During the 1 trip we took in the middle of Sept., I would describe the weather as sometimes being a bit windy. Looking at past weather patterns for the same time period seems to confirm this as being somewhat normal.

You might consider traveling early in the day, our progress was a bit slow going into the wind. While sitting at the end of the portage from Argo on the north side of crooked, a nearby tree actually fell over while we tried to decide if we should go out or not! I took a quick nap in my chair, and we departed an hour or so later, electing not to set up camp on the portage landing. We didn't have very far to go to catch a break from the wind thankfully, otherwise I would have stayed put.

Probably half of our trip had similar weather, but the souris handled it great.

Lets see IC you were close about the rain on the 6th.  Moose Lake and PP reported close to 9 inches dumped in 24 hours.  AND we still had plenty of rain the rest of the week.
But the real kicker was Thursday. 
We came out of the South Lake channel to North Bay around 2 pm.  Sat on a very windy point till 5pm "gust had to be close to 30 mph".  We finally tucked into a campsite out of the wind.  At 2 am the wind was just as strong as it had been the afternoon before.   
Then about 5 am we broke camp.  I'll add to the fact we broke camp in a snow storm.    Fortunatly the wind had switch and was blowing out of the north.  Making North Bay easier but not peice of cake by any means. 
We planned to camp at Singing Brook last night.  But fishing in the wind was difficult so we opted to get on across Bayley Bay while the wind was in our favor.  Then we just decided to head on in from that point. 
Just walked in the door about an hour ago.  We drove straight thru in 15 1/2 hours. 
By the way a trip report will follow sometime    but it will be a while.  Took over 800 pictures and about 5 hours of HD video.   
It's going to take a little time to sort through the pic/video.  18 gig is a lot of data. 
qp