This is a regional read for the whole Caribbean coast of Costa Rica — global wave model only — no public buoys nearby, so treat ranges as rougher. Mornings lean toward light winds (100% of the morning windows with data); afternoons lean toward light winds (100%). Confidence is reasonable for the first 4 days and drops to "rough estimate" after that.
Board ranges below are each board's full min→max spectrum from the Quivr catalog — the same chart the app draws — and "fits" counts how many of this week's half-day windows a board's wave and power windows overlap. Nothing here is a guess about a particular beach.
Estimates come from a global ocean wave model sampled offshore and translated into ranges. Actual size varies from beach to beach along this stretch; sheltered spots run smaller. Reads describe the whole coast, not one break — check wind and tide at your spot before paddling out. Reads are refreshed weekly on this page and several times a day in the Quivr app, which also matches each day against the boards in your own quiver.
Day by day: Sep 21–27, 2026
Morning is 6am–noon, afternoon is noon–7pm local. Words come straight from the regional read; "No data" means the wave model had no hours for that window.
| Day | Morning | Afternoon | Confidence |
|---|---|---|---|
| Mon Sep 21 | Waist-high · mellow, not much push · light wind | Waist-high · mellow, not much push · light wind | Fairly confident |
| Tue Sep 22 | Knee- to waist-high · mellow, not much push · light wind | Knee-high · mellow, not much push · light wind | Fairly confident |
| Wed Sep 23 | Knee-high · mellow, not much push · light wind | Knee-high · mellow, not much push · light wind | Reasonable estimate |
| Thu Sep 24 | Knee-high · mellow, not much push · light wind | Knee-high · mellow, not much push · light wind | Reasonable estimate |
| Fri Sep 25 | Waist-high · mellow, not much push · light wind | Waist-high · mellow, not much push · light wind | Rough estimate |
| Sat Sep 26 | Knee- to waist-high · mellow, not much push · light wind | Knee- to waist-high · mellow, not much push · light wind | Rough estimate |
| Sun Sep 27 | Knee- to waist-high · mellow, not much push · light wind | Knee- to waist-high · mellow, not much push · light wind | Rough estimate |
Boards that fit the Caribbean coast of Costa Rica this week
| Board | Fits | Wave size | Power | Skill |
|---|---|---|---|---|
| Channel Islands Dumpster Diver | 14 of 14 windows | Knee-high → chest-high | Soft | Intermediate to advanced |
| Dead Kooks Toro | 14 of 14 windows | Knee-high → chest-high | Soft | Beginner-friendly to intermediate |
| Haydenshapes Weird Series Dylan Graves | 14 of 14 windows | Knee-high → chest-high | Soft | Beginner-friendly to intermediate |
| Aipa X-file | 14 of 14 windows | Knee-high → chest-high | Soft | Beginner-friendly to advanced |
| Album Surf Sunstone Hovercraft | 14 of 14 windows | Knee-high → chest-high | Soft | Beginner-friendly to advanced |
| Album Surf Sunstone Hovermod | 14 of 14 windows | Knee-high → chest-high | Soft | Beginner-friendly to advanced |
| Almond Surfboards Rover | 14 of 14 windows | Knee-high → chest-high | Soft | Beginner-friendly to advanced |
The picks, in order
1. Channel Islands Dumpster Diver
Channel Islands Dumpster Diver runs knee-high to chest-high; that wave window overlaps every one of the 14 half-day windows we have data for this week. Its soft power midpoint sits close to the week's typical push. A small-wave shortboard with an intermediate to advanced skill window.
Quivr catalog read: The Dumpster Diver excels in small to medium waves, making it a great choice for summer surf.
Category: Small-wave shortboard · Square tail · Catalog ability: intermediate
2. Dead Kooks Toro
Dead Kooks Toro runs knee-high to chest-high; that wave window overlaps every one of the 14 half-day windows we have data for this week. Its soft power midpoint sits close to the week's typical push. A fish with a beginner-friendly to intermediate skill window.
Quivr catalog read: The Toro is designed for small days, maximizing fun with its stubby shape and versatile setup options.
Category: Fish · Vee tail · Catalog ability: beginner
3. Haydenshapes Weird Series Dylan Graves
Haydenshapes Weird Series Dylan Graves runs knee-high to chest-high; that wave window overlaps every one of the 14 half-day windows we have data for this week. Its soft power midpoint sits close to the week's typical push. A small-wave shortboard with a beginner-friendly to intermediate skill window.
Quivr catalog read: The Weird Series Dylan Graves board is designed for versatility and fun in all wave conditions, making it suitable for surfers looking for a forgiving performance board.
Category: Small-wave shortboard · Winged swallow tail · Catalog ability: intermediate
4. Aipa X-file
Aipa X-file runs knee-high to chest-high; that wave window overlaps every one of the 14 half-day windows we have data for this week. Its soft power midpoint sits close to the week's typical push. A fish with a beginner-friendly to advanced skill window.
Quivr catalog read: The Aipa X-file is designed for small waves, offering quick speed and tight turns.
Category: Fish · Catalog ability: intermediate
5. Album Surf Sunstone Hovercraft
Album Surf Sunstone Hovercraft runs knee-high to chest-high; that wave window overlaps every one of the 14 half-day windows we have data for this week. Its soft power midpoint sits close to the week's typical push. A fish with a beginner-friendly to advanced skill window.
Quivr catalog read: The Sunstone Hovercraft is a classic fish that excels in small surf, providing easy glide and fluid carves.
Category: Fish · Catalog ability: intermediate
6. Album Surf Sunstone Hovermod
Album Surf Sunstone Hovermod runs knee-high to chest-high; that wave window overlaps every one of the 14 half-day windows we have data for this week. Its soft power midpoint sits close to the week's typical push. A fish with a beginner-friendly to advanced skill window.
Quivr catalog read: The Sunstone Hovermod is a classic fish that excels in small surf, providing easy glide and fluid carves.
Category: Fish · Hip tail · Catalog ability: intermediate
7. Almond Surfboards Rover
Almond Surfboards Rover runs knee-high to chest-high; that wave window overlaps every one of the 14 half-day windows we have data for this week. Its soft power midpoint sits close to the week's typical push. A small-wave shortboard with a beginner-friendly to advanced skill window.
Quivr catalog read: The Rover is a compact thruster that excels in small surf, providing excellent lift and energy.
Category: Small-wave shortboard · Catalog ability: intermediate · 5.0★ from 2 Quivr ratings
Best fit by shape this week
One board per shape, chosen by how many of this week's 14 windows its wave and power windows overlap. Only shapes that overlap at least half the week are listed.
| Shape | Board | Fits | Wave size | Power |
|---|---|---|---|---|
| Shortboard | Channel Islands Dumpster Diver | 14 of 14 windows | Knee-high → chest-high | Soft |
| Groveler | Channel Islands Dumpster Diver | 14 of 14 windows | Knee-high → chest-high | Soft |
| Fish | Dead Kooks Toro | 14 of 14 windows | Knee-high → chest-high | Soft |
| Twin fin | Lost / Mayhem RNF Twinzer | 14 of 14 windows | Knee-high → chest-high | Soft |
| Midlength | Chilli Surfboards Middy | 14 of 14 windows | Knee-high → chest-high | Soft |
| Longboard | Bing BEACON | 14 of 14 windows | Knee-high → chest-high | Soft |
What this week asks of a board on the Caribbean coast of Costa Rica
Nothing in this week's read gets past waist-high. Paddle speed and glide matter more than hold — boards whose wave window starts low (knee-high) will see far more rideable sessions than anything built for a step.
Most windows read "mellow, not much push" for push. A board's power midpoint tells you where it will feel alive: mellower boards on the softer windows, firmer boards when the push is there. The table shows each board's own midpoint so the call is yours.
Already own one of these?
Add it to your quiver in Quivr and the Home tab does this matching for you — every day, against your own boards, for the coast you pick. If none of your boards overlap a window, it says so rather than forcing a pick.
Shopping instead? Open two of the picks above in Compare and read the low end of the wave-size range first — on a knee-high week that decides whether a board gets used.
Compare these picks head to head
Live Quivr comparison pages for pairs in this list — same spectra, side by side:
FAQ
How big will the surf be on the Caribbean coast of Costa Rica this week?
Across Sep 21–27, 2026 the regional read runs knee-high to waist-high. The most size shows Mon Sep 21 morning, waist-high (fairly confident); the smallest window is Thu Sep 24 morning, knee-high. Confidence is reasonable for the first 4 days and drops to "rough estimate" after that. Sheltered beaches along this stretch run smaller than the read.
Which surfboards fit the Caribbean coast of Costa Rica this week?
Dumpster Diver, Toro, Weird Series Dylan Graves overlap the most of this week's 14 surf windows on catalog wave-size and power spectra; the shapes that fit best are small-wave shortboard and fish. Open any of them in Quivr to see the full range chart and compare two side by side.
Which day has the most size on the Caribbean coast of Costa Rica?
Mon Sep 21 morning, waist-high (fairly confident). Size builds Fri and eases Tue and Wed. Mornings lean toward light winds (100% of the morning windows with data); afternoons lean toward light winds (100%).
Does this apply to my exact spot?
No single spot is named or predicted here. The read describes the Caribbean coast of Costa Rica as a whole — a stretch of coast facing roughly the same direction. Estimates come from a global ocean wave model sampled offshore and translated into ranges. Actual size varies from beach to beach along this stretch; sheltered spots run smaller. Reads describe the whole coast, not one break — check wind and tide at your spot before paddling out.
How often is this page updated?
Every week, with the same seven-day regional read the Quivr app shows on its Home tab. The app refreshes several times a day and also tells you which board in your own quiver fits each day.