Weather FX - 34 Rain, Snow & Fog VFX

34 animated 2D weather effects for Unity, one line of C# each. Every effect is a single shader on a single quad: no textures, no particle systems, sharp at any size.

var rain = WeatherFX.Add("rain").Set("density", 0.8f);
WeatherFX.Add("fog").Set("color", new Color(0.9f, 0.9f, 1f)).FadeIn(3f);
WeatherFX.Add("water").Place(new Vector2(-6.4f, -1.4f), new Vector2(12.8f, 2.2f));
var storm = WeatherFX.Add("lightning");
storm.Strike();
rain.Stop(2f);
weather.Change("storm", 6f); // a WeatherSystem: rain, storm clouds and lightning fade in

What's inside

Weather that covers the camera's view and follows it: rain (with splashes), snow, hail that bounces, fog, low mist, lightning, falling leaves or petals, a sandstorm, wind streaks, cloud shadows, god rays, heat haze

Storms: heavy storm clouds lit from within by flashes, a tornado whirling debris, a blizzard in gusts

Sky: the sun with rays and lens flare, the moon in any phase or cycling through them, stars with shooting stars, a meteor shower, an aurora, drifting pixel-art clouds in three layers, a rainbow

In the air: falling ash, rising embers, fireflies blinking at dusk, pollen and dandelion fluff, underwater bubbles

Water: a lake that reflects your scene with waves and glints, raindrop ripples on it, a waterfall with foam and mist, underwater caustics

On the glass: rain on a window, beads that bend the scene behind them and drops running down; frost creeping in from the edges

Time of day: day_night tints the whole scene from dawn through noon and dusk to night, held or cycling

Weather states: a WeatherSystem component changes the weather in one call, the old effects fading out as the new ones fade in: clear, cloudy, drizzle, rain, storm, hail, snow, blizzard, fog, windy, sandstorm, heatwave and ashfall. Give it a forecast of weighted states and it changes on its own. New in 1.3.

• Colour, strength, speed and wind on every effect, plus settings of its own: density, drop length, fog height, ray count, wave height, strike frequency...
• Pixel-art mode: set PixelSize on one effect, or WeatherFX.DefaultPixelSize once for the whole game, and the effects draw in crisp, world-aligned pixels that match your art.
• Layer them: rain over water with lightning, an aurora over fireflies, ash with embers, fog under god rays.
• Patterns stay put in the world while the camera moves, orthographic or perspective.
• FadeIn() and Stop() for weather that comes and goes; Strike() for lightning on cue.
• Add a WeatherFX component to an object and it shows in the editor too.
• Demo scene: a pixel-art landscape in 12 moods, toggle and stack every effect, or step through the weather states.

Compatibility

• Unity 6.3 or later, in any render pipeline: Built-in, URP (2D or Universal Renderer) and HDRP.
• Either input handler for the demo: the Input Manager or the Input System.