That took place on a Friday.
Sunan Abi Dawud Book 2, Hadith 669
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The rain was falling on the day when the Battle of Hunayn took place. The Prophet (ﷺ), therefore, commanded that the people should offer their prayer in their camps.
Sunan Abi Dawud Book 2, Hadith 668 Next Hadith → Usamah attended the Prophet (ﷺ) on the occasion of the treaty of al-Hudaybiyyah on Friday. The rain fell as little as the soles of the shoes of the people were not set. He (the Prophet) commanded them to offer Friday prayer in their dwellings.
Sunan Abi Dawud Book 2, Hadith 670
Sunan Abi Dawud Book 2, Hadith 668 Next Hadith → Usamah attended the Prophet (ﷺ) on the occasion of the treaty of al-Hudaybiyyah on Friday. The rain fell as little as the soles of the shoes of the people were not set. He (the Prophet) commanded them to offer Friday prayer in their dwellings.
Sunan Abi Dawud Book 2, Hadith 670