天气预报说明天要下雨用英语怎么说

"The weather forecast says it's going to rain tomorrow" 是说明天要下雨的英文表达方式。

其中 "weather forecast" 是指预报天气的意思，来自英语单词 "weather"（天气）和 "forecast"（预报）。

一些英文例句及其中文翻译如下：

"I heard on the news that the weather forecast is calling for rain tomorrow."
我听新闻说明天天气预报说要下雨。

"I checked the weather forecast and it looks like it's going to be a rainy day tomorrow."
我查了天气预报，看起来明天将会是个下雨的一天。

"I hope the weather forecast is wrong and it doesn't rain tomorrow."
我希望天气预报是错的，明天不下雨。