NWS Hourly Forecast (Hour-by-Hour Forecast for a Forecast Grid Cell)

nws/grid-forecast-hourly

The National Weather Service's hour-by-hour forecast for one forecast grid cell: about 156 hourly periods, each with temperature, chance of precipitation, dewpoint, relative humidity, wind and a short summary. Get the office id and grid cell for a coordinate from NWS Grid Point first. US only: it covers the United States and its territories, and an office or cell NWS does not know returns an error. National Weather Service data as served by Omnial, not an official NWS product.

activeper callv1

Price

$0.00273 per call

You pay the price shown. If a call turns out to cost more than its quote, you pay the actual price, capped at twice the quote. No monthly minimum. Top-ups start at $5.

Data source

National Weather Service

Data from the U.S. National Weather Service (NOAA), public domain per weather.gov/disclaimer. Served by Omnial; not an official NWS product and not endorsed by NOAA or NWS.

Use it

Five steps: search, inspect, learn, run, settle. No per-tool setup; your agent reaches this tool through the meta-tools it already has.

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agent

// 1. search: find the tool
omnial_search({ query: "what you need" })

// 2. inspect: price and input schema
omnial_inspect({ tool: "nws/grid-forecast-hourly" })

// 3. learn: read the usage guide at runtime
omnial_learn({ tool: "nws/grid-forecast-hourly" })

// 4. run: price the exact call first, then run it
omnial_execute({ tool: "nws/grid-forecast-hourly", input: { /* see input_schema */ }, dry_run: true })
omnial_execute({ tool: "nws/grid-forecast-hourly", input: { /* ... */ } })

// 5. settle: the call is charged when it finishes, nothing to do

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Pricing

Every charge this tool can incur.

Charge	Price
Per call	$0.00273

Updated: Oct 18, 2026

Input and output schemas

Input schema

input_schema.json

{
  "type": "object",
  "required": [
    "office",
    "grid_x",
    "grid_y"
  ],
  "properties": {
    "units": {
      "enum": [
        "us",
        "si"
      ],
      "type": "string",
      "default": "us",
      "description": "us for Fahrenheit and miles per hour (the default); si for Celsius and kilometres per hour."
    },
    "grid_x": {
      "type": "integer",
      "maximum": 999,
      "minimum": 0,
      "description": "Forecast grid column, the gridX from NWS Grid Point."
    },
    "grid_y": {
      "type": "integer",
      "maximum": 999,
      "minimum": 0,
      "description": "Forecast grid row, the gridY from NWS Grid Point."
    },
    "office": {
      "type": "string",
      "pattern": "^[A-Z]{3}$",
      "description": "Three-letter NWS forecast office id, the gridId from NWS Grid Point (for example LWX)."
    }
  },
  "additionalProperties": false
}

Output schema

output_schema.json

{
  "type": "object",
  "required": [
    "periods",
    "updateTime"
  ],
  "properties": {
    "units": {
      "type": "string",
      "description": "The unit system the periods use, us or si."
    },
    "periods": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "name": {
            "type": "string",
            "description": "Always empty on hourly periods."
          },
          "number": {
            "type": "integer",
            "description": "Position in the sequence, starting at 1."
          },
          "endTime": {
            "type": "string",
            "description": "Hour end, ISO 8601 with local offset."
          },
          "dewpoint": {
            "type": "object",
            "description": "Dewpoint as a value with its unitCode (degrees Celsius)."
          },
          "isDaytime": {
            "type": "boolean"
          },
          "startTime": {
            "type": "string",
            "description": "Hour start, ISO 8601 with local offset."
          },
          "windSpeed": {
            "type": "string",
            "description": "Wind speed text such as 8 mph."
          },
          "temperature": {
            "type": "number",
            "description": "Temperature in the unit given by temperatureUnit."
          },
          "shortForecast": {
            "type": "string",
            "description": "One-line summary."
          },
          "windDirection": {
            "type": "string"
          },
          "temperatureUnit": {
            "type": "string",
            "description": "F or C."
          },
          "detailedForecast": {
            "type": "string",
            "description": "Always empty on hourly periods."
          },
          "relativeHumidity": {
            "type": "object",
            "description": "Relative humidity as a percent value."
          },
          "probabilityOfPrecipitation": {
            "type": "object",
            "description": "Chance of precipitation as a percent value."
          }
        },
        "additionalProperties": true
      },
      "description": "One-hour forecast periods in time order, the first being the current or next hour."
    },
    "elevation": {
      "type": "object",
      "description": "Elevation of the grid cell."
    },
    "updateTime": {
      "type": "string",
      "description": "When the forecast data was last updated, ISO 8601."
    },
    "validTimes": {
      "type": "string",
      "description": "The interval the forecast is valid for."
    },
    "generatedAt": {
      "type": "string",
      "description": "When NWS generated this forecast, ISO 8601."
    }
  },
  "description": "The NWS hourly forecast for the grid cell.",
  "additionalProperties": true
}