NOAA — National Oceanic and Atmospheric Administration · Rate Limits

Noaa Gov Rate Limits

Name: Noaa Gov Rate Limits
Creator: NOAA — National Oceanic and Atmospheric Administration
Keywords: Weather, Climate, Ocean, Space Weather, Government, Open Data, Forecast, Marine, Atmospheric, Hydrology, Satellite, Fisheries, Aviation, Emergency Management

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.