Different types of weather effects such as snow and rain can be created using the fog emitter object that is available with the Ambitions expansion pack. While this does not give us full weather effects like an expanion pack would, it is fun to look at in the game or use for creating a machinima. Below you will find a tutorial showing the steps I used to create these effects in my game.
NOTE: More information can be found in the original topic that was posted in The Sims 3 Forums.
*Required Games

Start your game and load one of your Sim families. Go to Buy Mode. Open the cheat window by pressing Shift + Ctrl + C. Type in testingcheatsenabled true and press Enter. Next, type in buydebug and press Enter. You should see an objects menu appear. Click on the Misc. Objects tab and scroll down to the Fog Emitter.

Buy it and place it somewhere on the lawn. To activate the menu, press Shift + Ctrl and click on the object. Make sure that visual effects are enabled, then select Set Visual Effect.

In the box that pops up, type in the visual effect you would like to spawn using one of the codes below and click on the check mark.

Visual Effect Codes for Weather (a complete list can be found here)
rainheavydaytime
rainheavynighttime
rainlightdaytime
rainlightnighttime
raintorrentialdaytime
raintorrentialnighttime
snowfallingheavyday
snowfallingheavydaytime
snowfallingheavynight
snowfallingheavynighttime
snowfallinglightday
snowfallinglightdaytime
snowfallinglightnight
snowfallinglightnighttime
Go to Live Mode and you should now see the weather effect you entered. To change to a different type, press Shift + Ctrl and click on the fog emitter in Buy Mode. Select Reset Visual Effect > Set Visual Effect, then type in a new code.


Videos of the snow and rain weather effects that I have created can be found HERE.

This is great, Carrie! Can the fog emitter be programmed this way in the WORLD setting (in CaW)?
Thanks Linda! I’m not sure. I will have to test that out. I think Kim had said something about it working in CaW.
I cant find the fog Emitter. And yes, I type the bydebug cheat
Please make sure you spell the cheats correctly. It should be “buydebug” not “bydebug.” If you continue to have problems getting the fog emitter to show up, please let me know. Thanks!
i cant find the fog emitter
( help please
Did you get the objects menu to come up using the buydebug cheat? If so, it should be under the Misc. Objects tab. The tab has 3 dots on it. Scroll down until you see the Fog Emitter. It looks like a teal colored round object.
it’s buydebug ON
All you need to type in is buydebug, but you must be in Buy Mode. After you put in the buydebug cheat code, the Debug category will show up with a ?. It should already be selected. Then, go to the Misc. Objects tab (3 dots) and scroll down until you get to the Fog Emitter.
Finding the Fog Emitter:
All you need to type in is buydebug, but you must be in Buy Mode. After you put in the buydebug cheat code, the Debug category will show up with a ?. It should already be selected. Then, go to the Misc. Objects tab (3 dots) and scroll down until you get to the Fog Emitter.