kyou wa harete iru node, kasa o motte ikanakute mo daijoubu desu.

It is sunny today, so there is no need to take an umbrella.

Breakdown of kyou wa harete iru node, kasa o motte ikanakute mo daijoubu desu.

• は: topic particle
• です: to be
• を: direct object particle
• 今きょ日う: today

Questions & Answers about kyou wa harete iru node, kasa o motte ikanakute mo daijoubu desu.

Why is は used after 今日?

今日 は sets today as the topic of the sentence.

So the sentence is framed like:

• As for today, since it’s sunny, you don’t need to take an umbrella.

In Japanese, は often marks what the speaker is talking about, not necessarily the grammatical subject in the English sense.

A learner may expect no particle after a time word, and that is also often possible in Japanese. But here, 今日は gives a clear topic-setting feeling: speaking of today...

Why is it 晴れている instead of just 晴れる or 晴れです?

晴れている describes the current state of the weather: it is sunny.

Breakdown:

• 晴れる = to become clear / to clear up / to be sunny
• 晴れている = is in the state of being clear/sunny

With weather, Japanese often uses the -ている form to describe the present condition.

Why not the others?

• 晴れる by itself often sounds more like will clear up / clears up
• 晴れです is possible in some contexts, but 晴れている feels more natural when talking about the actual weather condition right now

So 今日は晴れているので means something like:

• Because it is sunny today...

What does ので mean here?