Cincinnati, Ohio weather in September

Averages from 2021–2025 (150 days of record).

Average high: 80°F
Average low: 61°F
Rainy days: ~8 per month
Total precipitation: 3.5 in
Warmest recorded: 93°F
Coldest recorded: 45°F

Expect September days in Cincinnati, Ohio to top out around 80°F and cool to about 61°F overnight, with roughly 8 days of measurable rain across the month. In recent years September has ranged from 45°F to 93°F.

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Current Cincinnati, Ohio forecast → · Historical data by Open-Meteo (ERA5).