The most recent edition on this page is dated Sep 14, 2025. 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.
Marathon
IRONMAN World Champs Nice - Run Leg
2027 date not locked yetNice, France
Goal time
3:15:00
Adjusted time (preview)
About 26 m of climbing and 26 m of descent. Mostly flat.
Almost all within 2%No grades over 6%No counted climbs
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.
Historical weather
Mean of race-window hours across the last 10 years, ±5 days around 14 September. Sticky years still count. This is not a forecast.
25°C
23 - 29°C range
Partly cloudy on average
Historical: hot, partly cloudy
Historical average
10 years · ±5d around 14 September
2016-2025
Cloud Cover
31%
14 - 100% range
Wind
9km/h
5 - 28 km/h range • prevailing SSE
Humidity
56%
29 - 74% range
WBGT
22.5°C
22.4 - 22.6°C range
Race morning history
Last 10 years, around the 12:30 start hour. Typical mid-September air averages 25°C (about 21°C to 29°C in that window). The bands are that history, not a forecast range. Hover or drag to explore.
Race-morning temperature
Most mornings
23-27°C
Almost all
21-29°C
Humidity
56%
Dew
16°C
WBGT
23°C
25°CAverage
12:30-15:48
Almost all (90%)Most mornings (70%)AverageRain
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 3:18. 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.
S
Most frequent (30%)
Wind speed
0-6 km/h
6-13 km/h
13-21 km/h
21+ km/h
A start that feels cool is not a promise about the second half.
Related races
Same city, region or country, when we can resolve them. World majors also point to each other.
- Marathon des Alpes-Maritimes Nice-Cannes
- IRONMAN 70.3 World Championship Nice - Run Leg
- IRONMAN Tours Metropole - Loire Valley
- Marathon de Nantes
- Paris Marathon
- Semi de Paris (Half)
- Marathon Calais XXL
- Marathon du Lac d'Annecy
View race map for this area.
Make sense of the conditions
- Dew point, WBGT and running in the heat
Read the heat and humidity before deciding what pace makes sense.
- When drafting helps your running pace
A group can help, but its pace and the conditions still need to suit you.
- Pacing the climbs and descents
Use the course profile to think about effort, not just splits.
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 IRONMAN World Champs Nice - Run Leg.
Pacing, splits, and race-day strategy personalised to your fitness and this course.
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