How often does it Rain in beginning of September?

Normally the first weekend after labour day always rains. I only remember this because my town has a small festival and it almost always rains or showers. Last year they moved it to the 15th and it was sunny, hot, and not a cloud in the sky! But then again- we are in Canada. Anything can happen. You should buy a farmers almonac- they are almost always correct

You cannot predict the weather no matter how hard you try. Just be prepared for the good and the bad weather just in case. I would ask the tent people if they have panels that can be put up so it seals the tent off in case of rain and some flooring in case the ground is squishy and damp. If it is only light rain you are already covered so no worries there.

I would just have a backup plan incase and weather is really iffy can change so fast!

It's honestly a 50/50 chance at the point in time. There is nothing you can do about it unfortunately except have a good back up plan! Don't stress it because it's something that you can't control.

Any month has a chance of precipitation! There's not much you can do until closer to the day, and even then all you can do is have a back up plan!

Weather is weather, so we can't really be sure, but if you've looked at averages over the years, I would go with that for an estimate. My sister-in-law and some friends all had weddings on the September long weekend in the last few years, and they have both had wonderful sunny weather for the day-of. I hope it doesn't rain for your big day!