Humboldt Bay Marathon

Eureka, CA, USA • August 9, 2026

Race Day Weather

54°

65° high

Breezy

Dry

Cool conditions, maintain hydration

Runners will face a temperature rise from 54°F to 64°F during the race. With an average humidity of 86% and dew point at 55°F, runners should adjust their pace to account for the moisture. A steady wind from the WSW at 12 mph will provide a slight challenge, so maintaining hydration is essential.

Race day forecast available in 115 days

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Pre-raceRace windowPost-race

Pace Calculator

Distance: 26.2mi

Target Finish Time

0:00:00

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Pace

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Weather Adj.

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Common Goals:

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. Source

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 65°F and a low of 54°F with a 0% chance of rain. Check our detailed hourly forecast above for the best marathon race plan.

Historical Weather

Based on 9 years of data

Avg Temp

64°F

L:55° H:64°

RunScore

Conditions

Rain Freq

11%

1 of 9 yrs

Wind11mph

Dew56°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

Year	Low / High	Rain	Dew Point
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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