We often use the first one “明天要下雨了。” and some others may use the second one “明天会下雨。”.
There's no difference between them.
2010年10月24日
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to some degree,there is no differencebetween them ."要" is used to emphasize mood ,indicate the speaker's attitude toward the factuality or likelihood of the action or condition expressed.
it will be rain tomorrow.
it's going to rain tomorrow .
2010年10月24日
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其实通常没有特别严格的区别,一样的意思,就像it will rain 和 it's going to rain
2010年10月24日
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i think there is no obvious difference between "明天要下雨"and "明天会下雨"
these two sentences are interchangeable .