I’ve been to Kauai about 20 times, usually 2 weeks. Always stay on the North Shore. Only once was rain an issue (in April)
i always recommend the North Shore for stays from May 15 to Oct 15, which is when I go 95% of the time. For me, it’s what makes Kauai special.
Now that I’m a Hyatt person, I might start with a few days at the GH. But by day 3, I want the lush beauty of the north shore.
A blanket recommendation to never stay there is a disservice.