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Look up current conditions for any city using Open-Meteo, a free public weather API that needs no key and no account. This is the one tool on the site that makes a network request.
Search any city for real-time weather, 7-day forecast, air quality, UV index, sunrise/sunset, and more. Powered by the free Open-Meteo API (no API key, no tracking). Your city query and resolved coordinates are sent to open-meteo.com to fetch the forecast.
Stated plainly: this is the single tool here that talks to a server. Your city query and the coordinates it resolves to are sent to Open-Meteo. The other 89 tools run entirely in your browser and send nothing anywhere.
Open-Meteo is the notable option among weather APIs for requiring no API key at all for non-commercial use, which makes it the easiest way to add weather to a side project without a signup flow and a secret to manage. It aggregates national meteorological services rather than running its own model.