The numbers will start dropping off about now because the dung beetles should be breeding up. The Ag dept was looking into a new species which doesn't die off in winter but I haven't heard what the result was.
If you think they're bad here, try a trip to the country.

Walking around the paddocks will give you about a kilo of flies riding on your back.

They make intermittent trips to paddle in your eyes, ears, up your nose, in your mouth,,.... and anywhere else that might be uncovered

.
When they get tired of that they just ride around on your back. It's all top entertainment if you're a fly.