The opening gun fires on Sunday afternoon into conditions that look, on the surface, almost serene. Any skipper who mistakes that gentleness for an invitation to ease into the race is likely to pay a steep price before Monday is out. Race meteorologist Christian Dumard has mapped a weather pattern that shifts in character dramatically once darkness arrives, with westerlies building to 25 knots by Monday morning as the fleet pushes into the waters west of Ireland and approaches the Fastnet Rock.
At the start, wind speeds are expected to sit below 5 knots. What fills that void is a swell already running above two metres, giving the departure an awkward, rolling quality even without any real breeze to speak of. Some afternoon wind may stir briefly, but Dumard is clear on what follows: those puffs fade as night sets in, and crews will find themselves coaxing their boats through light airs in the small hours, managing boat speed and concentration in conditions that reward patience over aggression.
The calm does not last. By Monday morning a north-westerly flow builds and accelerates across the waters west of Ireland, and the foiling IMOCAs will be driving into conditions pressing towards 25 knots. For boats designed to lift onto foils, that level of breeze is not simply fast sailing. It is high-stakes sailing where precision becomes non-negotiable and any lapse in concentration carries a real cost. The Fastnet Rock itself is forecast to feature around Monday night or into the early hours of Tuesday, meaning the transition from glassy calm to hard-driving pressure will be one of the defining passages of this race's opening phase.
Those who manage that shift most effectively, arriving at the Rock with their crew rested, their systems dialled, and their heads fully in the game, will have a genuine opportunity to put clear water between themselves and those who struggled through the night. The quiet opening hours are not a footnote to the real racing. In Dumard's forecast, they are its foundation, and the crews who treat them as such will be far better placed when the westerly arrives in earnest.
