Learn Finnish: Tänään yöllä on kylmä.

Finnish does not have one specific word for tonight. Instead, you combine tänään (today) with the time of day. This phrase literally translates to today at night.

Why is the word yö (night) written as yöllä?

To say when something happens, Finnish often adds the -lla or -llä ending to parts of the day. This is a key part of time expressions. Just like you might specify a clock time, adding -llä tells us at what time the weather is cold. So yö becomes yöllä (at night).

Where is the word for it in on kylmä?

When talking about the weather or temperature in English, we use it as a placeholder, like in it is cold. Finnish does not use these extra subject words, so you just start directly with the verb: on kylmä (is cold).

Does yöllä mean the evening or the late night?

In Finnish, yö strictly refers to the late night, usually when people are sleeping. If you want to say tonight but mean this evening before bed, you would use a different phrase involving the word for evening (ilta).