Conditions at Mira in September
September: First Signs of Autumn
September is the first sign of hope. The average wave height nudges up to 5ft (1.6m), the period lengthens to 10.4s, and the ideal-wind score improves to 25 percent. There is still a strong summer influence - NW (39.4 percent) and NNW (22.2 percent) dominate the swell window - but the first autumnal lows are now close enough to send longer-period WNW groundswell into the coast. Wind remains predominantly NNW at 33.8 percent, so you will still need to pick clean windows, but there are noticeably more days with light easterly offshore flow. Water temp is at its warmest, 17.7C (64F), air averages 19.8C (68F), and rainfall begins to return at 1.78mm/day. As the month progresses and the storm track starts migrating south, Mira begins to wake up.
Average Spot conditions at Mira in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Mira 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 Mira for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Mira 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 Mira.