Weather: San Francisco Half Marathon
Historical weather data for race day in April. Use this to plan your race strategy, clothing, and hydration.
14°C
Temperature
Range: 11°C – 17°C
68%
Humidity
Moderate
15%
Rain Chance
Low chance of rain
April
Typical race month
Usually on a Sunday
Conditions
Cool spring weather with mild temperatures and clear skies typical of San Francisco's April climate. Occasional fog and wind from the Bay are possible; layers are recommended.
What to Wear
Singlet or short sleeve
Ideal racing temperatures
Hydration Strategy
Before the Race
Normal hydration. Drink to thirst in the 24 hours before. Avoid over-hydrating.
During the Race
Drink at aid stations every 3-4km. Alternate water and sports drink.
After the Race
Rehydrate within 30 minutes of finishing. A drink with electrolytes and some protein helps recovery.
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