Belfast City Marathon
Race Day Weather
Cool start, steady tailwinds
Runners will face a temperature range from 48°F at the start to 52°F by the finish, with a steady humidity of 75%. A light tailwind will aid runners through miles 1-3, 5, 7-8, and 11, helping to maintain pace. Adjustments may be necessary during the headwind sections at miles 4, 20, and 25, and hydration will be crucial given the humidity.
Pace Calculator
Enter a finish time to see what race day does to it.
Get forecast alerts for Belfast City Marathon
We'll text or email you when the forecast shifts — so you can adjust gear, pacing, and strategy. Max one per day.
Get your personalized Belfast City 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 Info
The Belfast City Marathon runs through Belfast, Northern Ireland, starting at Stormont Estate and finishing at Ormeau Park. The AIMS-certified 26.2-mile course is run on a Sunday in early May and is paired with a team relay covering the same route in stages on the same day. It is Northern Ireland's largest mass-participation running event, with a combined field across the marathon weekend reported at 15,000 to 18,000 participants.