Osbourne • Statistics for September

September: The Magic Window Opens

September is where the surf season starts to re-awaken. The average swell height rises to 4ft (1.2m) and the average period jumps back to 8.5s, signalling a return to more organized groundswell. The favorable direction window-E, ESE, SE, and SSE-peaks at over 42 percent of the total rose, led by SSE (17.4 percent), SE (12.7 percent), and ESE (8.0 percent). S (19.0 percent) and SSW (18.6 percent) still contribute, but now a much higher proportion of energy is arriving from the optimal ESE-SSE angles that directly hit Osbourne's beach. Winds begin to transition out of the summer regime as well: SW (15.7 percent) and WSW (11.0 percent) are still present, but W (7.7 percent), WNW (7.1 percent), NW (6.5 percent), and NNW (9.2 percent) combine to give 37 percent ideal surf wind conditions. Water temperature is at a comfortable 14.8°C, air temperature averages 16.3°C, and precipitation is 3.18 mm/day. This is the classic month for hurricane swells and early-season autumn lows to deliver clean, overhead waves to Osbourne before winter's cold grip takes hold.