What is the typical weather for Ironman Chattanooga?

Ironman Chattanooga is usually held around September. Chattanooga is usually warm and humid enough that heat management remains central.

How should athletes check Ironman Chattanooga race-day weather?

Use the race-day planner when the forecast window opens, then check official event and local safety guidance before final decisions.

Chattanooga, Tennessee

Ironman Chattanooga weather

Chattanooga is usually warm and humid enough that heat management remains central.

IronmanSeptemberInland-water swim

Typical race window

September weather in Chattanooga, Tennessee

Monthly climate normal from 2016-2025 archive data.

September

Air temperature

18°C-29°C

Average wind

12 km/h

Peak daily wind

37 km/h

Wet-day chance

28%

A typical day in September averages 3.2 mm of precipitation, with average gusts around 30 km/h. Treat this as planning context, not a live forecast.

Jan

10°C

Feb

14°C

Mar

17°C

Apr

21°C

May

26°C

Jun

30°C

Jul

32°C

Aug

31°C

Sep

29°C

Oct

23°C

Nov

16°C

Dec

12°C

Swim

The river swim depends on current, water quality and official race guidance.

Bike

Rolling roads can feel harder when humidity and wind combine.

Run

The run often becomes the heat-management leg, especially in exposed sections.

Live race-day forecast

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This race page stays evergreen. For date, start time and expected segment durations, open the race-day planner with Chattanooga, Tennessee prefilled.

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