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Santa Cruz, California

Ironman 70.3 Santa Cruz weather

Santa Cruz blends cool coastal air, ocean conditions and potentially windy bike sections.

70.3SeptemberOcean swim

Typical race window

September weather in Santa Cruz, California

Monthly climate normal from 2016-2025 archive data.

September
Air temperature

14°C-25°C

Average wind

13 km/h

Peak daily wind

29 km/h

Wet-day chance

3%

A typical day in September averages 0.2 mm of precipitation, with average gusts around 34 km/h. Treat this as planning context, not a live forecast.

Jan

15°C

Feb

16°C

Mar

16°C

Apr

18°C

May

20°C

Jun

23°C

Jul

24°C

Aug

25°C

Sep

25°C

Oct

23°C

Nov

19°C

Dec

16°C

Swim

Ocean temperature, swell and local beach guidance are key swim factors.

Bike

Coastal wind and changing fog can affect both pacing and visibility.

Run

The run is usually temperate, but sun and wind exposure still matter.

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 Santa Cruz, California prefilled.

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