Weather states

DVS can produce ten weather states. Which one is active at any moment is the result of the simulated temperature, humidity, biome, and altitude, biased by your Weather Weight and Weather Frequency settings.

The ten states

Clear Sky
Partially Cloudy
Cloudy
Overcast
Foggy
Light Rain
Moderate Rain
Windy
Light Snow
Moderate Snow

Whether you get rain or snow is decided by the simulated temperature: a cold biome at high altitude will see snow where a tropical biome would see rain. You do not pick “rain” or “snow” directly; you set the location, biome, time of year, and weight, and the system chooses.

What controls transitions

Four settings on BP_DynamicVolumetricSky shape weather behavior:

Setting	What it does
Dynamic Weather	Master toggle. Off = weather stays fixed at whatever it currently is.
Weather Frequency	How often weather changes. Higher = more variety per game-day.
Weather Weight	Bias toward precipitation. `0` = always dry, `1` = strong rain/snow tendency.
Weather Transition Speed	How quickly one state morphs into the next. Higher = sudden weather, lower = slow drifts.

Biome and weather

The selected Terrestrial Biome biases temperature, humidity, and weather frequency. Seven biomes ship with the system:

Tropical Rainforest
Savanna
Desert
Mediterranean
Temperate Forest
Boreal Forest
Arctic Tundra

A Desert biome rarely produces rain even at high Weather Weight. An Arctic Tundra produces snow far more often than rain. Pair the biome with Latitude, Altitude, and Current Month to get the climate you want without fighting the simulation.

Camera-lens rain effect

When the active state is rainy, the system applies a screen-space rain effect through a built-in post-process material. It only shows when the camera is exposed to the sky (the indoor occlusion system suppresses it indoors).

Where to next

Location and weather reference: every Location and Weather category setting
Indoor occlusion: how the system stops rendering weather inside buildings