With that type of training, you are not ready going to be ready to run a marathon well. Could you complete it? That is highly probable if you are a determined individual and are willing to run sufficiently slowly, but why do you want to do that?
Sometimes we make commitments which we want to keep. If this is a charity run and there are lots of reasons for doing the 26.2, do it. Just be cautious knowing that you will hurt afterwards and that to do it you will need to be very cautious for the first 22 or 23 miles.
On the other hand, if you want to have a first marathon which is memorable for the right reasons, consider trading down this time and doing the half instead. Use the following months to ramp up your mileage and run a first marathon next year.
Most people who end up running marathons - note the plural - wait until they are ready to run one, and then keep going. Of course, if you are determined, you could complete on on October 15th, and then commit to learn from your mistakes and do it right the next time. Good luck with whichever choice you make. Let us know how it goes.
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