CatchWindow fishing intelligence

Boulogne-sur-Mer, France Daily Water Report — August 23, 2026

Today in Boulogne-sur-Mer, boating and diving enthusiasts should seize the day, with both activities scoring a solid 8.8 out of 10. The harbor presents a calm and inviting scene, with wave heights lingering between 0.3 and 0.4 meters, and the calmest conditions expected around 11:00 a.m. The light ESE winds, peaking at a mere 8 knots, ensure smooth sailing and clear diving conditions. The water temperature is a comfortable 20.6°C, slightly warmer than usual, which should make for a pleasant experience on and under the water. Fishing scores a decent 6.3, thanks to favorable solunar periods and stable weather conditions, although the lack of tide data adds a bit of mystery to the mix. Early morning and late evening will be your best bets for casting a line, aligning with the solunar major periods. Meanwhile, kayakers can also enjoy a good day out with a score of 7.8, benefitting from the gentle current and mild winds. Surfers, however, might find the day a bit underwhelming with a score of 4.9, as the modest 0.3-meter swell from the north-northeast won't offer much in terms of thrilling rides. Wildlife watchers can expect moderate activity, as the wind and solunar periods suggest some movement but not a spectacle. Looking ahead, the weather is set to warm up slightly, with temperatures climbing to 23.3°C by midweek. Wind speeds will increase, peaking at 18 knots by the weekend, accompanied by a higher chance of rain. The sea state will remain relatively calm until the weekend, when waves could rise dramatically to 3.2 meters. For today, diving and boating offer the best experiences, so grab your gear and enjoy the tranquility of Boulogne-sur-Mer’s waters.