明天是阴天。

Tomorrow will be overcast.

《新英汉大辞典》

明天可能是阴天。

It'll probably be cloudy tomorrow.

youdao

我是今天的播音员，下面由我来为打家拨报今明两天的天气情况，今天南昌晴天16至26度，明天南昌阴天17至30度。

I am the announcer, the following today I come home for playing in the two days for dial the weather conditions, nanchang sunny today 16 to 26 degrees, nanchang cloudy tomorrow 17 to 30 degrees.

youdao

我是今天的播音员，下面由我来为打家拨报今明两天的天气情况，今天南昌晴天16至26度，明天南昌阴天17至30度。

I am the announcer, the following today I come home for playing in the two days for dial the weather conditions, nanchang sunny today 16 to 26 degrees, nanchang cloudy tomorrow 17 to 30 degrees.

youdao