In reply to doubledareya:
As has been mentioned, there are a relatively large number of sport climbing venues in NE Scotland, with Kirrie Hill (
http://www.ukclimbing.com/logbook/crag.php?id=3904) the most popular (it's a quick-drying suntrap with a lot of lower grade routes). The rock isn't the best and the routes are short, but if you're happy with quantity over quality then you'll have an enjoyable day there. The other crags are grotty quarries or will have access restrictions when you'll be there. There are some scattered sport climbing crags on the coast around Aberdeen, but they tend to be in the higher grades.
Another option to consider is the Inverness area, with Moy Rock (
http://www.ukclimbing.com/logbook/crag.php?id=3457) in particular being worthwhile (again, a south facing suntrap but a big bigger than Kirrie), and other sport climbing options nearby including Creag Bheag, Silver Rock and the Camel (though this is probably too hard for the grade range you're after).
The Gairloch area has a few options too if you want to combine west coast scenery with sport climbing - Creag nan Luch, Kuhjo Crag and Goat Crag giving you some choice, though with few options in the lower grades. Midges might be a problem, but they're usually in decline by September.
There's not that much on offer around Loch Lomond as far as sport climbing goes but you might consider the Crieff area (Lower Glen Lednock, Dunira, Weem and Benny Beg). There are some parking/access issues around Glen Lednock and Benny Beg is hardly an inspiring crag, but again, it's still an option for you.
Hope you get the weather - if it's wet then Ratho is worth a visit but I would hardly describe it as the best place to sport climb in the 5s and 6s in Scotland, and there are obviously plenty of other indoor walls to let you get something out of a rainy day.