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On ne doit jamais se fier à la météo.

On ne doit jamais se fier à la météo.
We must never trust the weather forecast.
From Lesson 183:Reported speech: future to conditional·French

Questions & Answers about On ne doit jamais se fier à la météo.

Why is se fier reflexive here?
In French, the verb se fier is inherently reflexive when it means 'to trust' or 'to rely on'. You must use it with a reflexive pronoun (like me, te, or se) that matches the subject.
Why do we use à after se fier?
The verb se fier requires the preposition à when you are specifying who or what is being trusted. So 'to trust the weather forecast' becomes se fier à la météo.
How does the negative ne ... jamais work with two verbs in this sentence?
When a sentence has a conjugated verb followed by an infinitive, the negative pieces like ne and jamais go around the conjugated verb. Here, they sandwich doit, leaving the infinitive se fier outside the negative structure.
Why does the translation say 'We must' when the sentence starts with On?
While on literally means 'one', in everyday French it is the most common way to say 'we'. It is also used to make broad statements about people in general, which fits perfectly here as a general rule about the weather.

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