Weather Station Data for Kalshi & Polymarket Traders

Live and historical data from official US weather stations: the high and low so far today, every METAR observation, and the official NWS daily climate reports. Built for weather-market traders, but it works for any US station.

Enter a station id or a Kalshi temperature series (e.g. KXHIGHNY, KXLOWTCHI), and the Actor looks up which station that market references (for example New York → Central Park KNYC, Chicago → Midway KMDW) and returns its data. No login, no API keys.

What you get

Today so far (today), one record per station:

• High and low so far for the current NWS climate day, which runs midnight to midnight local standard time even during daylight saving time (a common source of mistakes)
• Current temperature, time of the high and low, number of observations
• The latest NWS daily climate report for today, with its issue time and a preliminary flag when it was issued before the day ended

Observations (observations): every hourly METAR and special SPECI report with temperature (°F/°C), dewpoint, wind, gusts, visibility, pressure, flight category and the raw METAR. Up to 360 hours back, or any date range going back decades.

Daily climate reports (dailyClimate): the official NWS CLI daily high and low (with times), normals, records, precipitation and snow for any date range.

Example: "today" record

{
  "type": "today",
  "station": "KNYC",
  "stationName": "New York City, Central Park",
  "kalshiSeries": "KXHIGHNY",
  "climateDate": "2026-09-23",
  "currentTempF": 66,
  "highSoFarF": 66,
  "highSoFarTimeLocal": "2026-09-23T13:51:00",
  "lowSoFarF": 55,
  "nwsClimateReportHighF": 67,
  "nwsClimateReportPreliminary": true
}

Use cases

• Track the running daily high and low for weather-market positions on a schedule (every 5–15 minutes)
• Backtest temperature strategies with years of official daily highs and lows
• Check how hourly METAR readings compare with the official daily value
• Aviation, agriculture, energy and research pipelines that need clean station data

Important

• Kalshi's US temperature markets currently resolve according to The Weather Company for the NWS station named in the rules. This Actor gives you the underlying official NWS station data, which is what that value is measured from, but it is not the settlement source itself. Always check the market rules.
• The high and low so far come from hourly and special METAR reports. The official daily value uses 1-minute data and can differ by a degree or so.
• US stations only. International markets (Seoul, London…) are not covered.

Data sources

Official public-domain data from the National Weather Service (api.weather.gov), the NOAA Aviation Weather Center (aviationweather.gov), and the Iowa Environmental Mesonet ASOS/CLI archive. Market-to-station mapping comes from Kalshi's public market rules.

Pricing

Pay per record, and nothing for failed stations. Schedule it as often as you like and set a maximum cost per run.

Questions or a station that doesn't work? Open an issue. Issues are answered within 24 hours.