ame no hi mo, densya de tuukinsimasu.

の links 雨 and 日 together.

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

A very common Japanese pattern is:

noun + の + noun

This often means the noun modifies the noun after it. So here, 雨 describes what kind of day it is.

Other examples:

• 夏の日 = a summer day
• 休みの日 = a day off
• 試験の日 = the day of the exam

So 雨の日 is the natural way to say a rainy day.

Here, も means also, too, or sometimes even.

So 雨の日も、電車で通勤します suggests:

• I commute by train on rainy days too
• In other words, even when it rains, I still commute by train

It often adds the idea that the statement is true in that case as well.

For example:

• 日曜日も働きます。 = I work on Sundays too.
• 子どもも来ました。 = The children came too.

In this sentence, も emphasizes that rainy days are no exception.

A learner might expect 雨の日に because it means on a rainy day. And that is actually possible.

You can say:

• 雨の日に電車で通勤します。
• 雨の日にも電車で通勤します。

But in natural Japanese, に is often omitted with time expressions when the meaning is clear.

So:

• 雨の日も is natural
• 雨の日にも is also natural

The version without に sounds a little lighter and very normal in everyday Japanese.

A helpful way to think about it:

• 雨の日も = on rainy days too
• 雨の日にも = also on rainy days

Both work, and the difference is small here.

In this sentence, で marks the means or method used to do something.

So:

• 電車で = by train

This is the same で used for transportation and tools:

• バスで行きます。 = I go by bus.
• タクシーで帰ります。 = I go home by taxi.
• 箸で食べます。 = I eat with chopsticks.

So the structure is:

• 電車で = using the train
• 通勤します = commute

Together: commute by train

通勤します means to commute to work.

It comes from:

• 通勤 = commuting to work
• します = do

This is a suru verb, where a noun plus する / します becomes a verb.

So:

• 通勤する = to commute
• 通勤します = commute / will commute / do commute

Important point: 通勤 usually means commuting specifically for work, not just traveling to school or going somewhere in general.

Compare:

• 通勤します = commute to work
• 通学します = commute to school

Japanese often leaves out the subject when it is understood from context.

So even though the sentence does not say 私は, the meaning may still be:

• I commute by train even on rainy days
• or He/She commutes by train even on rainy days
• depending on context

In natural Japanese, repeating subjects all the time often sounds unnecessary. If the topic is already known, it is usually omitted.

For example:

• 私は雨の日も、電車で通勤します。 = explicitly As for me, I commute by train even on rainy days.
• 雨の日も、電車で通勤します。 = same basic idea, but the subject is left out

So this is very normal Japanese.

Japanese sentence order is different from English.

A useful basic rule is:

time / condition / method / place / other information + verb

And the main verb usually comes at the end.

So this sentence is structured like:

• 雨の日も = even on rainy days
• 電車で = by train
• 通勤します = commute

Japanese often puts the background information first and saves the main action for the end.

That is why the verb 通勤します comes last.

The comma in 雨の日も、電車で通勤します。 shows a small pause.

It helps separate the introductory phrase:

• 雨の日も、 = even on rainy days,
• 電車で通勤します。 = I commute by train.

In Japanese, commas are often used more flexibly than in English. They may be added:

• to make the sentence easier to read
• to show a pause
• to separate a topic or introductory phrase

So the comma here is natural, but in some cases it could be omitted:

• 雨の日も電車で通勤します。

Both are understandable.

In normal usage, 電車で通勤します means commute by train.

That is because で after a vehicle usually marks the means of transportation.

So:

• 電車で行く = go by train
• 電車で通勤する = commute by train

If you wanted to emphasize being physically inside the train, Japanese would usually use different wording, such as:

• 電車の中で = in the train
• 電車に乗って = riding the train / by taking the train

So in this sentence, the natural interpretation is definitely by train.