Secret City Half Marathon

Oak Ridge, TN, USA · November 14, 2026
partly-cloudy-day44°·59° high·Light·Dry
9
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Race Day Weather

partly-cloudy-day
44°at start
59° high
Light
Dry

Cool start, mild finish

Runners will face a temperature range from 40°F at the start to 59°F by the finish, with average humidity at 55%. Wind will be light from the SSW at 5 mph, making it a non-factor. With cool conditions, maintaining a steady pace throughout is advisable, avoiding overheating as temperatures rise.

Race day forecast available in 64 days
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Pace Calculator

Distance: 13.1mi
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Race Info

The Secret City Half Marathon and 5K takes place each November in Oak Ridge, Tennessee, a city built in secrecy during World War II for the Manhattan Project. Both courses start and finish at the Melton Lake Park peninsula. The half marathon runs along Melton Lake, past an operational quarry, and down a tree-lined private road before returning along the water to the finish. The 5K stays along the Melton Lake walking trail out to Elza Gate Park and back.

Area Map

Course Map

FAQ

When is the 2026 Secret City Half Marathon?

The 2026 Secret City Half Marathon will be held on Saturday November 14, 2026.

What will the weather be like for the 2026 Secret City Half Marathon?

The forecast calls for a high of 61°F and a low of 41°F with a 10% chance of rain.

Historical Weather

Based on 2 years of data
Avg Temp
61°F
L:48° H:61°
RunScore
7
Conditions
Rain Freq
0%
0 of 2 yrs
Wind10mph
Dew45°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

YearConditionsLow / HighRainScoreResults
2025
partly-cloudy-day
52°/71°-
8
2024
cloudy
45°/50°-
8