Ironman California — Weather Guide
Historical weather data for race day in 10月. Use this to plan your race strategy across all three disciplines.
20°C
Air Temp
14°–23°C
17°C
Water Temp
river
45%
Humidity
30%
Rain Chance
20 km/h
Wind
10月
Race Month
Saturday
Typical: 20°C, 45% humidity.
🏊 Swim Conditions
Water Temperature
17°C
Cool water — a good wetsuit makes a significant difference.
Wetsuit Strategy
conditional
Conditional on race-day water temp. Threshold: 24.5°C. Bring your wetsuit and decide on race morning.
Water Conditions
river — variable
River swim — current direction matters. Check race briefing for direction and expected current strength.
🚴 Bike Conditions
Wind Impact
20 km/h
Light winds — standard conditions. Maintain steady effort.
Temperature on the Bike
20°C (45% humidity)
Comfortable for riding. Standard hydration plan.
Bike Course Profile
flat · ↑400m
Flat course — maintain a consistent aero position and power output.
🏃 Run Conditions
Heat & Humidity Impact
Good running conditions (20°C). Standard pacing strategy. Drink to thirst.
Run Course Terrain
road surface, flat profile with ↑38m of elevation gain.
💧 Hydration & Nutrition Strategy
Before the Race
Normal hydration. Drink to thirst in the 24–48 hours before. Avoid over-hydrating.
On the Bike
Aim for 500–750ml per hour. Start fueling early — 60–90g carbs/hour from gels, bars, and sports drink.
On the Run
Drink at aid stations every 2–3km. Continue 30–60g carbs/hour. Your gut may be sensitive after the bike — use what you practiced in training.
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