About
Every free weather forecast. One call.
What it is
groundhog.markets is a free weather forecast site and API: the median daily high and low from every open forecast (NOAA, ECMWF, MET Norway, DWD, ECCC, SMN), with spread, rain, the latest observation and alerts, for 805 places in 242 countries and territories, rebuilt every 30 minutes and served by REST or MCP with no key.
Agents get the same numbers in one REST or MCP call. For agents →
Use
Free for any use, commercial and trading included, within the rate limit; reuse of the numbers follows each source's licence. Credits
Sources
Open data from national weather services and ECMWF, fetched on their own schedules and credited in every answer. Sources · Credits · Status
No warranty
Forecasts can be wrong. groundhog.markets is provided as is, with no warranty of accuracy, completeness or availability.
It is not an official warning service and not a market’s settlement value. For safety, follow your national weather service. Not affiliated with Kalshi or Polymarket.