Docs/Lighting

Weather

Add rain, snow, fog, and wind effects to your game world.

17 min read Intermediate Updated 2026-07-01 v2.0 ~55 min to complete

Introduction

Weather systems add atmosphere and gameplay variety. This guide covers rain, snow, fog, wind, and weather state transitions.

Guide 6 of 25

This is part of the Intermediate Guides collection. Category: Lighting. Estimated completion: 55 minutes. Difficulty: Intermediate.

Screenshot

Step-by-Step Guide

Create a weather manager

Add an empty object named WeatherManager with a script to centralize weather state.

Add rain particles

Create a particle system for rain. Set emission rate (500-2000/sec), direction (wind-affected), and speed.

Add snow particles

For snow, use slower particles with sway. Lower emission rate (100-500/sec) and larger size.

Configure fog

Add exponential fog with adjustable density. Rain increases fog; snow uses brighter fog color.

Set wind

Configure global wind direction and strength. Wind affects particles, grass, trees, and cloth.

Transition weather states

Smoothly lerp between presets (clear, cloudy, rain, storm, snow) over 10-30 seconds.

FluxScript Example

Here is a complete FluxScript implementation for this guide:

Weather — FluxScript

state = "clear"
const PRESETS = {
  clear:  { fog: 0.01, rain: 0,    wind: 0.2, light: 1.2 },
  cloudy: { fog: 0.03, rain: 0,    wind: 0.5, light: 0.8 },
  rain:   { fog: 0.06, rain: 800,  wind: 1.0, light: 0.5 },
  storm:  { fog: 0.10, rain: 2000, wind: 2.5, light: 0.3 },
  snow:   { fog: 0.08, snow: 300,  wind: 0.8, light: 0.6 }
}

func setWeather(newWeather) {
  state = newWeather
  p = PRESETS[newWeather]
  scene.setFog(p.fog)
  scene.find("RainSystem").setEmissionRate(p.rain || 0)
  scene.find("RainSystem").setVisible(p.rain > 0)
  world.setWind(p.wind)
  scene.find("SunLight").setIntensity(p.light)
  ui.toast("Weather: " + newWeather)
}

on timer("weatherCycle", 120) {
  options = ["clear", "cloudy", "rain", "storm", "snow"]
  setWeather(options[math.random(options.length)])
}

Node Graph Example

Prefer visual programming? Here is the equivalent Node Graph:

Weather — Node Graph

[Function: setWeather] --> [Get Preset]
   --> [Set Fog] --> [Set Rain emission + visibility]
   --> [Set Wind] --> [Set Sun Intensity] --> [Toast]

[On Timer "weatherCycle" 120s] --> [Random: weather type]
   --> [setWeather]

Optimization Tips

Keep your implementation fast and efficient with these optimization tips:

Use shaders for rain instead of particles on mobile. A screen-space rain shader is 5x cheaper than 800 particle drops.
Pool weather particle systems. Do not create/destroy per weather change — toggle visibility and adjust emission rate.
Limit fog density on mobile. Exponential fog is expensive in fragment shaders.
Smoothly transition between weather states over 10-30 seconds. Instant changes feel jarring.