Rain



Rain occurs randomly when if you have bug and affects all surface biomes for its duration. Each Rain event lasts for 24 in-game hours (24 real-world minutes), spanning both day and night portions. When a player is in a Snow biome during Rain, it appears as a Blizzard, causing snowfall volume to increase. Rain also increases cloud cover.

Rain is primarily an aesthetic effect, only visible on the surface: It displays Rain/Blizzard graphics, darkened ambient sun/moon light, and altered music. There are however some functional effects.

Rain does not actually produce new water tiles, does not cause existing water levels to rise, and has no effect on lava or honey tiles, but it does spawn some unique enemies or enemy variants, and certain critters behave differently. Some comical effects include Zombies wearing rain coats, Slimes carrying umbrellas, and Goldfish walking upright on land, using their tail fins to casually shuffle about (swimming Goldfish will exit water and walk, and walking Goldfish will also spawn anew on land).

On the, rain has three different variations; Light Rain, regular Rain, and Heavy Rain. The heavier the rainfall, the dimmer the sunlight will be, with Monsoon causing noticeable darkness. These variations are only graphical, can be detected with a Weather Radio, and can change multiple times throughout a single downpour.

Other effects include the following:
 * There is a +20% Fishing Power bonus in all liquid bodies during Rain.
 * Waterleaf blooms.
 * Worms spawn frequently in Forest biomes.
 * NPCs remain in their houses, as if it were night.
 * The player character will squint in blizzards if they are outside.

Trivia

 * There was once going to be a "rain accumulation" mechanic, which would make the rain flood holes, bunkers and similar structures, and the player would then have to build systems to get rid of the water. However, this mechanic was later scrapped, for unknown reasons.
 * The chance of Rain occurring is permanently 18.2% and does not fluctuate for between 2 minutes and 24 seconds and 24 minutes immediately after world generation.
 * Rain's animation stops when the screen is exited in windowed mode (unlike other animations).
 * When it is raining and snowing at the same time, the snow animation stops, but not the rain animation.
 * Rain Cloud blocks cause a rain effect, which however is entirely unrelated to the Rain event and is purely aesthetic.
 * If Rain coincides with a Blood Moon, Rain will appear to be red-colored.
 * If the game is exited to the title screen during Rain, the background will show fog. This happens even when going into a new world and exiting again. To remove the effects, the game needs to be closed.
 * In old Mobile Versions and both and  Old-gen console versions, the Morning Rain music used to be exclusive through the Tutorial. It has since been implemented into the  as the Morning Rain theme.