Wet-bulb globe temp API

Estimates outdoor-in-sun wet-bulb globe temperature from temperature, humidity, wind and solar radiation using Stull's natural wet-bulb plus a solar globe term, returning the work/rest heat-stress flag. Answers 'What is the WBGT for these conditions?', 'Is it safe to exercise outside?'.

Price$0.06per request

MethodPOST

Route/v1/climate/wbgt

StatusLive

MIME typeapplication/json

Rate limit120/minute

Cache0s public

wbgtwet-bulb-globeheat-stressstullsolarthermal-comfortoccupationalweather

API URLhttps://x402.hexl.dev/v1/climate/wbgt

Integration docs

Example request

{
  "tempC": 32,
  "relativeHumidity": 60,
  "windSpeedMs": 2,
  "solarRadiation": 800
}

Example response

{
  "wbgtC": 27.82,
  "naturalWetBulbC": 25.79,
  "globeTempC": 32.85,
  "tempC": 32,
  "flagCategory": "green (moderate)",
  "interpretation": "WBGT 27.8°C — heat-stress flag: green (moderate).",
  "formula": "WBGT = 0.7·Tnwb + 0.2·Tg + 0.1·Ta (outdoor in sun); Stull NWB + solar globe approx"
}

Input schema

{
  "type": "object",
  "required": [
    "tempC",
    "relativeHumidity"
  ],
  "properties": {
    "tempC": {
      "type": "number",
      "description": "Air temperature in Celsius",
      "examples": [
        32
      ]
    },
    "relativeHumidity": {
      "type": "number",
      "description": "Relative humidity in percent (0-100)",
      "examples": [
        60
      ]
    },
    "windSpeedMs": {
      "type": "number",
      "description": "Wind speed in m/s (default 1)",
      "examples": [
        2
      ]
    },
    "solarRadiation": {
      "type": "number",
      "description": "Solar radiation in W/m2 (default 0)",
      "examples": [
        800
      ]
    }
  }
}

Output schema

{
  "type": "object",
  "additionalProperties": true
}