CatchWindow fishing intelligence

Boulogne-sur-Mer, France Daily Water Report — October 6, 2026

Boulogne’s harbor gets a clear green light for small-craft time today: kayaking leads at 8.9/10, with boating close behind at 8.6 and diving at 8.8. The water is unusually tame, not merely “not too bad”—waves run just 0.1 to 0.3 m, with the calmest patch near 19:00 at about 0.14 m. A light southeast breeze, generally under 5.4 knots, leaves little wind-wave chop to argue with. The best practical window is from late morning through the early evening, when the mildest air arrives and the sea remains slight. Air temperatures rise from roughly 13 C to near 20 C, while marine SST holds at 18.8 C, 2.2 C above its average. That is comfortable by October standards on the water, though it does not erase the need for proper immersion protection. The current is modest at about 0.14 m/s toward the northwest, but harbor users should still treat it as a factor rather than a decoration on the chart. Fishing rates a middling 6.4/10. The 09:22–11:22 solunar major period is the better daylight timing, with a shorter minor period from 15:52–16:52. Pressure is falling from a relatively high level, and no tide data are available, so this is a day for flexible expectations rather than grand declarations. Chlorophyll is high at 4.82 mg/m³, but that is not a visibility reading or a guarantee of anything biting. The main compromise is overhead, not offshore: cloud cover is near 98%, weather conditions indicate fog, and atmospheric visibility is only about 0.22 km. That can make harbor navigation and shore-to-water orientation much less forgiving despite the calm surface. Diving’s strong score reflects the light wind, small waves and warm water, not a measured underwater-visibility report. Sailing, at 5.2/10, has smooth water but precious little breeze to work with. Compared with the last few days, kayaking and diving remain at the top of their recent range, while boating improves slightly from yesterday. Enjoy the lull: Wednesday brings stronger wind and rain chances, then waves build sharply toward Friday and Saturday. Best bet: launch early enough to use the quiet water, but keep the fog in charge of the day’s decisions.