Learn Finnish: Perjantaina on kylmä tuuli ja viileä sää. - On Friday there is a cold wind and cool weather.

The base word for Friday is perjantai. Adding the ending -na changes it to mean 'on Friday'. This ending is used with all days of the week when you want to say that something happens on that specific day.

Where is the word for 'there' in the Finnish sentence?

Finnish doesn't use a filler word like 'there'. To say 'there is' or 'there are', you usually start the sentence with a time or place (like perjantaina), follow it with the verb on (is), and then state what exists. Literally, it translates to 'On Friday is cold wind'.

What is the difference between kylmä and viileä?

Kylmä means 'cold', while viileä means 'cool' or 'chilly'. Just like in English, kylmä describes a noticeably lower and harsher temperature than viileä.

Can I use the word ilma instead of sää here?

Yes! While ilma literally means 'air', it is very commonly used in Finnish to talk about the weather. Saying viileä ilma would mean the exact same thing as viileä sää in this context.