GribStream
Live Forecasts & Historical Weather Actuals API
Query global and regional forecasts, ensembles, satellite and radar data, land-surface hydrology, atmospheric composition, and reanalysis actuals as they become available, then use the same API for 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.
Latest forecasts available
Current forecasts
Fresh forecast updates as they arrive
History & actuals
Forecast archives plus analysis and reanalysis actuals
Application-ready
Coordinates, filters, CSV, JSON, NDJSON
Built for fast, predictable weather-data access
Three pillars that keep the data fast, the API simple, and the pricing predictable.
Fast at production scale
Fetch fresh forecasts, reanalysis actuals, 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 weather fields you need, when you need them.
Developer workflow
One request, exactly the weather data you need
Pick a dataset, coordinates, variables, and time range. GribStream returns tidy rows for applications, ML pipelines, dashboards, and research notebooks.
{
"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": "" }]
}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.
Forecasts, observations & weather actuals
Explore a focused cross-section of the catalog: live forecasts, ensemble predictions, observations, radar and weather analyses, reanalysis actuals, hydrology, and atmospheric composition. Open the full catalog for all dataset-level details.
89 datasets in the full catalog
Global and regional domains
Forecasts and ensembles
Actuals and observations
Coverage
Global forecasts & ensembles
Deterministic forecasts, ensembles, seasonal products, waves, and analysis guidance across global domains.
Coverage
Regional forecasts & severe weather
High-resolution and blended guidance for Europe, North America, and the western Pacific, including severe-weather probabilities.
Coverage
Observations, analyses & actuals
Satellite and radar observations, rapidly updated analyses, and reanalysis weather actuals for monitoring, verification, and historical workflows.
Coverage
AI & research
Operational and experimental AI weather forecasts, deterministic and ensemble guidance, and research reforecasts.
Coverage
Environmental & specialized data
Hydrologic forecasts, atmospheric composition, air quality, aviation turbulence, and icing for focused operational workflows.
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.