Vitruvian · Whitwell / Rutland WaterD−4 · 9 Sep 20:30 BST

Sunday.
Showers at dawn, dry bike.

13 Sep 2026 · 1.9 km / 88.5 km / 21.1 km · not a washout

Plan on this: 15°C swim in light showers, wetsuit on. Bike and run dry, W 7–11 mph, 19–21°C. Overnight is the wet bit. Recheck Friday morning.
Swim 06:30
15°
Water 18°C. BBC showers 49–61% 06–09. Vis Good. Sunrise 06:33. Wetsuit on.
Bike
W 10
Official 7–11 mph, gust 16–21. Models 8–13. Clearing from 09:00. Cap 144–146 first 35.
Run
20°
Sunny intervals, RH ~65%, dry. First 3 km at 6:15 still.

BBC Oakham · Sunday hourly

05:00
13°
dry · 5
06:00
15°
shwr 49% · 11
07:00
15°
shwr 60% · 11
08:00
16°
shwr 61% · 10
09:00
17°
shwr 58% · 10
10:00
17°
cloud 25% · 10
12:00
19°
dry 7% · 10
13:00
20°
dry 6% · 10
14:00
20°
dry · 10

Sources · Sun 13

SourceCallRain
BBC Oakham 20:01Light cloud, 21 / 11, W 11 gust 19PoP 61%
Met Office OakhamSunny intervals 21 / 12, gust 21. 07:00 16°, 7 mph, 20%50% at midnight
Empingham (course)22 / 13, 07:00 17°, 7 mph, 20%50% midnight
YR / MET Norway 17:27Z07:00 16° cloudy 12 mph · 13:00 21° fair 11 mph0.4 mm/6h dawn
2.7 mm overnight
UKMO / Open-Meteo15–20°, W 6–9 mph, vis 16 km, cloud breaking 08:000.6 mm day
0.0 mm 05–10h
ECMWF IFS16–22°, WSW 12–13 mph, gust ~251.0 mm at 05:00
then dry
GFS / ICONGFS dry 13–21° NW. ICON dry race window 17–22°overnight only
TWN / WeatherBug21 / 11, W 12. TWN <1 mm. Bug 25%PoP 60 / 25%
EnsemblesTmax ~20–21°. Wind median ~12 mphmedian 0.7–2 mm
10–20% ≥5 mm

Vs 7 Sep: morning shower risk is up (BBC 26% → 61%), amounts still small. Official wind unchanged / slightly calmer. Visibility better (Good, not Moderate). Saturday is the messy day (TWN 2–4 mm, gusts 30) — jacket for 17:00 registration. Lake 18.1°C today, ~18.0 on race day. Optional above 16 — still wear the suit.

Fuel unchanged: not a heat race. 80–90 g/h bike, 60 run. Do not chase 33 km/h on the tail legs.

Oakham BBC 2641128 · Met Office gcr7xkpur · Whitwell 52.670, −0.636
Not Isle-of-Wight Whitwell · vitruvian-dossier.pages.dev/race