Jacksonville, Florida weather in September

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

Average high: 85°F
Average low: 72°F
Rainy days: ~17 per month
Total precipitation: 6.9 in
Warmest recorded: 94°F
Coldest recorded: 60°F

Expect September days in Jacksonville, Florida to top out around 85°F and cool to about 72°F overnight, with roughly 17 days of measurable rain across the month. In recent years September has ranged from 60°F to 94°F.

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Current Jacksonville, Florida forecast → · Historical data by Open-Meteo (ERA5).