天気予報はあてにならないって英語でなんて言うの？

rely on... 「信頼する、頼みにする」 trust 「信用する」 count on 「頼る」 などの表現を使って表すのはいかがでしょう。 We can't really rely on weather forecasts. We shouldn't count on weather forecasts. などもいいでしょう。

この文は、直訳すると 「天気予報ってなんでいつも間違ってるの？」 です。 (weather forecast = 天気予報、wrong = 間違い) 質問の形を取っていますが、実際に誰かに質問しているわけではなく、暗に「天気予報ってあてにならないよね」ということをほのめかす方法です。 天気予報では晴れだったのに、実際には雨に降られてしまって、 「ほんと、天気予報ってあてにならない！」 と不満を表したい場合、上記英訳のように言うといいでしょう。 質問の形にせずに、 Weather forecasts are always wrong! 「天気予報はいつも間違ってる」 Weather forecasts are never right! 「天気予報が正しいことがない」 と言ってもいいでしょう。 これら３つの文を言うときに、不満感たっぷりな口調で言えば、質問者さんのいう「迷惑」感が出ると思いますよ。

Stating that the weather forecast is not accurate or reliable are simple ways to express that you can't rely on the weather forecast to be correct all of the time. Here is an example: The weather forecast is not accurate, it said that it was going to rain yesterday, but it didn't rain at all yesterday.

We use "weather forecast" when we are referring to the weather prediction made by scientists. We say "reliable source" when we want to say that the information that they give is to be trusted. So in the first sentence when you say that you do not believe that the weather forecast is reliable, you are saying that you do not trust the weather predictions. The second sentence really just means the same as the first, just used different wording to get the same point across. Hope this helps! Thank you for your question.

In some countries, it is impossible to rely on the weather report. It is not very reliable because sometimes it changes very quickly without warning. Irish weather is famous for being like this. To rely on something or someone means to depend on something or someone with all your trust.