今にも一雨降りそうだ。

tbd

There is every sign of rain.

今にも一雨きそうだ。

tbd

It is threatening to rain.

一雨きそうですね。

tbd

The sky looks threatening.

It looks like it's going to rain.

ひと雨来そうだ。

tbd

It looks as if it is going to rain.

It looks like there's going to be some rain.

It looks as if it's going to rain.

この空模様だと、もしかしたら午後にはひと雨降るかもしれません。

tbd

From the look of the sky, it may rain in the afternoon.

この空模様から察すると、日暮れ前にひょっとしたら一雨降るかも知れません。

tbd

Judging from the look of the sky, we might have a shower before nightfall.