San Lorenzo River Marathon
Santa Cruz, CA, USA • July 11, 2026
Race Day Weather
56°
72° high
Breezy
Dry
Comfortable temps, big temp swing
Mild 56°F temps at gun time mean comfortable early miles without overheating risk. Temps will climb significantly to 72°F by later miles, so expect fading conditions as the race progresses. Light winds shouldn't be a major factor for pacing. Moderate humidity at 68% is worth noting for effort level, especially in later miles.
Pre-raceRace windowPost-race
Run through 300 foot tall, 1500 year-old Coastal Redwoods, lush stream canyons, open meadows, pine and oak forests, and high dry chaparral-covered ridges. The Half Marathon, 30K, Marathon, and 50K events cross the San Lorenzo River (shown below) multiple times! Source
Historical Weather
Based on 15 years of data
Avg Temp
70°F
L:57° H:71°
RunScore
Conditions
Rain Freq
7%
1 of 15 yrs
Wind10mph
Dew53°F
Temperature History
Range of temperatures during race hours for each year.
Detailed History
| Year | Conditions | Low / High | Rain | Dew Point | Score |
|---|---|---|---|---|---|
2024 |  | 57°/70° | - | 55° | |
2023 | | 55°/74° | - | 56° | |
2022 | | 56°/71° | - | 47° | |
2021 | | 57°/71° | - | 55° | |
2020 | | 56°/68° | - | 54° | |
2019 | | 55°/73° | - | 54° | |
2018 | | 60°/71° | - | 56° | |
2017 | | 58°/70° | - | 58° | |
2016 | | 55°/77° | - | 53° | |
2015 | | 57°/70° | - | 56° | |
2014 | | 57°/69° | - | 50° | |
2013 | | 54°/73° | - | 50° | |
2012 | | 56°/67° | Light | 47° | |
2011 | | 55°/70° | - | 54° | |
2010 | | 61°/75° | - | 54° |