User blog comment:Woganhemlock/The Sims 3: Supernatural announced/@comment-4142862-20120613082932/@comment-1519608-20120613112104

I wouldn't be surprised if TS3 doesn't get a weather EP, for a couple reasons. Seasons/weather has been highly requested since TS3 was released, and they haven't included it, so I'm hesitant to think they will later on. Plus adding weather to the game presents technical problems I'm sure, and they probably don't want to release an EP that will negatively impact users of lower-end computers, such as those that barely meet the minimum requirements for running the game. The inclusion of weather in the game might 'tip the balance' towards lower-end machines not being able to run the game.

In any case, I'm hopeful that they do release one, but I won't be surprised if they don't. I'm just hoping that they'll include it in the basegame for TS4 (or whatever's coming after TS3)... but I know that they won't because they're EA and they'll want to save all the good and popular features for DLC and expansions.