When to use forecast in Korean
Korean: 예상[ ye-sang ]

When to use it
Forecast (예상) means a prediction about future weather. It tells us what the weather will probably be like, such as rain, sun, wind, or temperature. You can use this word when talking about weather reports or plans for later today or tomorrow.
Example sentences
오늘 오후에는 비가 예상돼요.
Rain is forecast for this afternoon.
내일 아침에는 추운 날씨가 예상돼요.
Cold weather is forecast for tomorrow morning.
학교 소풍 날에는 맑은 날씨가 예상돼요.
Sunny weather is forecast for the school picnic day.
해변에는 강한 바람이 예상돼요.
Strong wind is forecast at the beach.
비가 예상돼서 우산을 샀어요.
Rain was forecast, so I bought an umbrella.
제주도는 주말에 맑을 것으로 예상돼요.
Jeju Island is forecast to be clear this weekend.