Mira - surf spot statistics

Best Surf Season (October - March)

The North Atlantic roars to life during the autumn and winter months, delivering the most consistent and powerful swells to Mira's west-facing shores. Average swell heights range from 2.0m to 2.5m, with periods frequently exceeding 12 seconds, fueled by a parade of extratropical cyclones tracking across the North Atlantic. Wind patterns become more favorable as high-pressure systems shift south, with ideal offshore flow (from the west-southwest through west-northwest) occurring 40-50% of the time. This is prime time for XL waves and long-period groundswells, especially when a deep low pressure system aligns with a stable continental high, creating clean, glassy conditions. December and January are the peak months, often rewarding surfers with epic, pumping surf.

Fair Surf Season (April - May & September)

As the transition zones of spring and early autumn, these months offer a mixed bag but can produce excellent surf. Swell heights drop to a more manageable 1.6m-2.0m range with periods averaging 10-11 seconds, making for rippable, fun-sized waves. The jet stream begins to shift north, reducing the frequency of powerful storms, but strong Atlantic lows can still deliver solid WNW-NW swell windows. Wind patterns become more unpredictable; the percentage of favorable offshore flow decreases to around 21-29% in spring, then climbs back to 25% in September as the summer pattern breaks down. Surfers need to stay flexible, hunting for windows of clear skies and east-northeast winds that sometimes follow a passing trough.

Low Surf Season (June - August)

Summer brings the least promising surf conditions to Mira. The North Atlantic high-pressure system dominates, shifting storm tracks well to the north and shrinking the average swell height to a mere 1.4m-1.5m. Wave periods shorten to 8.6-9.2 seconds, producing mostly short-period, localized windswell rather than powerful groundswell. Offshore wind frequency plummets to a dismal 9-13%, with persistent onshore winds from the northwest quadrant (generally NW-N) ruining the texture. While an occasional pulse of longer-period swell from a distant hurricane or rare low can sneak in, surfers will generally face small, choppy, and blown-out conditions. This is a great time to travel to more reliable spots or explore other activities.

December: Peak Consistency

December rounds out the year with the most consistent, active surf of the season. The average swell height is 2.4m and period is long at 12.6s, nearly matching January. NW (20.9%) and WNW (18.3%) dominate the swell window, with a healthy dose from the W (7.6%) and SW (1.7%) directions. The percentage of pumping, overhead surf (1.5-2.5m) is at its peak, and XL swells (>2.5m) are common. Wind conditions are the most favorable of the year: ideal offshore flow occurs 50% of the time, often under the influence of a strong Azores High or a continental anticyclone that maintains light to moderate easterly winds. The wind tables show a high percentage of light winds from the east (12.8%) and southeast (7.8%), which are perfect for creating clean, glassy faces. December is a premier month for surfing at Mira, offering powerful, long-period swells with excellent wind conditions.