Historical Lookback — Cascais Beach
Compare Ocean Viewing Index and tide patterns across the past 5 years.
Same Period: Oct
How this month has compared over recent years.
| Year | Avg OVI | Avg Tide Range | Observations |
|---|---|---|---|
| 2025 | 83.2 | — | 9 |
| 2026Current | 83.2 | — | 23 |
2026 — Year-to-Date
Monthly averages across all observations this year.
Jan 2026
81.5
Avg Tide Range: —
Feb 2026
81.3
Avg Tide Range: —
Mar 2026
80.9
Avg Tide Range: —
Apr 2026
81
Avg Tide Range: —
May 2026
81.3
Avg Tide Range: —
Jun 2026
83.2
Avg Tide Range: —
Jul 2026
83.2
Avg Tide Range: —
Aug 2026
83.1
Avg Tide Range: —
Sep 2026
83.2
Avg Tide Range: —
Oct 2026
83.2
Avg Tide Range: —
All Years Summary
| Year | Months Tracked | Avg OVI | Range |
|---|---|---|---|
| 2025 | 3 | 82.0 | 81.3 – 83.2 |
| 2026 | 10 | 82.2 | 80.9 – 83.2 |
OVI Sub-Indices History
Six dimensions of ocean viewing quality over time.
pitarch_climatology91 days · 2026-07-25 → 2026-10-23
Sea Color
Sea color (Forel-Ule scale) — empty block means no verified data.