는/은 is simply used to show the topic or subject of a sentence, and holds no other value. 는 is used for nouns without a final consonant, and 은 for nouns with a final consonant.
저는 제인입니다 (I am Jane). 저(는) 저 which means “I” is the topic and subject of the sentence hence i used “는”.
Also note that also though “이/가” represents the subject, these are replaced with “은/는” when the subject is also the topic of the sentence.
As you can see all though the subject of the sentence is weather(가), i wanted to make the topic of the sentence “today” so i placed the the topic particle on to “today”.
If i had said, 오늘 날씨는 안 좋합니다. The sentience is still valid, i have just made the topic of the sentience the “weather”.
If a Korean word ends in a vowels we use (는) ~ 제인 씨는 좋합니다 (I like Jane)
If a Korean word ends in a constant we use (은) ~ 그 집은 좋아합니다 (I like that house)
Also note that 은/는 particle is generally always used in the beginning of the sentence.
If we do not use particles in Korean sentences Koreans would not be able to understand what you are saying. So its very important to make sure you add the right particle in the right place. In the beginning it is confusing but soon it is very easy to understand.
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Korean Grammar Beg. ~이/가 (Subject of the sentence)