I will comment on the two sentences you wrote, then I will suggest the more common way to say the same thing.
"It's good weather today" - English speakers almost never say it this way.
"it's a good weather today" - this is not proper English as Brad explained (no "a")
The weather is good today.
Today the weather is good.
Dark Panther's sentence is also correct.
1 de noviembre de 2010
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"It's good weather today." We never use "a" with "weather" unless we are referring to "a weather emergency" or some other example where "weather" is an adjective.
1 de noviembre de 2010
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What fine weather we have today!
1 de noviembre de 2010
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"The weather is good today."
The native way to express this:
"It's a nice day today." (the implied meaning is that the weather is pleasant)
20 de mayo de 2014
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In your original question, "weather" a noun; in my answer, I said that you could use the articles a/an/the if you turned "weather" into an adjective. So yes, we can also use articles before other adjectives like "good."
1 de noviembre de 2010
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