30-day avg
2.4 ft
Cape Cod · Massachusetts
Monthly line · annual patterns · Outer Cape (Marconi)
Track daily max swell height for the last 30 days, then scan 2026 month-by-month to spot the year’s pattern.
Cape-wide chart based on Outer Cape (Marconi) model data (Open-Meteo marine). Heights are daily maximum swell in feet. Updated Oct 23, 7:49 AM EDT.
30-day avg
2.4 ft
30-day max
4.8 ft
2026 monthly avg
1.8 ft
Peak month so far
Feb 2.5 ft avg
Oct averages 2.1 ft so far; Feb still leads 2026 at 2.5 ft. Last 30 days averaged 2.4 ft (peak day 4.8 ft). Recent week is building versus the 30-day mean.
Line chart of each day’s maximum swell height (ft). Hover points for exact values.
| Date | Swell max (ft) | Wave max (ft) | Period (s) |
|---|---|---|---|
| 2026-10-22 | 3.7 | 6.2 | 8.0 |
| 2026-10-21 | 3.9 | 6.6 | 8.2 |
| 2026-10-20 | 4.8 | 6.0 | 8.7 |
| 2026-10-19 | 2.8 | 3.5 | 6.4 |
| 2026-10-18 | 1.9 | 3.5 | 5.9 |
| 2026-10-17 | 1.2 | 3.8 | 5.9 |
| 2026-10-16 | 1.3 | 2.6 | 10.6 |
| 2026-10-15 | 2.2 | 4.0 | 7.2 |
| 2026-10-14 | 2.5 | 3.0 | 5.7 |
| 2026-10-13 | 2.8 | 3.5 | 6.6 |
| 2026-10-12 | 2.0 | 3.6 | 6.9 |
| 2026-10-11 | 0.6 | 2.1 | 8.9 |
| 2026-10-10 | 1.2 | 1.6 | 8.9 |
| 2026-10-09 | 0.7 | 1.7 | 6.1 |
| 2026-10-08 | 0.7 | 1.8 | 8.2 |
| 2026-10-07 | 1.2 | 1.9 | 8.2 |
| 2026-10-06 | 1.6 | 3.4 | 7.7 |
| 2026-10-05 | 3.2 | 3.2 | 6.6 |
| 2026-10-04 | 2.2 | 2.5 | 5.8 |
| 2026-10-03 | 1.3 | 2.2 | 9.2 |
| 2026-10-02 | 0.9 | 2.1 | 7.7 |
| 2026-10-01 | 1.6 | 1.9 | 7.6 |
| 2026-09-30 | 2.0 | 2.2 | 7.8 |
| 2026-09-29 | 3.1 | 3.3 | 7.6 |
| 2026-09-28 | 3.9 | 4.5 | 6.6 |
| 2026-09-27 | 3.8 | 6.1 | 8.7 |
| 2026-09-26 | 2.6 | 7.0 | 8.9 |
| 2026-09-25 | 3.9 | 6.2 | 8.6 |
| 2026-09-24 | 4.3 | 5.5 | 8.1 |
| 2026-09-23 | 3.2 | 5.2 | 7.3 |
Average daily-max swell by month for 2026 so far. Use this to see which months run taller on the Outer Cape.
Highest single-day swell max inside each month.
| Month | Avg daily max (ft) | Peak day (ft) | Days |
|---|---|---|---|
| Jan 2026 | 1.7 | 6.8 | 31 |
| Feb 2026 | 2.5 | 4.8 | 28 |
| Mar 2026 | 2.1 | 5.2 | 31 |
| Apr 2026 | 2.1 | 4.5 | 30 |
| May 2026 | 1.8 | 4.8 | 31 |
| Jun 2026 | 1.3 | 4.3 | 30 |
| Jul 2026 | 1.3 | 3.0 | 31 |
| Aug 2026 | 1.1 | 1.9 | 31 |
| Sep 2026 | 1.9 | 4.3 | 30 |
| Oct 2026 | 2.1 | 4.8 | 23 |
Charts above are Cape-wide. Jump to a break for today’s wind, tide, and forecast.