Chelmsford Half Marathon

Chelmsford, England, UK · October 10, 2027·
partly-cloudy-day55°·57° high·Breezy·Dry
8
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Race Day Weather

partly-cloudy-day
55°at start
60° high
Breezy
Dry
Your goal
0:00:00

Comfortable temps, moderate wind

Mild 55°F temps at gun time mean comfortable early miles without overheating risk. Moderate winds around 14mph may affect pacing on open sections of the course. Moderate humidity at 79% is worth noting for effort level, especially in later miles.

Race day forecast available in 324 days
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Pace Calculator

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Race Plan

Get your personalized Chelmsford Half Marathon race plan

A mile-by-mile breakdown of where your time goes, weather-adjusted splits, fueling timeline with aid stations, packing checklist, carb tracker, spectator guide, all built around your goal and race-day conditions.

Race Pace
Weather Splits
Nutrition
Gear & Packing
T-Minus
Carb Tracker
Spectator Guide
Race Band

Race Info

The Chelmsford Half Marathon starts and finishes in Central Park, Chelmsford, on the same morning as the marathon. Runners share the marathon's opening route through West Park and past Writtle University toward Roxwell, then turn back for Central Park just past the six-mile mark, while the marathon continues on into the Essex countryside. The out-and-back course runs on quiet, undulating country lanes through the Writtle and Roxwell area.

Race weekend

Sunday, October 10
9:00 AMMarathon (26.2 mi)
9:30 AMHalf Marathon (13.1 mi)

FAQ

When is the 2027 Chelmsford Half Marathon?

The 2027 Chelmsford Half Marathon will be held on Sunday October 10, 2027.

What will the weather be like for the 2027 Chelmsford Half Marathon?

The forecast calls for a high of 60°F and a low of 52°F with a 10% chance of rain. Check our detailed hourly forecast above for the best half marathon race plan.

Historical Weather

Based on 12 years of data
Avg Temp
54°F
L:52° H:55°
RunScore
8
Conditions
Rain Freq
0%
0 of 12 yrs
Wind9mph
Dew49°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

YearConditionsLow / HighRainScoreResults
2026
cloudy
48°/54°-
10
2025
cloudy
50°/53°-
10
2024
clear-day
44°/46°-
10
2023
clear-day
41°/45°-
10
2022
clear-day
52°/57°-
8
2021
partly-cloudy-day
53°/55°-
8
2019
partly-cloudy-day
57°/61°-
7
2018
cloudy
57°/58°-
7
2017
clear-day
57°/62°-
6
2016
cloudy
54°/57°-
7
2015
partly-cloudy-day
50°/53°-
9
2014
partly-cloudy-day
61°/62°-
6