I had a similar experience in my game but it is very rare.
Enable weather effects on Sims and save under Seasons options.
Before going back in game disable that option and save again.
For me it kept my Sim from a weather related death.
Does the forecast say "mysterious weather"?
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I am on PS4 and I'm experiencing these issues also. I have all weather disabled and weather effects as well. I have experienced this error on a brand new save and on a my current save. 8/1/20
Product: The Sims 4
Which language are you playing the game in? English
How often does the bug occur? Occasionally (50%)
What is your current game version number? 18.104.22.1680
What expansions, game packs, and stuff packs do you have installed? All apart from Halloween & Knitting packs
Steps: How can we find the bug ourselves? Disable snow and storms it still appears in winter
What happens when the bug occurs? There are still storms and snow despite me disabling them in my settings. I have been experiencing the majority of the 'ECO Bugs' especially the lagging problem since installing EC Lifestyle that the majority of players have been reporting
What do you expect to see? Fix the bugs unfortunately it's destroying game play
Have you installed any customization with the game, e.g. Custom Content or Mods? MCCC removed and re-tested problem still exists.
Did this issue appear after a specific patch or change you made to your system? Installation of Eco Lifestyle game and patches
I’m not sure if this is helpful but this is also occurring for me in my 1 save and both times it generated a t storm despite having them disabled, it was on a “mysterious weather” day
I have disabled lightning in one of my saves as I have eight sims living in a micro home, therefore they spend most of their time outdoors. On a mysterious weather day the mom to 4 children got hit by lightning and died, it was very frustrating.