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The way to sa this is:

It has been raining all day.

One continuing event

We use the present perfect continuous for a single activity that began at a point in the past and is still continuing:

I’ve been reading your book – it’s great. (I’m still reading it.)

He’s been living in the village since 1995. (He is still living in the village.)

She has been writing her autobiography since 1987.

https://dictionary.cambridge.org/us/grammar/british-grammar/present-perfect-continuous-i-have-been-working

The way to say this is:

It has been raining all day.

One continuing event

We use the present perfect continuous for a single activity that began at a point in the past and is still continuing:

I’ve been reading your book – it’s great. (I’m still reading it.)

He’s been living in the village since 1995. (He is still living in the village.)

She has been writing her autobiography since 1987.

https://dictionary.cambridge.org/us/grammar/british-grammar/present-perfect-continuous-i-have-been-working

It has been raining all day.

One continuing event

We use the present perfect continuous for a single activity that began at a point in the past and is still continuing:

I’ve been reading your book – it’s great. (I’m still reading it.)

He’s been living in the village since 1995. (He is still living in the village.)

She has been writing her autobiography since 1987.

https://dictionary.cambridge.org/us/grammar/british-grammar/present-perfect-continuous-i-have-been-working

The way to sa this is:

It has been raining all day.

One continuing event

We use the present perfect continuous for a single activity that began at a point in the past and is still continuing:

I’ve been reading your book – it’s great. (I’m still reading it.)

He’s been living in the village since 1995. (He is still living in the village.)

She has been writing her autobiography since 1987.

https://dictionary.cambridge.org/us/grammar/british-grammar/present-perfect-continuous-i-have-been-working

It has been raining all day.

One continuing event

We use the present perfect continuous for a single activity that began at a point in the past and is still continuing:

I’ve been reading your book – it’s great. (I’m still reading it.)

He’s been living in the village since 1995. (He is still living in the village.)

She has been writing her autobiography since 1987.

It has been raining all day.

One continuing event

We use the present perfect continuous for a single activity that began at a point in the past and is still continuing:

I’ve been reading your book – it’s great. (I’m still reading it.)

He’s been living in the village since 1995. (He is still living in the village.)

She has been writing her autobiography since 1987.

https://dictionary.cambridge.org/us/grammar/british-grammar/present-perfect-continuous-i-have-been-working