Those YouGov polls revealed in the last month have shown an average of a 0.63% swing to the yes campaign daily. Let's take the swing from the 15th August poll to the 1st September poll (0.46% daily swing towards yes or yes increase 0.23% per day).
1st Sep - 46.8% yes
2nd - 47.0%
3rd - 47.3%
4th - 47.5%
5th - 47.7%
6th - 48.0%
7th - 48.2%
8th - 48.4%
9th - 48.7%
10th - 48.9%
11th - 49.2%
12th - 49.4%
13th - 49.6%
14th - 49.9%
15th - 50.1%
16th - 50.3%
17th - 50.6%
18th - 50.8%
If the current rate of swing towards the yes campaign continues, the yes campaign will win by 0.8%.
Of course daily swing can rapidly change, but we can hope it doesn't...