{"uid":"cap_oxlb-txddbzgYkvwpjS7B","slug":"global-weather-nws-heat-index-calculator-93348379","name":"Global Weather – NWS Heat Index Calculator","description":"NWS heat index (feels-like in heat) from air temperature and relative humidity, in F and C, with the NWS risk category.","url":"https://weather-global.x402tookit.com/heat-index?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":["temp","humidity"],"properties":{"temp":{"type":"number","description":"Air temperature"},"unit":{"type":"string","description":"F (default) or C"},"humidity":{"type":"number","description":"Relative humidity percent, 0 to 100"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","properties":{"asOf":{"type":["null","string"]},"method":{"type":["null","string"]},"source":{"type":["null","string"]},"reasons":{"type":["array","null"],"items":{"type":"string"}},"summary":{"type":["null","string"]},"verdict":{"type":["null","string"]},"category":{"type":["null","string"]},"degraded":{"type":["boolean","null"]},"guidance":{"type":["null","string"]},"disclaimer":{"type":["null","string"]},"heatIndexC":{"type":["null","number"]},"heatIndexF":{"type":["null","number"]},"notChecked":{"type":["array","null"],"items":{"type":"string"}},"humidityPct":{"type":["null","number"]},"temperatureC":{"type":["null","number"]},"temperatureF":{"type":["null","number"]}}}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.02","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.02/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_CzMzHuZUOu3IQD7-ZMtzT","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.02","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Calculates the NWS heat index (feels-like temperature in hot conditions) from air temperature and relative humidity, returning values in both Fahrenheit and Celsius along with an NWS risk category.","exampleAgentPrompt":"What's the NWS heat index and risk category right now if it's 97°F outside with 85% relative humidity?","exampleUseCases":[{"title":"Outdoor worker heat safety check","prompt":"It's 102°F with 75% humidity on the job site — what's the NWS heat index and what risk category does that put workers in?"},{"title":"Heat advisory dashboard alert","prompt":"Calculate the heat index for 38°C and 65% relative humidity and tell me the NWS danger level so I can decide whether to issue a heat warning."},{"title":"Athletic event safety screening","prompt":"We're running a race this afternoon at 91°F and 88% humidity — what's the feels-like heat index in both Fahrenheit and Celsius and what does NWS say about the risk?"}],"resultDescription":"Returns the computed NWS heat index in both Fahrenheit and Celsius, the original input temperature in both units, the humidity percentage used, an NWS risk/danger category label, human-readable guidance, a summary, reasons, and a disclaimer about the calculation method.","failureModes":["Missing required 'temp' or 'humidity' query parameters returns an error","Humidity values outside 0–100 range may produce invalid or degraded results","NWS formula only applies at high temperature and humidity combinations; low conditions may return a degraded or not-applicable result","Invalid unit value (not F or C) may cause computation failure"],"whenToPreferThis":"Use this endpoint when you need the NWS-standard heat index calculation — the official US government formula for feels-like temperature in hot, humid conditions — including the official NWS risk classification (Caution, Extreme Caution, Danger, Extreme Danger). Prefer this over generic weather forecast endpoints when you need a precise, formula-based apparent temperature for safety assessments, health monitoring, or compliance with NWS heat advisory thresholds, without needing real-time location data.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-21T07:20:15.306Z","isFirstParty":false,"canonicalSlug":"global-weather-nws-heat-index-calculator-93348379"}