Looking on the internet deeply has found these results:

Although it was pouring is the most popular phrase on the web.

Although it was poring with rain 10 results on the web	Although it was pouring 12,000 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.	Although it was pouring rain, Gary still insisted on riding his bike to school. 22. Barb smiled with pride as her daughter played a piece by John Dowland on her. Although it was pouring with rain, Gagarin insisted the car hood remain back. Through his interpreter, he told the driver, "If all these people have turned out to�... Nov 18, 2013 ... Although it was pouring rain, we were able to get close to large chimpanzees. One big guy unhappy to see us kept tossing mud in our direction. Although it was pouring rain, it was still so beautiful! After dinner, he asked me to walk with him along the pier. I really didn't want to. It was pouring and I was cold�...

Although it was poring with rain

10 results on the web

Although it was pouring

12,000 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.

Although it was pouring rain, Gary still insisted on riding his bike to school. 22. Barb smiled with pride as her daughter played a piece by John Dowland on her.
Although it was pouring with rain, Gagarin insisted the car hood remain back. Through his interpreter, he told the driver, "If all these people have turned out to�...
Nov 18, 2013 ... Although it was pouring rain, we were able to get close to large chimpanzees. One big guy unhappy to see us kept tossing mud in our direction.
Although it was pouring rain, it was still so beautiful! After dinner, he asked me to walk with him along the pier. I really didn't want to. It was pouring and I was cold�...