Chinese Test: It won’t rain today, will it?

Beginner Level 初级 (chūjí)

Conversation:

Lisa and Jen are going to do some shopping.

       Jīntiān bú huì xiàyǔ ba. Lisa: 今天  不  会  下雨 吧。

       Bù zhīdào ,wǒmen dàishang sǎn ba.  Jen: 不 知道, 我们      带上         伞 吧。

What does “会 (huì)” mean in this …