Conditions at Kirra in September
September: Spring Wind Shifts and Shorter Windows
September sees the season turn toward spring, and not in Kirra's favor. Ideal wind drops to 38%, average period falls to 7.8s, and the swell height holds at 0.9m (3ft). The swell direction becomes more northerly in the data - NNE 13%, NE 12%, ENE 13%, E 21%, ESE 17% - but the wind rose shows the problem: NNW blows 21% of the time and NNE adds another 6%. That is direct onshore flow for a north-facing beach. The prevailing spring pattern of strong NW-NNW winds ahead of troughs keeps the surface choppy and drains the quality out of the short-period E/ESE swell. Only when a cold front sweeps through with a S/SW change does the surf become clean, but those windows are isolated. Water temperature is 20.5°C, air temperature averages 20.0°C, and rain is sparse at 1.20mm/day. Bring a longboard.
Average Spot conditions at Kirra in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Kirra 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 Kirra for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Kirra 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 Kirra.