Tire pressure will fluctuate throughout the year, especially when it gets hot and cold often, such as the weather of september.
This is why checking your tire pressure is a recommended pre-ride inspection for every time you want to take the bike out.
Check any motorcycle manual, or car manual, and checking tire pressure will be one of the most common things you should be doing.
As far as your worry about the tire now, check for heavy uneven wear and cracks in the rubber.
I personally think the above will be highly unlikely.
If all is good (no cracks or heavy uneven wear) then go out and enjoy the ride.
Remember that with the temperatures of this time of year, a lot of things will fluctuate and its your responsibility to keep checking.
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