Conditions at Unstad in September
September: The Autumn Awakening
September is the gate to winter. The average swell height jumps to 1.2m (4ft) and the period improves to 8.5s, a clear sign that the Norwegian Sea is waking up. The first solid WNW, NW and NNW swells of the autumn start showing up, with the optimal sector providing around 35% of the total wave energy. The 1-1.5m (3-5ft) class becomes much more common, and the occasional 1.5-2m (5-6.5ft) swell appears as Atlantic lows deepen.
Ideal offshore wind is 14%, the best of the shoulder season. Water temperature is still a relatively mild 11.4°C, air temperatures average 9.8°C, and precipitation increases to 3.35 mm/day. September is a smart month for a trip: there is real swell on the way, the water is still rideable with a good wetsuit, and the crowds are still thin.
Average Spot conditions at Unstad in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Unstad during September. Based on historical data, there is a % probability of groundswell occurring this month. The chart below provides a detailed breakdown of the average wave height distribution, offering deep insights into the swell quality and surf potential you can expect at Unstad for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Unstad for September. Our analysis shows that favorable offshore or side-shore winds coincide with surfable swell approximately % of the time. The accompanying graph illustrates the average size distribution of waves during these optimal wind windows at Unstad.