The air temperature at a location—the outside temperature usually reported in weather forecasts.
今日の最高気温は30度の予想です。
Today's expected high temperature is 30°C.
朝は気温が低いので上着が必要だ。
It's cold in the morning, so you'll need a jacket.
一日の気温差が大きいので体調管理に注意してください。
Because the temperature difference during the day is large, take care of your health.