the weather forecast

[Unregistered Lina]

Hello
I'd like you to check the following sentence.

#1 The weather forecast says that it will rain this evening.

Question 1
Is #1 natural? If not, would you give me other expressions?

Question 2
Which is more appropriate to use in this sentence, "this evening" or "tonight"?

Thank you.

[Marylin]

Hello
I'd like you to check the following sentence.

#1 The weather forecast says that it will rain this evening.

Question 1
Is #1 natural? If not, would you give me other expressions?

Question 2
Which is more appropriate to use in this sentence, "this evening" or "tonight"?

Thank you.

Your sentence is totally correct. If you want to sound more like a weather report on TV you can also say:

Weather forecast calls for rain this evening.
There is rain in the forecast for later on this evening.
Forecast for tonight: rain.

this evening/tonight are both OK.
Rain later tonight.
Rain is anticipated later this evening.
Tonight will bring rain.

etc., etc.