NOAA — National Oceanic and Atmospheric Administration · Rate Limits

Noaa Gov Rate Limits

Documented rate-limit policies across NOAA's public API surface. Most NOAA endpoints are free and do not require an API key, but many publish soft rate limits to protect shared infrastructure. NCEI's legacy CDO v2 API is the only NOAA surface that issues per-token quotas; the rest enforce per-IP throttling that resets quickly.

Noaa Gov Rate Limits is the machine-readable rate-limit profile for NOAA — National Oceanic and Atmospheric Administration on the APIs.io network, conforming to the API Commons Rate Limits specification.

The profile also includes 6 backoff/retry policies defined.

Tagged areas include Weather, Climate, Ocean, Space Weather, and Government.

0 Limits
WeatherClimateOceanSpace WeatherGovernmentOpen DataForecastMarineAtmosphericHydrologySatelliteFisheriesAviationEmergency Management

Policies

National Weather Service API
api.weather.gov enforces undisclosed rate limits "to prevent abuse and help ensure that everyone has access." Throttled requests typically clear within 5 seconds. Clients must supply a unique, identifying User-Agent string with contact information so the NWS can reach operators of misbehaving clients.
NCEI Climate Data Online v2
CDO v2 issues a free API token via ncei.noaa.gov/cdo-web/token. Each token is limited to five requests per second and 10,000 requests per day. The token is supplied in the `token` HTTP header on every request.
NCEI Access Data Service v1
The modern NCEI Access Data Service does not require a token and does not publish a hard quota; operational throttling protects bulk requests. Pull large historical archives from NODD on AWS / GCP / Azure for unrestricted access.
CO-OPS Tides & Currents APIs
CO-OPS Data, Metadata, and Derived-Product APIs are free and unauthenticated. CO-OPS caps per-request payload sizes — 1-minute interval data limited to 4 days, hourly data to 1 year, monthly means to 200 years — and applies operational throttling at the edge.
NOAA Open Data Dissemination
NODD datasets are served directly from public S3, GCS, and Azure Blob buckets without authentication. Rate limits and throttling are enforced by the underlying cloud provider; effectively unlimited for typical workloads.
SWPC Data Service
services.swpc.noaa.gov serves static JSON, text, and image files updated on cadence (1 minute to daily). No published rate limit; clients should cache responses and respect refresh intervals to avoid edge throttling.

Work with this as data

Every rate limit here is available over the APIs.io API and to AI agents over MCP.

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Tools for rate limits

4 MCP tools reach this
  • find_rate_limitsBrowse and filter every rate limit in the catalog.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools →

Call it yourself

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This rate limit 
curl "https://apis.io/api/v1/rate-limits/noaa-gov-rate-limits"
All rate limits 
curl "https://apis.io/api/v1/rate-limits?limit=25"

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