If you enter a query with the word weather and a city or location name, if Google recognizes the location, the forecast will appear at the top of the results page. Otherwise, your results will usually include links to sites with the weather conditions and forecast for that location.

Since weather is not an advanced operator, there is no need to include a colon after the word. For example, [ weather: Delhi, India ] will return the weather for Delhi, India and [ weather: 94041 ] will return the weather for the city containing the zip code (US postal code) 94041, which is Mountain View, California.