Open-Meteo vs wttr.in

Open-Meteo is an open-source weather API that blends forecast and historical data from national weather services like NOAA, DWD, and Meteo-France, automatically selecting the highest-resolution model available for a given location. It requires no API key for non-commercial use and covers specialized domains including marine conditions, air quality, flood risk, and long-range climate projections.

wttr.in returns weather reports as ASCII art directly to curl, wget, or a plain browser request, so there's no client UI to build. It's a standalone open-source Go service with plain-text, colorized ANSI, PNG, and JSON output modes, and needs no signup or API key.