Looking on the internet deeply has found these results:

I thought it might rain. is the most popular phrase on the web.

I thought rain could come. 10 results on the web	I thought it might rain. 1404 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
It doesn't look like this phrase is very popular! The search could not find any examples on the internet.	the story of my life in trying times. just add water, stir in lime. how the west was won and where it got us. ahhhh. I didn't wear glasses cause I thought it might rain . May 23, 2015 ... John Seale said: �I thought it might rain and so I wanted to get a quick lap in early on. Then it rained and the track was atrocious, really slippery. Oct 7, 2010 ... While it's technically correct to use might for the past tense of both, only the possibility sense works well: "I thought it might rain later" is identical�... May 12, 2015 ... (I thought it might rain. There was not a cloud in the sky.) It was, however, a lovely evening and night, and we continued west to our destination�...

I thought rain could come.

10 results on the web

I thought it might rain.

1404 results on the web

More popular!

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

the story of my life in trying times. just add water, stir in lime. how the west was won and where it got us. ahhhh. I didn't wear glasses cause I thought it might rain .
May 23, 2015 ... John Seale said: �I thought it might rain and so I wanted to get a quick lap in early on. Then it rained and the track was atrocious, really slippery.
Oct 7, 2010 ... While it's technically correct to use might for the past tense of both, only the possibility sense works well: "I thought it might rain later" is identical�...
May 12, 2015 ... (I thought it might rain. There was not a cloud in the sky.) It was, however, a lovely evening and night, and we continued west to our destination�...