Nereye gidersek gidelim, hava durumuna bakmalıyız.

Nereye means to where / where to. It is built from nere + the directional ending -ye.

That fits gitmek, because going involves a destination.

• nereye gidiyoruz? = where are we going?
• nerede kalıyoruz? = where are we staying?

So in this sentence, nereye is correct because the verb is gitmek.

This repetition is a very common Turkish pattern meaning no matter... or whoever/wherever/whatever...

So:

• Nereye gidersek gidelim = wherever we go / no matter where we go

Turkish often does this with a question word plus two forms of the same verb:

• Ne yaparsan yap = no matter what you do
• Kim gelirse gelsin = whoever comes
• Nereye gidersek gidelim = wherever we go

So the repetition is not redundant. It creates a special concessive meaning.

Gidersek can be analyzed as:

• gid-er = go / would go / generally go
• -sek = if we

So literally it is something like if we go.

In this sentence, though, it is part of the larger pattern gidersek gidelim, so you should understand it together rather than translating each word separately.

Also note that gitmek becomes gid- in some forms:

• gitmek
• gider
• gidelim

This is normal for this verb.

Yes, by itself gidelim often means let’s go.

But here it is not functioning as a separate suggestion. It is the second half of the fixed pattern:

• gidersek gidelim

In other words, it helps form the meaning wherever we may go.

This happens because Turkish uses different endings depending on the person:

• Nereye gidersem gideyim = wherever I go
• Nereye gidersen git = wherever you go
• Nereye gidersek gidelim = wherever we go

For we, gidelim is the natural form used in this pattern.

In this sentence, gidersek gidelim is the standard, natural phrasing.

The -er part gives a more general, open-ended sense, which fits the idea of wherever we go as a general rule. It sounds less like one specific hypothetical event and more like any destination we may choose.

So learners should treat Nereye gidersek gidelim as a common pattern to remember.

Because bakmak takes the dative case in Turkish.

Turkish says:

• bir şeye bakmak = to look at / check something

So you say:

• hava durumuna bakmak = to check the weather / look at the weather forecast

Not:

• hava durumunu bakmak ❌

Also, hava durumu is a noun compound meaning weather or weather forecast. When the dative ending is added, it becomes hava durumuna. The n is just a buffer consonant that appears in this kind of form.

Bakmalıyız breaks down as:

• bak- = look / check
• -malı = must / should
• -yız = we

So it means we should check or we must check.

Depending on context, -malı / -meli can sound like:

• advice: should
• necessity: must / need to

Here it sounds like practical advice or common sense.

It sounds like general advice.

The structure Nereye gidersek gidelim plus bakmalıyız gives the feeling of a general principle:

• whenever we go anywhere, checking the weather is a good idea

So it is less about one exact trip and more about a rule or habit.

Yes. This is a very useful pattern in Turkish.

Examples:

• Ne yaparsak yapalım = no matter what we do
• Kimi seçersek seçelim = no matter whom we choose
• Ne kadar beklersek bekleyelim = no matter how long we wait
• Nerede olursak olalım = wherever we are

A good thing to notice is that the person endings match:

• gidersem gideyim = I
• gidersen git = you
• giderse gitsin = he/she
• gidersek gidelim = we

That matching is an important part of the pattern.