I'd be willing to accept what your owner's manual says. Honda certainly did warm weather testing with that engine and car with the 5W-20. So it should be fine in the warm summer weather.
I might also suggest finding a Honda enthusiast website, I am sure there are millions of them, and try poking around there for an answer. Somebody probably knows for sure. But somehow using 5W-30 or 10W-30 will likely not kill your car.
Stop drop and roll will not save you in hell. --- seen on a church marque in rural Virginia