It isn’t raining - I wish it would rain. Why not “I wish it was raining”?

Question

I thought I understood the wish clauses but I have just found this example:

Situation: It isn’t raining.
Your wish: I wish it would rain.

Isn't this the situation where I should use the past tense, as this is contrafactual? I have seen many examples with the opposite situation:

It is raining. I wish it was not raining.

Why does the first example then use "would"? Why not

"I wish it was raining"?

EDIT: However, I have also found this sentence in various sources, so I assume it is correct too. But would appreciate some insight from native speakers.

Answer 1

I have seen many examples with the opposite situation:

It is raining. I wish it did not rain.

If you have seen many examples of this then they are all wrong.

It is raining. I wish it wasn't raining.

It rains [every day in Manchester]. I wish it didn't rain [in Manchester]. (You are wishing that it never rained in Manchester - you want Manchester to be like the Sahara Desert)

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Your wish: I wish it would rain. (It is not raining - you want it to start raining in the near future)

Your wish: I wish it was raining. (It is not raining - you wish that it was already raining as you speak)

Answer 2

"I wish it would rain" is not expressing a counterfactual. It is expressing a desire for the future (it would be understood that the speaker wants it to rain in the near future). It is perfectly possible for it to rain in the future.

As you said, “I wish it was raining” is counterfactual; it means "“I wish it was raining right now (but it isn't)". The "now" that the present tense refers to is vague, as usual: it could mean "right now" or it could mean "at this present time period".

Answer 3

Both are correct; they just mean slightly different things. Consider:

1) I wish it would rain -- it's so hot now.
2) I wish it was raining -- I would have slept better last night.

(1) expresses hope for the future. (2) expresses rue (lack of a better word?) about the past.

There's some confusion because most of the time, if there's no rain when you want it, you wish it was raining AND it would rain. For example, (1) could also be:

I wish it was raining -- it's so hot now.

However, changing (2) like this doesn't make sense:

I wish it would rain -- I would have slept better last night.

You might have to go to the beach and not want it to rain anymore.