Buffalo, New York weather in September

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

Average high: 73°F
Average low: 59°F
Rainy days: ~10 per month
Total precipitation: 3.3 in
Warmest recorded: 85°F
Coldest recorded: 44°F

Expect September days in Buffalo, New York to top out around 73°F and cool to about 59°F overnight, with roughly 10 days of measurable rain across the month. In recent years September has ranged from 44°F to 85°F.

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Current Buffalo, New York forecast → · Historical data by Open-Meteo (ERA5).