ame no hi ha, abunai miti wo sakete kaerimasu.

雨の日 means rainy day or more literally the day of rain.

The particle の links the two nouns:

• 雨 = rain
• 日 = day
• 雨の日 = a rainy day / a day when it rains

If you said 雨は, then rain itself would be the topic. But in this sentence, the topic is rainy days, not rain in general.

Because the whole phrase 雨の日 is the topic.

• 雨の日 = rainy day(s)
• 雨の日は = as for rainy days / on rainy days

So は is not just marking day by itself. It is marking the entire expression rainy days as the topic of the sentence.

危ない is an い-adjective, and it directly modifies the noun 道.

• 危ない = dangerous
• 道 = road, path
• 危ない道 = dangerous road(s)

This works like English adjective + noun order:

• 危ない道 = dangerous roads
• not 道危ない

In Japanese, い-adjectives usually come before the noun they describe.

The particle を marks the direct object of the verb.

Here, the verb is 避けて from 避ける, meaning to avoid.

So:

• 危ない道を避けて = avoiding dangerous roads

The roads are what is being avoided, so they take を.

The て-form connects actions.

Here, 避けて帰ります means something like:

• avoid dangerous roads and go home
• go home while avoiding dangerous roads
• go home by avoiding dangerous roads

So 避けて links to 帰ります.

This does not necessarily mean two completely separate actions in strict order. It often shows that the first action is connected to the second, or describes the way the second action is done.

Usually it is understood more naturally as go home while avoiding dangerous roads.

The て-form can show sequence, but in this kind of sentence it often expresses the manner or condition of the main action.

So the nuance is closer to:

• I go home, avoiding dangerous roads
• On rainy days, I avoid dangerous roads on my way home

rather than two sharply separated actions.

帰ります comes from 帰る, which means to return or to go home.

In everyday Japanese, 帰る is very commonly used for going back to one’s home or usual place.

So:

• 帰ります = go home / return

It sounds natural here because the sentence is about the route someone takes when heading home.

The subject is omitted, which is very common in Japanese.

From context, it could mean:

• I go home avoiding dangerous roads on rainy days
• We go home avoiding dangerous roads on rainy days
• One should go home avoiding dangerous roads on rainy days

In many textbook-style sentences, English learners often understand the hidden subject as I unless context suggests otherwise.

Because 雨の日 is being presented as the topic, not just as a time setting with で.

Japanese often marks time expressions directly without a particle, or uses は when the speaker wants to make that time expression the topic.

So:

• 雨の日は = as for rainy days / on rainy days
• very natural for talking about what happens in that situation

Using で here would sound unnatural, because で usually marks a place of action, means, cause in some cases, and other functions—but not this kind of simple time-topic expression.

The comma is mainly for readability.

In 雨の日は、危ない道を避けて帰ります。, the comma creates a small pause after the topic:

• As for rainy days, ...

It helps separate the topic from the rest of the sentence, but it is not mandatory. The sentence could also be written without the comma:

• 雨の日は危ない道を避けて帰ります。

Both are fine.

Yes. Because 帰ります is in the non-past polite form, it can describe:

• a habitual action
• a general practice
• a future action, depending on context

In this sentence, with 雨の日は, it most naturally sounds like a habit or usual behavior:

• On rainy days, I go home avoiding dangerous roads.

So it is not just about one specific rainy day unless context makes it specific.