member (memberXX suffixes) for up to several days depending on model.
Aggregate members client-side (mean, spread, percentiles), or use the separate Ensemble Mean API if only summary statistics are needed.
Track API call cost — ensemble requests are weighted more heavily (multiple 'call units') than standard forecast calls under Open-Meteo's usage limits.
Known gotchas
Each ensemble member is a distinct array in the response — code that expects a single hourly series per variable will break.
Different model sources have different member counts, forecast lengths, and update cadences; mixing models in one request needs to account for these differences.
The non-commercial free tier has call-volume limits; heavy ensemble use (weighted several times per call) can exhaust quota faster than expected.
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