Hello,
Just want to give my findings on this trophy. Trophy achieved on 13 Jun 2021
Animals on Raft:
Hog x2
Boar x2
Snakes x2
Crab (Small) x2
Animals in inventory:
Seagull x2
Bat x2
Raft Size: 5x3
Attempts: 7 tries
6th Attempt: I managed to get into the ocean at the first sign of rain, however the trophy never appeared throughout the entire storm nor did it appear when weather was calm again. Restarted to last save
7th Attempt: Loaded the animals the same way as described above and immediately set out into the ocean before the storm. Trophy was achieved soon after leaving the island’s vicinity. Afterwards, the first drops of rain appeared followed by a storm. A user mentioned that this happened to him as well, going to another island. Though I wonder if it started to storm shortly after he ventured off.
If he did, my guess is that users can probably unlock the trophy by venturing into the ocean before even the first raindrops fall. Which to me, sounds like you need to be caught up in the storm while in the middle of the ocean rather than running out toward your raft at the first signs of weather change and hope the trophy works.
Edit: Mistakened on the Raft size. It was 5x3 not 5x5