4 sentences

1. 苏丹的雨季已经开始了。

   Sū​dān de yǔ​jì yǐ​jīng kāi​shǐ le.

   The rainy season has begun in Sudan.

   Source: Tatoeba

2. 这里的雨季通常在六月开始。

   zhè​lǐ de yǔ​jì tōng​cháng zài Liù​yuè kāi​shǐ.

   The rainy season here usually begins in June.

   Source: Dong Chinese Dictionary

3. 这个水库在雨季可以储水，以备旱季使用。

   zhè gè shuǐ​kù zài yǔ​jì kě​yǐ chǔ​shuǐ, yǐ bèi hàn​jì shǐ​yòng.

   This reservoir stores water during the rainy season for use in the dry season.

   Source: Dong Chinese Dictionary

4. 政府正在组织附近村庄的群众做好雨季防洪工作。

   zhèng​fǔ zhèng​zài zǔ​zhī fù​jìn cūn​zhuāng de qún​zhòng zuò hǎo yǔ​jì fáng​hóng gōng​zuò.

   The government is organizing villagers to prepare for flood control during the rainy season.

   Source: Dong Chinese Dictionary