Surf Conditions Keremma Today — Score 4.7/10 and Complete Weather Analysis

Keremma is delivering modest but workable conditions on 18 August 2026. A 0.94-metre swell with a 5.0-second period is wrapping into this Breton Atlantic spot, producing a respectable 4.7/10 rideability score at peak window. This isn't a barn-burner day, but it's entirely rideable—especially for intermediate surfers who understand how to read small-period waves and work with the available tide cycles. The real story here is understanding why these conditions exist and where the best water time sits within your window. Today's setup reflects classic summer Atlantic patterns: moderate fetch-generated swell with a relatively short period. The westerly wind at 9.4 km/h plays a crucial role in shaping what you'll encounter in the water. This is neither pure offshore nor aggressively onshore—it's a marginal wind condition that demands strategic timing. Your session window is compressed, but that's actually typical for August conditions on the Breton coast when thermal effects and shifting pressure systems create brief windows of rideability.

🕐 Best session windows

The best session window at Keremma today is 20h00, where the score peaks at 4.7/10. This timing matters because late afternoon/early evening typically offers the most stable wind patterns after the day's thermal chop has settled. At 20h00, the 0.94-metre swell and 5.0-second period will be at their most organized as the tide transitions through its cycle. The westerly wind direction (O) at 9.4 km/h is marginal for Keremma's orientation—not strong enough to create significant offshore texture, but light enough to avoid heavy onshore deterioration. Avoid early morning sessions; the average swell height across the day sits at 0.8m, suggesting morning lumpiness and disorganization before the forecast peak. If you have flexibility, push toward evening to catch the cleaner, more defined sets.

📊 Detailed weather analysis

The 5.0-second wave period is the critical limiting factor today. Short-period swell—anything under 8 seconds—lacks the power and spacing that creates premium wave quality. What this means in practical terms: you'll be paddling more frequently, sets will come through tighter and closer together, and the individual waves won't have the shoulder you'd get from longer-period groundswell. That said, a 5.0s period isn't disastrous; it's the threshold where waves remain rideable if they're organized enough. The 0.94-metre swell height combined with this period suggests waves in the waist-to-shoulder range at peak—not massive, but sufficient for turning and progression on the right bank. Keremma's exposure to Atlantic swell combined with its bottom contours means that short-period energy typically bends and refracts into the bay reasonably efficiently. However, the swell direction today (likely south-southwest based on typical Atlantic patterns in August) means the spot is receiving direct exposure without significant shadow zones. The westerly wind will interact with incoming sets in a neutral fashion—not helping cross-shore winds worsen the situation, but equally not providing the clean, glassy conditions that offshore wind would offer. This is why timing the 20h00 window is essential: by then, any surface chop will have settled, and you'll be working with the cleaner face of each wave.

📍 About the spot

Keremma in Bretagne is a bay-sheltered Atlantic break that benefits from moderate swell refraction and a relatively consistent seabed structure. Located on France's northwestern coast, it naturally filters out the harshest wind and receives fairly consistent Atlantic groundswell except during summer months when fetch zones become disorganized and short-period chop dominates. The spot's orientation means it responds best to swell periods above 8 seconds; below that threshold, the break becomes dependent on tide state and wind cleanliness to deliver quality. August conditions typically see weaker Atlantic low-pressure systems, resulting in the shorter-period, smaller-volume swell characteristic of today's 0.94-metre, 5.0-second forecast. This is the season when Keremma's reputation as a 'summer backup spot' applies—it works, but you're not chasing it as a primary destination.

📅 Week forecast

The week ahead shows gradual improvement mid-week before deteriorating again into the weekend. Wednesday (19/08) remains nearly identical to today: 4.5/10, 0.9m swell—skip it unless you need water time. Thursday (20/08) is the week's standout day, jumping to 5.5/10 with nearly double the swell at 1.9m; longer-period fetch is generating this improvement, and you should make Thursday your priority session. Friday (21/08) sustains quality at 6.0/10 with 1.8m swell—arguably the best two-day window of the week for progression and proper turns. By Saturday (22/08), conditions collapse back to 4.5/10 with 0.9m, suggesting the swell train has passed and local chop reasserts itself. Sunday and Monday decline further (4.0/10 across both days). Bottom line: use today as a warm-up, prioritize Thursday-Friday, and plan your week around that mid-week window when period likely extends beyond 6 seconds.

❓ FAQ

What time is best to surf at Keremma today?

20h00 is your optimal window, scoring 4.7/10 at peak. This is when the 0.94-metre swell and 5.0-second period are most organized, and the westerly wind has settled into its least-disruptive pattern. Avoid morning sessions; the 0.8m average across the day indicates early lumpiness. Late afternoon pushes you toward cleaner, more defined sets.

What is the surf score at Keremma on 18/08/2026?

The maximum score is 4.7/10, achieved at 20h00. This reflects modest but workable conditions: 0.94m swell height with a 5.0-second period and 9.4 km/h westerly wind. A 4.7 score indicates intermediate-level rideability—not beginner-soft, not advanced-demanding, but solidly rideable for surfers comfortable with small-period energy and efficient paddling.

Are conditions improving this week at Keremma?

Yes, significantly. Skip 18–19 August (both ~4.5/10). Thursday 20 August jumps to 5.5/10 with 1.9m swell—the week's first true improvement. Friday 21 August peaks at 6.0/10 with 1.8m, making Thursday–Friday your priority window. The swell likely extends its period during this fetch window, delivering cleaner, more powerful waves. Weekend conditions collapse back to 4.5/10, so front-load your sessions mid-week.