Humboldt Bay Half Marathon

Eureka, CA, USA · August 8, 2027·
partly-cloudy-day57°·64° high·Light·Dry
7
Register

Humboldt Bay Half Marathon race day weather

partly-cloudy-day
57°at start
72° high
Breezy
Dry
Your goal
0:00:00

Comfortable temps, warming through the race

Mild 57°F temps at gun time mean comfortable early miles without overheating risk. Temperatures rising to 72°F through the course will gradually increase perceived effort in the second half. Light winds shouldn't be a major factor for pacing. Moderate humidity at 68% is worth noting for effort level, especially in later miles.

Race day forecast available in 260 days
partly-cloudy-night9
partly-cloudy-day9
partly-cloudy-day8
partly-cloudy-day7
partly-cloudy-day6
clear-day5
clear-day5
clear-day5
clear-day4
clear-day4
clear-day5

Pace Calculator

13.1mi
0:00:00
HH:MM:SS
Pace
—

Enter a finish time to see what race day does to it.

Common Goals:

Get forecast alerts for Humboldt Bay Half Marathon

We'll text or email you when the forecast shifts — so you can adjust gear, pacing, and strategy. Max one per day.

About the Humboldt Bay Half Marathon

The Humboldt Bay Half Marathon is a USATF-certified 13.1-mile course on the Eureka Waterfront Trail and the Humboldt Bay Trail. It starts at Madaket Plaza at 1st and C Streets, climbs onto the trail under the bridge and runs out and back toward Arcata along the edge of the bay. The route finishes along the Eureka Boardwalk to the finish arch in the plaza. The course is nearly flat, topping out at about 20 feet above sea level, and is held on the second Sunday in August.

Race weekend

Sunday, August 8
7:00 AMMarathon (26.2 mi)
8:00 AMHalf Marathon (13.1 mi)
8:20 AM5K (3.1 mi)
Area Map
Course Map

Humboldt Bay Half Marathon FAQ

When is the 2027 Humboldt Bay Half Marathon?

The 2027 Humboldt Bay Half Marathon will be held on Sunday August 8, 2027.

What will the weather be like for the 2027 Humboldt Bay Half Marathon?

The forecast calls for a high of 74°F and a low of 54°F with a 0% chance of rain. Check our detailed hourly forecast above for the best half marathon race plan.

What is the weather usually like for the Humboldt Bay Half Marathon?

Over the 11 years racecast.io has race-day weather for (2015 to 2026), it averaged 56°F at the start and 59°F by a typical finish. It has not rained during race hours in any of those years.

What was the hottest Humboldt Bay Half Marathon?

Of the 11 years on record, 2015 was the warmest, reaching 63°F during race hours. The coldest start was 2016, at 51°F.

What was the windiest Humboldt Bay Half Marathon?

Of the 11 years on record, 2021 was the windiest, with wind averaging 6 mph during race hours. The calmest was 2016, at 1 mph.

Humboldt Bay Half Marathon weather history

Based on 11 years of data
Avg Temp
57°F
L:56° H:59°
RunScore
7
Conditions
Rain Freq
0%
0 of 11 yrs
Wind3mph
Dew55°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

YearConditionsLow / HighRainScoreResults
2026
cloudy
55°/56°-
8
2025
cloudy
53°/56°-
8
2024
cloudy
55°/56°-
8
2023
cloudy
56°/61°-
7
2022
cloudy
58°/60°-
7
2021
cloudy
56°/58°-
7
2019
cloudy
57°/63°-
7
2018
cloudy
57°/58°-
7
2017
partly-cloudy-day
57°/62°-
7
2016
fog
51°/54°-
9
2015
partly-cloudy-day
59°/63°-
7