It has been two or three years since I've done San Antonio, but I've started it four times and finished three times. The exception had nothing to do with the weather - don't start a marathon if you're injured or the odds of a DNF are high.
The first time down there for me was a classic crash and burn, aggravated by the heat and humidity. The second half took an extra half hour. The next time I ran it, I took over half an hour of that earlier time, and I wasn't that much more fit. You need to be prepared to wake up, consider the weather and adjust appropriately. On good days, it's great. At other times, it can be hot and humid, at least by Canadian standards. On the other hand, you're planning to run in Texas in November so you know the weather can be variable.
San Antonio has a good course and it's fun city for tourists. I hope the noise from the Rock & Roll format is not too off-putting. I prefer smaller venues so I'm not certain that I will be back any time soon, but it isn't the weather which keeps me away.
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