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We tried seeding in September at home - it came up well, and the grass had time to get established before the cold. The main thing is that there's still rain and the soil doesn't dry out, otherwise the seeds just won't germinate. What's the climate like in your region, by the way? If autumn is warm and humid, then September is ideal, but if it's already getting cold and there's no rain, it's better to wait until spring.
the main thing is don't sow too late. if you miss the window, the grass won't root properly and will just freeze. in the central regions, september is already the cutoff - anything later is risky. your climate might be different, but generally the earlier in the season, the better your chances.
moisture really is a problem. but there's another thing people often overlook - soil prep. you can't just throw seeds in the ground; you need to dig it over, pull out weeds, maybe add peat or compost. if you skip that, even with good moisture the seedlings will be weak. summer weeds are still active in september, they'll easily choke out young grass.
if the soil's ready and rain's forecast - go for it. but check the forecast a month ahead. one rain isn't enough; you need consistent moisture. a dried-out lawn in a few days of fall is really hard to save after that.
Fall lawn seeding works, but it all depends on how far you are from the first frost! If your region stays warm through the end of October, now is the perfect time - the soil is still warm and there's plenty of moisture in the air. The key thing is don't skimp on water for the first two weeks after seeding, especially if rain is scarce!
Lifehack: before seeding, poke the soil with a fork 5-7 centimeters deep so the seeds make better contact with moist soil at depth instead of just sitting on the surface. And right after, roll the area with something heavy - it'll speed up germination!
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