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National Weather Service API

Access official U.S. weather forecasts, observations and alerts for weather-market research.

4.0/ 5Editorial rating0 user reviews
Open documentationwww.weather.gov
Available on
API
Pricing
The official API documentation states that access is free, subject to reasonable unpublished rate limits.
Availability: public · A descriptive User-Agent is required. Follow the current documentation for authentication and content negotiation.

Screenshots and interface

Product preview1 / 1

Official National Weather Service API documentation with access and specification sections.

What is National Weather Service API?

The National Weather Service API exposes forecasts, observations and alerts through documented machine-readable endpoints. It is an external research input for U.S. weather questions, not a prediction-market trading service.

The distinction between forecast and observation is crucial. A daily maximum contract may depend on a named station, local reporting day and specific settlement publication, which a nearby forecast grid does not automatically reproduce.

Who it is for

  • Developers building U.S. weather research tools
  • Researchers checking forecasts against observations

Features and coverage

Available on
API
  • Weather endpoints

    Retrieve documented forecast, alert and observation data.

  • Machine-readable formats

    Use GeoJSON and other documented representations.

  • Operational guidance

    Read caching, rate-limit, feature-flag and outage information.

Workflows with National Weather Service API

Build a location feed

Follow the official examples to map the intended location to the appropriate forecast or station data.

Check settlement relevance

Compare station, unit and reporting period with the contract’s specified source before interpreting a reading.

Pricing and total cost

The official API documentation states that access is free, subject to reasonable unpublished rate limits.

Access: A descriptive User-Agent is required. Follow the current documentation for authentication and content negotiation.

Getting started

  1. Read the official API examples and specification.
  2. Identify the required location, station and data type.
  3. Use the documented headers and caching behaviour, then validate timestamps and units.

Useful links

    What to check

    • The API’s forecast is not a final observed settlement value. Geographic coverage, station choice, missing observations and update timing matter.

    A closer look

    Ratings & reviews

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    Editorial rating
    4.0/ 5
    0 user reviews
    Polytoolhub editorial

    Our take on National Weather Service API

    An authoritative, well-documented U.S. weather input. Its relevance to a particular contract depends on selecting the correct station, measure and reporting window.

    Based on documented features, setup and access terms. How we rate

    User reviews 0

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    Frequently asked questions about National Weather Service API

    Is an hourly forecast the same as the final daily maximum?

    No. A forecast is an estimate; the contract may require a specific observed station statistic.

    Does the API charge per request?

    The official documentation describes free access with rate limits rather than a per-request price.

    What does National Weather Service API cost?

    The official API documentation states that access is free, subject to reasonable unpublished rate limits.

    What access does National Weather Service API require?

    A descriptive User-Agent is required. Follow the current documentation for authentication and content negotiation.