1. 오늘 날씨가 좋습니다.
I am expressing how great it is today. A general expression of 'it's a good day'.
2. 오늘은 날씨가 좋습니다.
For the last few/several days, the weather has been bad. But it is great 'today'!
3. 오늘 날씨는 좋습니다.
I am not happy with many things except today's good weather.
August 23, 2018
1. 오늘 날씨가 좋습니다. Today's weather is good.
2. 오늘은 날씨가 좋습니다. Today's weather is good. or Today, the weather is good.
3. 오늘 날씨는 좋습니다. Today's weather is "good". or The "weather" is good today.
It depends on the context, nuance, accent.
August 21, 2018
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