Wrote a haiku in my Japanese class and I want some feedback on it

In my Japanese class today, my professor wanted us to all write haikus using specific kanji as a way to practice using kanji in different contexts/readings. I chose 雨 and I don’t expect it to be grammatically correct (she gave us 5 minutes to write it), but I do have some questions about the syllables and my usage of one particular word. (This is also my first haiku in Japanese, so I don’t think I have the hang of it just yet)

雨宿り
今日は雨天
もっと雨

(Which I intended to mean:
Taking shelter from the rain
Today, it is rainy weather
More rain)

The first thing I wanna know is if my use of 雨宿り is correct; the dictionary I use only lists it as meaning “taking shelter from rain”, but it also said it is a suru verb and I didn’t know how much it changes the meaning by not having する. I also was wondering if the second line (今日は雨天) has the correct number of syllables or not. The guide my professor gave us on it was very short and unclear, so I’m not sure if it’s 6 or 7 that I have. If it is 6, would 今日は雨天だ be a better fit? Thanks!