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Conditions at San Blas in September
September: Southern Hemi Surge with Tropical Moisture
September is the heart of the tropical cyclone season in the Eastern Pacific, and San Blas often reaps the reward. Average swell remains 4.5ft (1.4m) with a 13.0s period, and the directional spread broadens slightly: SSW leads at 73.1%, SW jumps to 16.2%, and S adds 8.7% - a 99.8% favorable total. The SW input can be especially juicy, with 7.4% at 3-5ft (1-1.5m) and 7.0% at 5-6.5ft (1.5-2m) from that direction alone.
Wind quality is moderate at 51% ideal, with 28.9% from the offshore quadrant. Onshore S/SSW/SW/WSW flow is 24.8%, and westerly cross-shore winds also make an appearance. Rain is at its annual peak with 8.14mm/day, so expect overhead showers and clean-up sessions between tropical waves. Air temps average 26.4°C and water is a warm 29.9°C. Whenever a hurricane or tropical storm spins up off the Mexican coast, the resulting SW/WSW swell can be flat-out epic.
Average Spot conditions at San Blas in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at San Blas 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 San Blas for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at San Blas 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 San Blas.