This paper analyzes the current weather forecast in most countries on the defects and deficiencies of temperature forecasts. In addition, weather temperature and weather heat capacity were systematically analyzed in this paper. For this reason, the paper put forward a suggestion for the weather heat capacity (^oCh) to be added in weather forecast. If the weather forecast augments the unit (^oCh), the weather forecast would upgrade from one-dimensional to two-dimensional, and would make the temperature forecast more scientific, more reasonable and more accurately, which can serve the people and make economic construction better than before.