The most recent edition on this page is dated Sep 20, 2026. The next edition date is not locked here yet. Use the historical race-morning weather on this page for planning until the next date is published.
Half
Copenhagen Half Marathon (CPH)
Sunday, September 20, 2026Jagtvej, Copenhagen, Denmark
Goal time
1:35:00
Adjusted time (preview)
Impacts
Based on the historical mean for the race window over the last 10 years, ±5 days.
Elevation
Heat
Wind
Total Impact
Race Pass: personalised finish time, adjusted splits, and your race-day pacing plan.
Race morning history
Last 10 years, around the 09:47 start hour. Typical mid-September air averages 15°C (about 11°C to 19°C in that window). The bands are that history, not a forecast range. Hover or drag to explore.
Race-morning temperature
Most mornings
13-17°C
Almost all
11-19°C
Humidity
81%
Dew
12°C
WBGT
13°C
15°CAverage
09:47-11:22
Almost all (90%)Most mornings (70%)AverageRain
Year pills: green is favorable heat. Amber is moderate. Red is challenging.
Blue is most mornings. Dashed lines are the rare tails. Pink is the average. The bands are historical race mornings, not a forecast range. Blue columns are rain on the right scale. This assumes a 1:35. You can set your own time in the app.
Typical race-morning wind
Where the wind usually came from on race morning, not where it was going.
SW
Most frequent (20%)
Wind speed
0-6 km/h
6-13 km/h
13-21 km/h
21+ km/h
Year pills: green is favorable wind. Amber is moderate. Red is challenging. Colours assume no drafting.
A start that feels cool is not a promise about the second half.
How this course changes your pace
Flat is the easy bit. The course is a loop, so whatever the wind does you run into it for a few kilometres and away from it for a few, and the headwind costs more than the tailwind gives back.
- 100% sits between -2% and +2%. The steepest moment is about 1.5%. About 16 m of climbing and 18 m of descent (2 m to 14 m).
- The only rise worth naming is the gentle drift from 11 to 14 km. Start and finish sit about 500 m apart. This is a loop, not a point-to-point.
- The city takes the edge off. Turns break up street channelling, so the same wind costs less here than it would in open country.
The useful race plan:
- If the start feels easy, do not spend it. The second half still has the wind.
- Expect Vesterbro and Frederiksberg Allé, roughly 8 to 14 km to cost more than the tailwind gives back.
- A pack helps. Alone, the same 20 km/h loop is still +0.8% to +0.9%.
- Hold even effort even if that means slower than the A-goal.
Typical race window
10 editions, five days either side, 440 hours from 09:00 to 12:00. The bands are historical race mornings, not a forecast range.
- Typical hour: about 15.2°C
- About 1 in 4 hours sit at 13°C or cooler
- About about 1 in 20 reaches 20°C
- It still warms: 13.9°C at 09:00 to 16.6°C at 12:00
- 2023 is the sticky outlier: about 18.5°C, dew point about 15.3°C
Wind impact
Typical race-window wind sits around 17.6 km/h. 43 of 110 mornings reach 20 km/h. For a 1:30 half, 2019 costs about +1:36 / +1.78% alone. Sit in a pack and that drops to +0:18. Kamworor's 58:01 that morning is about about 55 seconds alone, or about 20 seconds the way he ran it, pack for 10 km then solo.
Related races
Same city, region or country, when we can resolve them. World majors also point to each other.
View race map for this area.
Pacing and conditions FAQ
Beyond conditions
Conditions are only part of the race-day loss
Pacing mistakes often add several minutes, sometimes more than conditions alone, especially when the course and conditions are not ideal.
What your plan includes
Everything you need to turn this race preview into a usable race-day plan.
Personalized pacing
Effort and pace guidance tuned to this course profile.
Weather-adjusted splits
Split targets that account for heat, wind, and elevation.
Heat adaptation & drafting
Adjust for your heat tolerance and drafting preferences.
Get your personalised race plan for Copenhagen Half Marathon (CPH).
Pacing, splits, and race-day strategy personalised to your fitness and this course.
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