The summer heat continues. Humidity now rises, with thick fog hanging in many of the rooms. Torrential rain begins to strike throughout the caves, with violent storms ravaging their way through. Blinding downpours and deafening thunder take place frequently.

The water levels of the caves begin to rise, soon overflowing their banks. Previously gentle trickles become churning floods, while larger rivers become dangerous, roaring whitewater rapids. The lakes and ponds soon swell, too, so that some caves fill several inches with standing water, with dry ground difficult to find. It isn't certain how high these waters might rise. In particular, Pisces soon has little solid ground, and Fornax is a fully-flooded, raging, stormy sea with its islands entirely submerged. Cetus' swamp levels rise, so that the trees and marsh are islands in a vast lake, and Eridanus is spongy, muddy, and damp.

Plant life begins to sprout more frequently in Orion, Monoceros, and Canis. Only Hydra remains hot and dry.

In Fornax and Pisces, a strange, musty odor begins to rise with the floodwaters.