Do I need a jacket in Jacksonville in September?

Probably not for daytime — highs average around 87°F. A light layer for air-conditioned interiors is enough.

How hot does Jacksonville get in September?

Daytime highs average around 87°F. Lean toward breathable fabrics like cotton and linen, and bring sun protection.

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Rayon or Viscose tops
These fabrics drape well and stay cool in Jacksonville's 87°F September humidity near Riverside.
Cotton chinos
A good weight for 70°F September nights when the humidity still lingers in downtown Jacksonville.
Swimwear
The Atlantic water is at its warmest in September, making 87°F days perfect for Jacksonville Beach.
Lightweight cardigan
While it's 87°F outside, Jacksonville's indoor AC is often cranked high to combat September humidity.

Comfortable loafers
Great for the 12 rain days in September where you want a closed shoe that still breathes at 87°F.
Canvas sneakers
Perfect for a 87°F walk through the historic Avondale neighborhood in September.
Beach sandals
Still essential for 87°F beach days at Neptune Beach in September.

Anti-humidity hair spray
Essential for the 12 rain days in September when Jacksonville's air is thick with moisture.
Waterproof watch
Useful for the 12 rain days in September when you're likely to get caught in a sudden Jacksonville shower.
Hat with neck flap
Provides extra protection during 87°F fishing trips on the St. Johns River.

Compact travel umbrella
With 12 rain days in September, a small umbrella is a must-carry for any Jacksonville sightseeing at 87°F.
Lightweight rain mac
A breathable rain layer is perfect for navigating the 87°F tropical moisture of a Jacksonville September.
Zip-lock bags or dry pouch
Jacksonville's September averages 12 rain days with 87°F heat — small waterproof pouches keep electronics and documents dry during sudden St. Johns River-area showers.

September is a great month for surfing at Jacksonville Beach as tropical swells begin to arrive.

The 12 rain days in September often include longer-lasting tropical showers compared to June's brief storms.

Evening temperatures of 70°F are pleasant, but the St. Johns River breeze can still make them feel humid.

Probably not for daytime — highs average around 87°F. A light layer for air-conditioned interiors is enough.
The 12 rain days in September often include longer-lasting tropical showers compared to June's brief storms.
Daytime highs average around 87°F. Lean toward breathable fabrics like cotton and linen, and bring sun protection.

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