Typical race-morning air at Weymouth 70.3 Ironman - Run Leg averages 14°C across the last 10 years (about 10°C to 18°C in that window). The morning can still warm as you run. Use that range for planning, not as a promise for race day.
113.0 km
Weymouth 70.3 Ironman - Run Leg
Upcoming, awaiting next editionWeymouth, Dorset, UK
Goal time
12:00:00
Adjusted time (preview)
About 34 m of climbing and 34 m of descent. Mostly flat.
Almost all within 2%No grades over 6%No counted climbs
Impacts
Based on the forecast for race day.
Elevation
Heat
Wind
Total Impact
Race Pass: personalised finish time, adjusted splits, and your race-day pacing plan.
Race Day Forecast
The live outlook for this start.
16°C
Feels like 16°C
Race start: 17°C → 17°C
Forecast: overcast, with moderate winds
Race Day Pacing
Personalized pacing with weather-adjusted strategy tailored to your fitness level.
Race Pass turns this into your personalised split plan, paced for this course and forecast
Live forecast, route, and elevation
Cloud Cover
94%
Wind
19.0km/h
Humidity
84%
WBGT
12.9°C
Race Day Pacing
Personalized pacing with weather-adjusted strategy tailored to your fitness level.
Race Pass turns this into your personalised split plan, paced for this course and forecast
Live forecast, route, and elevation
Race Timeline
Race starts 00:00
23:00
Starts 00:00
18°C
Feels 18°C
0.2 mm
18%
23.2 km/h
gust 37.9
00:00
Starts 00:00
17°C
Feels 17°C
0.0 mm
0%
22.0 km/h
gust 30.5
01:00
9.4 km
17°C
Feels 17°C
0.0 mm
0%
19.2 km/h
gust 29.5
02:00
18.8 km
17°C
Feels 17°C
0.0 mm
0%
20.9 km/h
gust 28.4
03:00
28.3 km
16°C
Feels 16°C
0.0 mm
0%
21.2 km/h
gust 28.7
04:00
37.7 km
16°C
Feels 16°C
0.0 mm
4%
18.6 km/h
gust 25.4
05:00
47.1 km
15°C
Feels 15°C
0.0 mm
0%
18.6 km/h
gust 25.3
06:00
56.5 km
15°C
Feels 15°C
0.0 mm
0%
18.6 km/h
gust 25.0
07:00
65.9 km
14°C
Feels 14°C
0.0 mm
0%
17.9 km/h
gust 23.9
08:00
75.3 km
15°C
Feels 15°C
0.0 mm
0%
18.8 km/h
gust 25.7
09:00
84.8 km
15°C
Feels 15°C
0.0 mm
0%
18.1 km/h
gust 24.3
10:00
94.2 km
16°C
Feels 16°C
0.0 mm
0%
18.4 km/h
gust 24.6
11:00
103.6 km
17°C
Feels 17°C
0.0 mm
0%
16.8 km/h
gust 23.5
12:00
113.0 km
17°C
Feels 17°C
0.0 mm
0%
15.9 km/h
gust 21.5
13:00
Finished
18°C
Feels 18°C
0.0 mm
0%
16.3 km/h
gust 21.6
Conditions over time
20 Sept 2026 · Scroll to see the full race · hover to explore
84% humidityDew 13.5°CWBGT 12.9°C0.0 mm (0%)
16°CFeels 16°C
00:00-12:00
TempDewWBGTRain
19.0 km/h
gust 26.4 km/h
WindGust
Race morning history
Last 10 years, around the 00:00 start hour. Typical mid-September air averages 14°C (about 10°C to 18°C in that window). The bands are that history, not a forecast range. Hover or drag to explore.
Race-morning temperature
Most mornings
12-16°C
Almost all
11-18°C
Humidity
87%
Dew
12°C
WBGT
11°C
14°CAverage
00:00-09:22
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 9:22. 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 (21%)
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.
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 Weymouth 70.3 Ironman - Run Leg.
Pacing, splits, and race-day strategy personalised to your fitness and this course.
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