Across two decades, the Grand Theft Auto series has used the sky as both a clock and a barometer of technological ambition. What began as a cosmetic layer atop the streets of Liberty City has, by the time of Grand Theft Auto VI, become a physically simulated weather pipeline capable of staging Floridian thunderheads and hurricane-force squalls. This report traces that evolution from GTA III through to VI, focusing on how time-of-day (ToD) systems and weather grew from decorative overlays into systemic, gameplay-affecting features. It also evaluates whether VI's atmospheric tech constitutes a generational leap or a refinement of the long-iterated RAGE engine.
GTA III (2001) and Vice City (2002) ran on RenderWare and implemented weather and ToD as broad palette swaps. A compressed day-night cycle of roughly twenty-four minutes drove a tinted skybox, lamp activation and a small pool of weather presets — clear, cloudy, rainy and foggy. Rain in III was a screen-space particle layer with little interaction beyond muting traffic AI and slightly degrading vehicle handling. Fog in particular doubled as a draw-distance crutch on the PlayStation 2, hiding pop-in behind a thick haze rather than modelling actual atmospheric scattering.
San Andreas (2004) expanded the simulation to fit its three-city, 36-square-kilometre map. According to Rockstar's art director Aaron Garbut, distinct climate zones were established for each city, "differentiated by their sky colour: Los Santos's red-orange, San Fierro's blue, and Las Venturas's red" (Wikipedia, 2026a). The render pipeline was rewritten to support unique lighting sets for day and night, real-time reflections and volumetric lighting (Wikipedia, 2026a). Critics singled this out; IGN's Jeremy Dunham cited the differences in each city's weather as a highlight of the game's visual identity (Wikipedia, 2026a). Weather remained largely cosmetic at the systems level, however — sandstorms in the desert and coastal fog in San Fierro looked the part, but mission gating by weather was rare.
GTA IV (2008) was the first Grand Theft Auto built on the Rockstar Advanced Game Engine (RAGE), itself derived from Angel Studios's AGE codebase after Criterion's RenderWare was acquired by Electronic Arts (Wikipedia, 2026c). Liberty City's perpetually overcast palette was a deliberate aesthetic choice, but technically it leant on HDR lighting, wet-surface reflectance and bloom that the PS2-era engine could not have produced. IGN's Chris Stead, ranking RAGE among the generation's ten best engines, highlighted its ability to handle "large streaming worlds, complex A.I. arrangements, weather effects, fast network code and a multitude of gameplay styles" (Wikipedia, 2026c). Rain now beaded on windscreens, NPCs scattered for cover, and slick tarmac measurably altered Euphoria-driven car handling — the first time weather meaningfully reached into the simulation layer rather than sitting above it.
GTA V (2013) shifted the palette to a sun-bleached Los Santos. RAGE continued iterating: the 2015 PC release demonstrated 4K support, improved shadow mapping and tessellation, with later remasters adding ray-traced reflections and shadows on PlayStation 5 and Xbox Series X (Wikipedia, 2026c). Heat haze, god rays through smog and time-of-day-driven colour grading defined the look. Thunderstorms were rarer than IV's rain but more dramatic, and weather began to influence mission scripting (notably the heist getaway sequences). Yet the underlying cloud system remained largely a domed billboard rather than a true volumetric simulation.
The decisive technical inflection point came not in a GTA but in Red Dead Redemption 2 (2018). Digital Foundry's analysis described RDR2 as "a once-in-a-generation technological achievement", citing physically based rendering, volumetric clouds, volumetric fog and pre-calculated global illumination as headline advances (Wikipedia, 2026c). Euphoria was "radically overhauled" for new AI and physics behaviours that responded to environmental state (Wikipedia, 2026c). The cloud system in particular abandoned skydomes for true 3D volumes that cast shadows on the terrain and were lit consistently with the sun's position. This is the atmospheric foundation GTA VI inherits.
GTA VI is set within the fictional state of Leonida, based on Florida, encompassing Vice City, Grassrivers (the Everglades) and the Leonida Keys (Wikipedia, 2026b). It uses RAGE, with Digital Foundry's trailer breakdown noting visible step-changes over GTA V's engine baseline (Wikipedia, 2026b; Wikipedia, 2026c). The second trailer, captured in-engine on a base PlayStation 5, foregrounds the climate: towering cumulonimbus, lightning over the Keys, surface water response to wind, and what observers have interpreted as a hurricane simulation tying into the satirical "Florida Man" framing (Wikipedia, 2026b). The 2022 leak earlier confirmed dynamic weather across both Vice City interiors and exteriors (Wikipedia, 2026b).
Where San Andreas painted skies and IV scripted overcast moods, VI appears to simulate. Volumetric clouds, ray-traced ambient occlusion and global illumination — features ported back into the 2025 GTA V Enhanced PC build (Wikipedia, 2026c) — combine with a physically based atmosphere to produce conditions that look correct from any altitude and orientation, not merely from ground level.
The honest verdict is "both, and the distinction matters less than it sounds." RAGE has not been replaced; it has been continuously refined since 2006's Table Tennis. Each milestone — IV's HDR, V's PBR uplift, RDR2's volumetrics, V Enhanced's ray-traced GI — represents incremental engineering that, viewed across the whole arc, amounts to a generational transformation. VI's atmospherics are not a clean-slate departure but the cumulative payoff of two decades of investment, now applied to a climate (subtropical Florida) that exposes weather systems to player scrutiny in ways previous settings did not.
The series's weather and ToD systems trace a clean arc from cosmetic overlay to integrated simulation. III's tinted fog masked draw distance; San Andreas regionalised climate as aesthetic identity; IV used weather to drive handling and NPC behaviour; V refined the palette; and VI promises atmosphere as a first-class system. Whether one calls it a leap or an incremental refinement of RAGE, the result is the same: skies that are no longer a backdrop but a participant in the simulation.
Wikipedia (2026a) Grand Theft Auto: San Andreas. Available at: https://en.wikipedia.org/wiki/Grand_Theft_Auto:_San_Andreas (Accessed: 14 May 2026).
Wikipedia (2026b) Grand Theft Auto VI. Available at: https://en.wikipedia.org/wiki/Grand_Theft_Auto_VI (Accessed: 14 May 2026).
Wikipedia (2026c) Rockstar Advanced Game Engine. Available at: https://en.wikipedia.org/wiki/Rockstar_Advanced_Game_Engine (Accessed: 14 May 2026).