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Historical weather

Historical Race Day Weather for the Napa Valley Marathon

See historical race day weather for the Napa Valley Marathon, including start temperature, humidity, wind, race day temperatures, PR score, and course score.

Weather Averages for Last 15 Years

Race day snapshot

Mostly Cloudy

Most common race morning weather across the last 15 years.

Start Line Conditions

Start Temp 45°F 7°C

Start Humidity 88% Humidity

Wind W 4 mph

Race day high 60°F 16°C

Race day low 43°F 6°C

PR Score 99.49 Weather-influenced race day scoring

Course Score 99.75 Course-only Score

Race Day Weather by Year

Most recent years appear first so you can quickly compare start conditions, temperatures, wind, and scores across different editions of the race.

March 1, 2026

Race day snapshot

Partially cloudy

Start Line Conditions

Start Temp 53°F 12°C

Start Humidity 100% Humidity

Wind SSW 1 mph Wind

Race day high 63°F 17°C

Race day low 53°F 12°C

PR Score 98.67 Normal score 99.75