Cincinnati weather in September

Cincinnati's forum rates September as one of the better months — drier than the rainy stretch from spring through June, past the worst of summer's heat. Regulars are candid that the city's weather stays genuinely unpredictable regardless of season, joking about seeing all four in a single week.

Regulars share a local saying that sums up planning here: if you don't like the weather, wait 15 minutes and it's sure to change - advice regulars apply to this month as much as any other, packing for both a sudden downpour and a stretch of sticky heat within the same trip. Our row backs the hot, humid read, 29.1C reading as a hot 32C, over 16.9C nights, with 88.1mm of rain across 8.2 days and humidity at 72 percent. Regulars are consistent that a quick-drying layer beats a heavy raincoat, since storms here tend to blow through fast rather than settle in for the day. The record: 11.3 hours of sun, a 12.1 kph wind and AQI 61.

Regulars describe spring rain typically holding on into this month before a drier stretch sets in through the rest of summer, with a well-worn local saying that if you don't like the weather, wait fifteen minutes and it's sure to change. Our row backs the transitional, still-wet read, 28.1C reading as a real 30C, over 15.1C nights, with 102.3mm of rain across 8.9 days. Regulars pushing later into late June and early July are more confident calling it hot and humid outright, so this month sits at the hinge between changeable spring and settled summer heat rather than fully inside either. The record: humidity 70 percent, 11.5 hours of sun, a 14.5 kph wind and AQI 67.

Regulars rate October as one of the drier and milder months here - our row backs it at 66.2mm across 7.7 days - while quoting the local line that if you do not like the weather you should wait fifteen minutes. What that means in practice is layers, with a light sweater for the mornings and evenings: 20.3C days fall to 6.9C nights that feel like 5C. The colour follows the cold, starting around the third week of the month as the overnight temperatures drop, so the back half is the scenic half. The record: humidity 68 percent, 8 hours of sun, a 15.8 kph wind and AQI 35.

A lifelong Cincinnatian's advice for May is to be prepared for all kinds of weather at all times, and the local saying they quote is that if you do not like the weather, wait fifteen minutes. The spread they describe is real: the 70s Fahrenheit and sunny is about as likely as the 40s or 50s and raining, with the average around 21C by day and 10C at night on the 1st. Our row's 23.6C over 10.8C is the month's middle, and the wet half of their prediction is the part the figures back hardest - 119.7mm across 11.8 precipitation days, because spring here stays rainy until the end of June and only then dries out. A medium jacket, heavier than a windbreaker, is what they pack. The record: humidity 73 percent, 9.7 hours of sun and AQI 51.