Napa Valley Marathon

Napa, CA, USA · March 7, 2027

47°·62° high·Light·Dry

Weather

Race Day Weather

47°at start

64° high

Light

Dry

Cool conditions, steady wind shifts

Runners will face a cool start at 47°F, gradually warming to 63°F by race end. Wind will peak at 7 mph from the west, with gusts reaching 18 mph, providing a tailwind in the first three miles and again at mile nine. With average humidity at 60%, pacing should remain steady, especially during the crosswind segments from miles 4-8 and 10-27, to avoid unnecessary fatigue.

Race day forecast available in 278 days

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Distance: 26.2mi

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Race Info

The Napa Valley Marathon is an annual marathon, half marathon, and 5K in Napa County, California. The USATF-certified marathon course begins in Calistoga at the northwestern tip of Napa County, and then traverses the Silverado Trail, ending in downtown Napa. The race's course is primarily rolling hills or flat as it moves through rural California Wine Country. The Napa Valley Marathon has been run in March since 1979, accepts only about 3,000 runners, and is widely considered one of the most scenic marathons in the United States. The men's and women's winners of the race win their weight in wine. Wikipedia

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FAQ

When is the 2027 Napa Valley Marathon?

The 2027 Napa Valley Marathon will be held on Sunday March 7, 2027.

Is the Napa Valley Marathon a Boston Marathon Qualifier?

Yes, the Napa Valley Marathon is an official Boston Marathon qualifier.

What is the time limit for the Napa Valley Marathon?

The time limit for the Napa Valley Marathon is 6 hours.

What will the weather be like for the 2027 Napa Valley Marathon?

The forecast calls for a high of 66°F and a low of 47°F with a 10% chance of rain. Check our detailed hourly forecast above for the best marathon race plan.

Historical Weather

Based on 26 years of data

Avg Temp

59°F

L:48° H:59°

RunScore

Conditions

Rain Freq

50%

13 of 26 yrs

Wind12mph

Dew45°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

Year	Low / High	Rain	Dew Point
2026 Napa Valley Marathon Partly cloudy throughout the day. 2026	56°/63°	-	54°
2025 Napa Valley Marathon Partly cloudy throughout the day with early morning rain. 2025	50°/58°	-	44°
2024 Napa Valley Marathon Partly cloudy throughout the day with a chance of rain throughout the day. 2024	45°/53°	Light	42°
2023 Napa Valley Marathon Partly cloudy throughout the day with a chance of rain throughout the day. 2023	46°/53°	Light	37°
2022 Napa Valley Marathon Clear conditions throughout the day. 2022	40°/60°	-	40°
2020 Napa Valley Marathon Partly cloudy throughout the day. 2020	46°/59°	-	35°
2019 Napa Valley Marathon Partly cloudy throughout the day with afternoon rain. 2019	54°/58°	Light	53°
2018 Napa Valley Marathon Clearing in the afternoon. 2018	34°/53°	-	38°
2017 Napa Valley Marathon Partly cloudy throughout the day with a chance of rain throughout the day. 2017	44°/51°	Light	38°
2016 Napa Valley Marathon Partly cloudy throughout the day with a chance of rain throughout the day. 2016	52°/59°	Light	47°
2015 Napa Valley Marathon Clear conditions throughout the day. 2015	43°/60°	-	39°
2014 Napa Valley Marathon Partly cloudy throughout the day with afternoon rain. 2014	53°/59°	Light	53°
2013 Napa Valley Marathon Clearing in the afternoon. 2013	52°/65°	-	49°
2012 Napa Valley Marathon Clear conditions throughout the day. 2012	48°/71°	-	45°
2011 Napa Valley Marathon Cloudy skies throughout the day with a chance of rain throughout the day. 2011	54°/57°	Light	53°
2010 Napa Valley Marathon Clear conditions throughout the day. 2010	47°/61°	-	49°
2009 Napa Valley Marathon Cloudy skies throughout the day with a chance of rain throughout the day. 2009	52°/55°	Light	52°
2008 Napa Valley Marathon Clear conditions throughout the day with a chance of rain throughout the day. 2008	52°/66°	Light	25°
2007 Napa Valley Marathon Partly cloudy throughout the day. 2007	52°/66°	-	46°
2006 Napa Valley Marathon Cloudy skies throughout the day with rain. 2006	49°/55°	Light	41°
2005 Napa Valley Marathon Clear conditions throughout the day with morning rain. 2005	46°/67°	Light	52°
2004 Napa Valley Marathon Clear conditions throughout the day with early morning rain. 2004	48°/69°	-	52°
2003 Napa Valley Marathon Clear conditions throughout the day with morning rain. 2003	42°/60°	-	43°
2002 Napa Valley Marathon Partly cloudy throughout the day with rain. 2002	46°/57°	-	45°
2001 Napa Valley Marathon Cloudy skies throughout the day with a chance of rain throughout the day. 2001	52°/57°	Light	49°
2000 Napa Valley Marathon Cloudy skies throughout the day with a chance of rain throughout the day. 2000	47°/48°	Light	44°