GribStream

Live & Historical Weather Forecast API

Query the latest forecasts from NOAA, ECMWF, CWA, and AI systems as they become available, then use the same API to backtest against years of forecast history. GribStream lets your application ask for exactly the weather data it needs: coordinates, time ranges, calculated fields, condition filters, and CSV, JSON, or NDJSON output.

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Popular coverage NBM GFS HRRR RRFS GEFS IFS AIGFS

Latest forecasts available

Current forecasts Fresh forecast updates as they arrive

Forecast history Years of forecasts for backtesting

Application-ready Coordinates, filters, CSV, JSON, NDJSON

Built for fast, predictable forecast access

Three pillars that keep the data fast, the API simple, and the pricing predictable.

Fast at production scale

Fetch fresh forecasts or months of hourly history for tens of thousands of points in one HTTP request, in seconds.

API-first workflow

Simple API, open-source clients and clear documentation. Try it in minutes.

Predictable usage

Predictable pricing and high throughput. Query only the forecast data you need, when you need it.

Developer workflow

One request, exactly the forecast data you need

Pick a dataset, coordinates, variables, and time range. GribStream returns tidy rows for applications, ML pipelines, dashboards, and research notebooks.

Read Quick Start

POST /api/v2/gfs/timeseries JSON request

{
  "fromTime": "2025-05-01T00:00:00Z",
  "untilTime": "2025-05-02T00:00:00Z",
  "coordinates": [{ "lat": 40.758, "lon": -73.985 }],
  "variables": [{ "name": "TMP", "level": "2 m above ground", "info": "" }]
}

Latest by default Use current forecast cycles for production requests without changing endpoints.

Backtest by time Replay older forecast cycles against the same coordinates, variables, and output formats.

Shape the response Add expressions and filters when applications need derived values or condition search.

Platform capabilities

Query current and historical forecasts with advanced filtering, expressions, and ensembles.

Latest forecasts and history

Query current forecasts, then use the same API for multi-year forecast history and backtesting.

Flexible formats

Choose CSV, JSON, or NDJSON for streaming workflows.

Precise locations

Query any coordinates with flexible precision.

Time controls

Request ranges or explicit timestamps.

Best-run selection

Automatic selection of the best eligible run.

`asOf` model-run-time cutoff?

Restrict queries to model runs generated at or before a chosen model-run timestamp.

Derived fields

Compute derived fields on the fly.

Condition search

Filter by conditions instead of raw grids.

Ensemble support

Full ensemble members and statistics.

Expert support

Prompt, precise support from engineers who know the data.

Forecast coverage

Operational, regional, ensemble, analysis, and AI forecast systems exposed through one consistent API. Use this page for a quick scan, then open the full catalog for dataset-level details.

Open full catalog

4 active AI systems 14 NOAA families 6 ECMWF datasets 1 Taiwan regional model

AIGFS NOAA AI Global Forecast System Operational NOAA/NCEP AI deterministic global guidance from NOAA EAGLE. Sub-datasets

Surface Pressure Levels

AIGEFS NOAA AI Global Ensemble Forecast System Operational NOAA/NCEP AI ensemble guidance with member-level surface and pressure-level scenarios. Sub-datasets

Surface Pressure Levels

AIFS Oper ECMWF AI Forecasting System ECMWF machine-learning deterministic global guidance for fast medium-range workflows. Dataset

AIFS Oper

AIFS Ensemble ECMWF AIFS Ensemble ECMWF machine-learning ensemble guidance for probabilistic medium-range workflows. Dataset

AIFS Ensemble

NBM Family National Blend of Models Post-processed blend with multiple regional and oceanic grids. Sub-datasets

CONUS Alaska Hawaii Puerto Rico Guam Oceanic QMD

NBM Parallel Parallel v5 Experimental public parallel NBM feed serving NBM v5, exposed under separate dataset codes for side-by-side validation against operations. Only the last 5 days are retained. Sub-datasets

CONUS Alaska Hawaii Puerto Rico Guam Oceanic QMD

RTMA / URMA Analysis & Actuals Surface analyses with both hourly and 15-minute fast-update products. Sub-datasets

URMA RTMA (Hourly) RTMA Rapid Update (15m)

CCPA Precipitation Analysis One-hour climatologically calibrated precipitation analysis for CONUS verification, hydrology, and event review. Dataset

CCPA 1h NDGD 2.5 km

HRRR Family High-Resolution Rapid Refresh Storm-scale short-range guidance with hourly and sub-hourly variants. Sub-datasets

HRRR (Hourly) HRRR Sub-hourly (15m)

DAFS Domestic Aviation Forecast System Aviation-focused turbulence and in-flight icing guidance for CONUS and Alaska route-aware workflows. Sub-datasets

GTG Turbulence IFI CONUS IFI Alaska

SPC Post HREF Convective Probabilities Thunderstorm, lightning-density, hail, tornado, and severe-wind probability guidance for short-range CONUS severe-weather operations. Sub-datasets

Thunder 1h Thunder 4h Lightning 4h Hail 4h Tornado 4h Wind 4h

RRFS Family Rapid Refresh Forecast System Next-generation NOAA rapid-refresh guidance for CONUS upper-air, surface, and ensemble workflows. Sub-datasets

RRFS Pressure RRFS 2D Fields RRFS Ensemble

GEFS Family Global Ensemble Forecast System Atmospheric members, summary fields, chemistry, and marine probabilities. Sub-datasets

Atmospheric Members Atmospheric Mean Chem Wave Prob

CFS Family Climate Forecast System Seasonal components across atmosphere, surface fluxes, isentropic fields, ocean, and climate-assimilation context. Sub-datasets

Pressure Radiative Fluxes Isentropic Ocean CDAS1

GFS Core Global Forecast / Analysis Core global deterministic forecast and global analysis context. Sub-datasets

GFS GDAS

UVI Ultraviolet Index Forecast Global ultraviolet exposure guidance for public-health, recreation, tourism, and outdoor-work applications. Dataset

UVI

RAP Rapid Refresh Frequent-cycle regional short-range guidance for operational nowcasting workflows. Dataset

RAP

NAM North American Mesoscale Classic mesoscale family with upper-air, surface-rich, convection-allowing, and simulated-satellite CONUS slices. Sub-datasets

Upper Air Surface Diagnostics CONUS Nest GOES 218

IFS Family Integrated Forecasting System Deterministic, ensemble, and wave products for global decision support. Sub-datasets

Oper Ensemble Wave Wave Ensemble

AIFS Family AI Forecasting System ECMWF AI-based deterministic and ensemble global guidance. Sub-datasets

AIFS Oper AIFS Ensemble

CWA WRF Taiwan CWA WRF 15 km Regional mesoscale forecast for Taiwan, the South China Sea, the Philippine Sea, and western Pacific weather corridors. Dataset

WRF 15 km Regional

Pricing plans

A Free Plan is available to get you started. Upgrade to one of our Pro plans for higher daily usage limits.

For larger-scale usage, customized plans, heavy backfills, higher performance, or additional features, contact us.

Pro Plan

Daily Limit: 48,000 credits

$9.90 / month

Pro Plan 2x

Daily Limit: 96,000 credits

$18.80 / month

Pro Plan 4x

Daily Limit: 192,000 credits

$35.70 / month

Pro Plan 8x

Daily Limit: 384,000 credits

$67.80 / month

Pro Plan 16x

Daily Limit: 768,000 credits

$128.80 / month

Pro Plan 32x

Daily Limit: 1,536,000 credits

$244.70 / month

Per request quota calculation

Credits are calculated from what is actually returned.

Credits = returned_valid_times
  * parameters
  * ceil(coordinates / 500)

In words: valid times returned, times the number of weather parameters, times bundles of 500 coordinates.

We do not charge for times that are not returned, for example model-specific skipped horizons.

Examples

If your response returns 24 valid times, with 2 parameters, for 700 coordinates: 24 * 2 * 2 = 96 credits
If your response returns 100 valid times, with 1 parameter, for 3,500 coordinates: 100 * 1 * 7 = 700 credits

Cache hits are billed at 10 % of normal credits.

Ready to build

Start with a free API token

Create an account, run the Quick Start, or browse forecast coverage before wiring GribStream into your application.

Get free API token Quick Start Open catalog

GribStream Live & Historical Weather Forecast API