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 is the time limit for the Humboldt Bay Marathon?

The time limit for the Humboldt Bay Marathon is 6 hours.

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 11 years of data

Avg Temp

59°F

L:55° H:63°

RunScore

Conditions

Rain Freq

1 of 11 yrs

Wind5mph

Dew55°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°/60°	-	54°
2025 Humboldt Bay Marathon Clearing in the afternoon. 2025	52°/65°	-	54°
2024 Humboldt Bay Marathon Cloudy skies throughout the day. 2024	55°/58°	-	55°
2023 Humboldt Bay Marathon Partly cloudy throughout the day. 2023	55°/64°	-	57°
2022 Humboldt Bay Marathon Partly cloudy throughout the day. 2022	58°/63°	-	56°
2021 Humboldt Bay Marathon Partly cloudy throughout the day. 2021	56°/60°	-	56°
2019 Humboldt Bay Marathon Clear conditions throughout the day. 2019	53°/67°	-	55°
2018 Humboldt Bay Marathon Partly cloudy throughout the day. 2018	57°/61°	-	56°
2017 Humboldt Bay Marathon Partly cloudy throughout the day. 2017	54°/67°	-	56°
2016 Humboldt Bay Marathon Cloudy skies throughout the day with morning rain. 2016	51°/59°	Light	53°
2015 Humboldt Bay Marathon Partly cloudy throughout the day. 2015	56°/66°	-	57°