Based on a running trail moisture index: rain adds to it, dry warm days take it away. Under 12 = Ride, 12–30 = Caution (soft patches, avoid skidding), over 30 or heavy rain in the last 24h = Too wet (riding damages the surface).
Live rainfall, evapotranspiration and soil moisture data for Uki via Open-Meteo. This is an estimate — official closures and local knowledge always win.