I'm very relieve to know Fallout 4 will have a weather system. I've even heard about some kind of radiation storm being inn Fallout 4 as well. I hope we get other types of weather in Fallout 4?

Well, rain was shown in the E3 trailer way too briefly. I'd personally like to see snow, but I can't really tell when the game takes place so I don't know if it would be the right season or not.

Typhoons and rabid giraffes.

anything that you would expect, including realy bad weather. So Rain, wind, lightning storms, sun, cloudy, you name it. Some nice extreme stormy weather might be fun to, maybe a sand storm out in the wastes beyond anny buildings and such. The only think i would maybe not expect is snow and hail

• radioactive rain forcing you to seek shelter or become irradiated. Should force NPCs/creatures to seek shelter as well, providing potential for great encounters.
• if there's wasteland, I want dust storms. The Mad Max Fury Road kind that spans the entire horizon.
• mini tornados
• fog, severely limiting visual range and dampening sound
• glaring sunshine with fata morganas (and if there's food/drink hardcoe mode, increasing your fluid intake)
• lightning - which is attracted to power armor
  
• Bonus: meteor and/or space junk showers, e.g. left over satellites coming screaming down to earth, possibly bringing the occasional worthwhile loot from ages past

glowing green hail storms .

storms and hurricanes

It's Boston, there should be SEASONS. Unless the world/climate was tossed really off kilter by the war.....

Good 'Ol Nor'Easter would be pretty fun.

I like all these ideas, I'd love for some of them to affect your gear too. Energy weapons in poor condition in the rain, might shock you.. greater chance of gun jamming during/after sandstorm.. things of that nature

I was thinking the same thing. Nothing says Northeast like a winter snow storm. I understand seasons were implemented in Skyrim during a post-release dev test; I don't see why they couldn't do them for FO4 four years later. They'd definitely add a lot to the game. I can understand the argument that not everyone would see them--but if you start the game in late summer, most players should make it to winter; I've had Morrowind games last over a year, and my last FNV game was over six months. A change in seasons in the Mojave might not mean much, but it should in Boston.

Snow please. We had it on the ground in NV but only mods added snowy weather.

Have they said anything about how weather is just a cosmetic sort of thing or do we also get some weather effects akin to emissions from S.T.A.L.K.E.R. ?

I would be surprised if we didn't see some snow effects given what they did with Skyrim, they already have the capability of implementing it so why not use it. As for how it fits into the story, contextually it makes sense that there might be sections of nuclear winter.

I would like the basic, rain, wind sun.

I'd rather like certain storms that force you to take shelter or construct temporary shelter.

Seasons would be cool. The extra resources at their disposal might make it possible, as like mentioned above, they got it working in testing during the game jam in skyrim.