Kielder Half Marathon
Race Day Weather
Cool start — fast day potential, moderate wind, chance of rain
A cool 49°F at the start line is ideal for fast times — expect to warm up quickly once you're moving. Moderate winds around 12mph may affect pacing on open sections of the course. There's a chance of rain, so have a backup gear plan ready. High humidity (84%) will make it harder to cool down through sweat — increase fluid intake accordingly.
Pace Calculator
Enter a finish time to see what race day does to it.
Get forecast alerts for Kielder Half Marathon
We'll text or email you when the forecast shifts — so you can adjust gear, pacing, and strategy. Max one per day.
Race Info
The Kielder Half Marathon is a trail half marathon on the Sunday of race weekend, starting at Kielder Dam and finishing at Kielder Waterside. The course follows paths and forest tracks in Kielder Forest around the shore of Kielder Water, the largest man-made lake in northern Europe.
