The 2026 Humboldt Bay Marathon has concluded.

Humboldt Bay Marathon

Race complete

Eureka, CA, USA · August 9, 2026

55°·60° high·Light·Dry

Race Day Weather

55°at start

62° high

Light

Dry

Cool conditions, steady pace

Runners will face a starting temperature of 55°F, rising to 60°F by the finish. With an average humidity of 90% and a light wind from the SW at 9 mph, moisture levels may feel oppressive. To optimize performance, it's advisable to maintain a steady pace and stay hydrated frequently.

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Distance: 26.2mi

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Race Info

The Humboldt Bay Marathon offers runners a scenic, flat course along Eureka's Waterfront Trails and the Humboldt Bay Trail, with a loop around Klopp Lake in the Arcata Marsh. Starting and finishing at Madaket Plaza in Eureka, the race provides ample aid stations and restroom facilities, ensuring a comfortable experience for participants. The event fosters a vibrant community atmosphere, attracting runners of all levels to enjoy the picturesque coastal views and supportive environment.

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Course Map

FAQ

When is the 2026 Humboldt Bay Marathon?

The 2026 Humboldt Bay Marathon will be held on Sunday August 9, 2026.

Is the Humboldt Bay Marathon a Boston Marathon Qualifier?

Yes, the Humboldt Bay Marathon is an official Boston Marathon qualifier.

What will the weather be like for the 2026 Humboldt Bay Marathon?

The forecast calls for a high of 62°F and a low of 53°F with a 0% chance of rain. Check our detailed hourly forecast above for the best marathon race plan.

Historical Weather

Based on 10 years of data

Avg Temp

64°F

L:55° H:64°

RunScore

Conditions

Rain Freq

10%

1 of 10 yrs

Wind10mph

Dew56°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

Year	Low / High	Rain	Dew Point
2026 Humboldt Bay Marathon Partly cloudy throughout the day. 2026	55°/61°	-	54°
2025 Humboldt Bay Marathon Clearing in the afternoon. 2025	52°/65°	-	54°
2024 Humboldt Bay Marathon Cloudy skies throughout the day. 2024	55°/61°	-	55°
2023 Humboldt Bay Marathon Partly cloudy throughout the day. 2023	55°/65°	-	57°
2022 Humboldt Bay Marathon Partly cloudy throughout the day. 2022	58°/63°	-	56°
2019 Humboldt Bay Marathon Clear conditions throughout the day. 2019	53°/68°	-	55°
2018 Humboldt Bay Marathon Partly cloudy throughout the day. 2018	57°/63°	-	56°
2017 Humboldt Bay Marathon Partly cloudy throughout the day. 2017	54°/68°	-	57°
2016 Humboldt Bay Marathon Cloudy skies throughout the day with morning rain. 2016	51°/60°	Light	53°
2015 Humboldt Bay Marathon Partly cloudy throughout the day. 2015	56°/66°	-	57°

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