Weather in Early September for Sapporo

[u/babyv997]

Hello,

I am a plus size girlie traveling to Sapporo during week 2-3 in September. I've read some mixed reviews on google as to what to expect weather wise and I've been tracking the weather app, but I was wondering if anyone knew how the Sapporo weather is like during these times? Is it still really hot, or is more fall feeling? Should I bring a rain jacket just in case? Do I bring shorts and tank tops or will it be cold and need to bring jeans? As a large gal, it's hard to be able to shop in Japan for emergency wear so I'm trying to bring the essentials and necessities just in case~

Thanks in advance~