2025 Humboldt Bay Marathon Races

August 10, 2025 - Join us for the 10th Running!

For a current forecast visit the NWS Eureka website

Typical Weather:

Typical Temperatures:

  • The normal high temperature during the first half of August is 64 F (18 C) and the normal low is 53 F (12 C). The high temperature typically occurs between noon and 2 PM.
  • Over the last 40 years, there have only been 11 days when the temperature has gotten over 70 F (21 C) during the first two weeks of August. That's 11 out of 560 days, less than 2%!
  • Note: The weather information on this page is taken from data collected at the Woodley Island station of the National Weather Service. This station is approximately 1 mile from the finish line and very close to the course.

Typical Winds:

All races start and end at the Madaket Plaza, 1st and C Streets in Eureka

  • Average wind speed at 8 AM is 4 MPH, rising slightly by 11 AM to 7 MPH.
  • Winds are typically light and out of the north or northwest.

How it was in 2023?

  • Photos by Yoon Kim click here
  • If you copy and use any of these images, please give credit to the photographers who generously gave their time and energy to make these available. 
  • Marathon Results are HERE
  • Half Marathon Results are HERE
  • Registration is now open at RaceMenu