Cities: Skylines II Patch 1.5.9f1 - Morning Dew Notes (27th May 2026)

Hello Mayors!

Patch 1.5.9f1 is now live, bringing improvements to the vehicle pathfinding and fixes to some of the bugs you have reported through PDX Forums! There is also a significant update to shadow rendering that aims to mitigate various visual artifacts occurring at both short and long distances, and we implemented updated localization after a lot of feedback from the community (especially for Simplified Chinese).

This patch should not affect mods, and loading of old savegames is supported.

If you have anything that you want to report to us after trying this new patch, please share it with us on our Bug Reporting board.

Gameplay:

• Vehicles now make fewer unnecessary U-turns.
• Vehicles now choose their turn lanes earlier when approaching highway exits or intersections.
• Fixed bug where citizens and companies used the electricity fee instead of the water fee when calculating electricity costs.
• Fixed game crashing upon interacting with a DLC transportation line in a vanilla game session.
• Fixed case where Coal Power Plant was unable to send out vehicles to buy coal.
• Delivery trucks now properly leave specialized industry buildings, such as farms, to export and sell their stock, preventing cargo from piling up.
• Natural resources now deplete at the intended slower rate on easy mode.

UI:

• Education overlay now shows the correct number of eligible students for Elementary School.
• Fixed UI disappearing when certain zoned buildings were built in road corners.
• Hotels no longer show the wrong customer count. The count will reset at midnight.
• You can now filter assets from Region Packs and asset mods in the build menu.

• The benchmark screen now shows your screen resolution instead of the game version.
• Small improvements to the UI of the benchmark page.
• Added zone cell grid and zone cell border color/transparency sliders.
• Tool parameter values like road elevation now carry over when switching between related tools.
• Small fixes to encyclopedia typos and incorrect information.
• Fixed controller scrolling issues in the Glossary with higher text scale values.
• Fixed the Glossary search bar turning bright green when selected with a controller.

Visual:

• Fixed shadow rendering distance jumping toward the horizon. When looking toward the horizon and tilting the camera up and down, the shadow render distance would jump, causing shadows to disappear and reappear in the distance.
• Fixed shadow cut off when zoomed close to the ground. When looking straight down and zoomed close to the ground, shadows were cut off near the edges of the screen.
• Fixed uneven shadow cascade distribution. Shadow cascade levels were not distributed evenly, causing shadow quality to drop close to the camera, especially on low shadow quality settings.
• Slightly improved tree shadows flickering while the simulation is running and the sun moves.

Misc:

• Fixed Volumetrics Quality Settings not working in settings.
• Fixed a Region Pack serialization issue related to fire hazard setting.
• Fixed an error in the game when starting the game without Discord running.
• Fixed localization issues across several languages.
• Fixed an error that could occur when deactivating a playset, causing long deactivation times.
• Cleaned up unnecessary CSS warning messages from the game log.

Mods:

• Modding.log now lists the active playset and enabled mods.
• Mod loading at launch improved. If mods are not loaded in two seconds, the game will continue to the main menu and download the rest in the background.

Editor:

• Custom water and terrain no longer break autosaving.

City Stations Creator Pack:

• Compact Bus Depot: Adjusted unlock criteria to ensure this building is available without needing an existing bus depot on the map.
• Small Bus Terminal: Fixed the direction of the bus lanes so that bus doors now face toward the bus stop.
• City Central Train Station: Corrected the placement of a lighting asset that was mistakenly positioned multiple meters beneath the terrain surface.
• Compact Refurbished Tram Depot: Improved the tram track connection to the road the depot is placed on when the turning angle is very sharp.
• Small Tram Plaza: Fixed the asset so it no longer incorrectly shows a "Road Required" notification when placed on Medium Roads or larger, and Pedestrian Streets.

Known Issues:

• The Microsoft Store build is missing the taskbar icon.
• Launching a new game with “all map tiles unlocked” and tutorials on will result in only the starting tiles being unlocked for some players.
• Benchmark screen may incorrectly display the refresh rate as 60 Hz regardless of the actual monitor refresh rate in use.