How do you say

He and his friends are planning to take a trip together in three months.

..in Chinese?

他和朋友计划三个月后一起去旅行。

tā hé péng yǒu jì huà sān gè yuè hòu yì qǐ qù lǚ xíng 。

How do you say "What will the weather in Nanjing be like in the next three months?" in Chinese?