הוא שונא לחכות בתחנה כשיש גשם.

A natural pronunciation is:

Hu sone lekhakot batachana ksheyesh geshem.

A few helpful sound notes:

• הוא = hu
• שונא = sone
• לחכות = lekhakot
• תח / ח has a throaty kh sound, like the ch in Scottish loch
• כשיש is said roughly as kshe-yesh
• גשם = geshem

שונא is the masculine singular present-tense form of the verb לשנוא (to hate).

Because the subject is הוא (he), Hebrew uses the masculine singular form:

• הוא שונא = he hates
• היא שונאת = she hates

This is very normal in Hebrew: present-tense verbs change for gender and number.

The ל־ at the beginning marks the infinitive, like English to in to wait.

So:

• לחכות = to wait

After verbs like שונא (hates), אוהב (likes/loves), or רוצה (wants), Hebrew commonly uses an infinitive:

• הוא שונא לחכות = he hates to wait
• very naturally also: he hates waiting

Hebrew ב־ can mean in, at, and sometimes even on, depending on context.

With a place like a station, English usually prefers at:

• בתחנה = at the station

Also, there is an important spelling point:

In unpointed Hebrew, בתחנה can mean either:

• at a station
• at the station

Why? Because when ב־ combines with ה־ (the), the form changes in pronunciation, but in normal unvoweled writing it often looks the same. So context tells you which one is meant.

Literally, it means:

when there is rain

That is why the natural English translation is:

• when it’s raining
• or when there’s rain

So Hebrew is being a little more literal than English here.

יש means there is / there are.

Hebrew often uses יש in expressions about existence or presence, and that can include weather-like ideas:

• יש גשם = there is rain
• natural English: it’s raining / there’s rain

So even though English uses it is raining, Hebrew can express the idea with יש.

Because כש means when, while אם means if.

So:

• כשיש גשם = when it’s raining
• אם יש גשם = if there is rain
• אם יהיה גשם = if it rains / if there will be rain

In your sentence, the meaning is not conditional; it is talking about the time or situation in which he hates waiting. So כש is the right choice.

Because גשם here means rain in a general sense.

Hebrew often leaves mass nouns like this without ה־ when speaking generally:

• גשם = rain
• not necessarily the rain

This is similar to English. We usually say:

• I don’t like rain not
• I don’t like the rain

If you said הגשם, it would sound more specific, as if you were referring to a particular rain or a rain already mentioned.

Yes. Hebrew word order is fairly flexible.

The original sentence is very natural:

הוא שונא לחכות בתחנה כשיש גשם.

But you can also move the time clause to the front:

כשיש גשם, הוא שונא לחכות בתחנה.

That means the same thing, but it gives a little more emphasis to when it’s raining. The original version is the more neutral flow.

Yes. That is also very common.

• כשיש גשם = when there is rain
• כשיורד גשם = when rain is falling

In natural English, both can be translated as when it’s raining.

Often, כשיורד גשם sounds a bit more direct or vivid, because it focuses on the rain actually falling. But כשיש גשם is completely normal and understandable.