weather-util fetches and formats current conditions from METAR data (the format used at airports and weather stations worldwide) for a given station code.

sudo apt-get install weather-util          # package availability varies by distribution

weather -iCYYT
# Current conditions at St. John's, Nfld (CYYT)
# Last updated ... EDT / ... UTC
#   Temperature: 8 F (-13 C)
#   Relative Humidity: 53%
#   Wind: from the W (270 degrees) at 14 MPH (12 KT)
#   Sky conditions: overcast

Station codes are ICAO identifiers (four letters; find yours at aviationweather.gov or a METAR station list). weather -m gives metric units. Since it depends on an internet METAR feed rather than a full forecast service, it reports current airport-observed conditions, not a multi-day forecast — for that, a proper weather API or website is needed.