This is a regional read for the whole south Pacific 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- to chest-high · moderate push · light wind | Waist- to head-high · solid push · light wind | Fairly confident |
| Tue Sep 22 | Waist- to head-high · moderate push · light wind | Waist- to head-high · solid push · light wind | Fairly confident |
| Wed Sep 23 | Waist- to chest-high · moderate push · light wind | Waist- to chest-high · moderate push · light wind | Reasonable estimate |
| Thu Sep 24 | Waist- to chest-high · moderate push · light wind | Waist- to chest-high · moderate push · light wind | Reasonable estimate |
| Fri Sep 25 | Waist- to chest-high · moderate push · light wind | Waist- to chest-high · moderate push · light wind | Rough estimate |
| Sat Sep 26 | Waist- to head-high · moderate push · light wind | Waist- to head-high · moderate push · light wind | Rough estimate |
| Sun Sep 27 | Chest- to head-high · moderate push · light wind | Chest- to head-high · moderate push · light wind | Rough estimate |
Boards that fit the south Pacific coast of Costa Rica this week
| Board | Fits | Wave size | Power | Skill |
|---|---|---|---|---|
| Roberts MM-16 | 14 of 14 windows | Waist-high → overhead | Moderate | Intermediate to advanced |
| JS Industries Sub Xero HYFI 3.0 | 14 of 14 windows | Waist-high → overhead | Moderate | Beginner-friendly to advanced |
| Roberts Star Chip | 14 of 14 windows | Waist-high → overhead | Moderate | Intermediate to advanced |
| Tomo Surfboards Vader V2 | 14 of 14 windows | Waist-high → overhead | Moderate | Intermediate to advanced |
| Channel Islands NeckBeard 3 | 14 of 14 windows | Waist-high → double-overhead+ | Moderate | Intermediate to advanced |
| Chemistry Surfboards Flash Point | 14 of 14 windows | Waist-high → overhead | Moderate | Intermediate to advanced |
| Haydenshapes Love Buzz | 14 of 14 windows | Waist-high → overhead | Moderate | Intermediate to advanced |
The picks, in order
1. Roberts MM-16
Roberts MM-16 runs waist-high to overhead; that wave window overlaps every one of the 14 half-day windows we have data for this week. Its moderate power midpoint is firmer than the week's typical push, so it comes alive on the windows with more push. A performance shortboard with an intermediate to advanced skill window.
Quivr catalog read: The MM-16 is a high-performance shortboard designed for quick maneuvers and versatility in various wave conditions.
Category: Performance shortboard · Catalog ability: intermediate
2. JS Industries Sub Xero HYFI 3.0
JS Industries Sub Xero HYFI 3.0 runs waist-high to overhead; that wave window overlaps every one of the 14 half-day windows we have data for this week. Its moderate power midpoint is firmer than the week's typical push, so it comes alive on the windows with more push. A hybrid with a beginner-friendly to advanced skill window.
Quivr catalog read: The Sub Xero HYFI 3.0 is designed for versatile performance in a variety of conditions.
Category: Hybrid
3. Roberts Star Chip
Roberts Star Chip runs waist-high to overhead; that wave window overlaps every one of the 14 half-day windows we have data for this week. Its moderate power midpoint is firmer than the week's typical push, so it comes alive on the windows with more push. A performance shortboard with an intermediate to advanced skill window.
Quivr catalog read: The Star Chip is a fast and responsive board that excels in everyday waves and rippable surf.
Category: Performance shortboard · Multi-angular swallow tail · Catalog ability: intermediate
4. Tomo Surfboards Vader V2
Tomo Surfboards Vader V2 runs waist-high to overhead; that wave window overlaps every one of the 14 half-day windows we have data for this week. Its moderate power midpoint is firmer than the week's typical push, so it comes alive on the windows with more push. A performance shortboard with an intermediate to advanced skill window.
Quivr catalog read: The Tomo Vader V2 offers an incredibly intuitive ride with effortless rail-to-rail transitions, making it ideal for good to advanced surfers.
Category: Performance shortboard · Catalog ability: intermediate
5. Channel Islands NeckBeard 3
Channel Islands NeckBeard 3 runs waist-high to double-overhead+; that wave window overlaps every one of the 14 half-day windows we have data for this week. Its moderate power midpoint is firmer than the week's typical push, so it comes alive on the windows with more push. A hybrid with an intermediate to advanced skill window.
Quivr catalog read: The NeckBeard 3 excels in a variety of conditions, offering a skatey feel and smooth transitions.
Category: Hybrid · Rounded tail · Catalog ability: intermediate · 4.0★ from 1 Quivr rating
6. Chemistry Surfboards Flash Point
Chemistry Surfboards Flash Point runs waist-high to overhead; that wave window overlaps every one of the 14 half-day windows we have data for this week. Its moderate power midpoint is firmer than the week's typical push, so it comes alive on the windows with more push. A performance shortboard with an intermediate to advanced skill window.
Quivr catalog read: The Flash Point is a user-friendly high-performance board that excels in a variety of wave conditions, making it suitable for daily use.
Category: Performance shortboard · Catalog ability: intermediate
7. Haydenshapes Love Buzz
Haydenshapes Love Buzz runs waist-high to overhead; that wave window overlaps every one of the 14 half-day windows we have data for this week. Its moderate power midpoint is firmer than the week's typical push, so it comes alive on the windows with more push. A performance shortboard with an intermediate to advanced skill window.
Quivr catalog read: The Love Buzz is a fast and flowing performance shortboard that excels in a variety of wave conditions.
Category: Performance shortboard · Catalog ability: intermediate · 5.0★ from 8 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 | Roberts MM-16 | 14 of 14 windows | Waist-high → overhead | Moderate |
| Groveler | Aipa Big Boy Sting | 14 of 14 windows | Waist-high → double-overhead+ | Punchy |
| Fish | Critters Toy Co Goblin | 14 of 14 windows | Knee-high → overhead | Moderate |
| Twin fin | Thunderbolt / Harley Ingleby MID 6 Mini Twin | 14 of 14 windows | Waist-high → overhead | Moderate |
| Midlength | Thunderbolt / Harley Ingleby MID 6 | 14 of 14 windows | Waist-high → overhead | Punchy |
| Longboard | LoveMachine FM | 14 of 14 windows | Waist-high → double-overhead+ | Punchy |
| Step-up | Aipa The Grey | 14 of 14 windows | Chest-high → overhead | Moderate |
What this week asks of a board on the south Pacific coast of Costa Rica
The week spreads from waist-high to head-high, so a single board with a wide wave window covers more sessions than a specialist. If you own two boards, split them: one for the smallest windows and one for the head-high ones.
Most windows read "moderate 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 waist-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 south Pacific coast of Costa Rica this week?
Across Sep 21–27, 2026 the regional read runs waist-high to head-high. The most size shows Sun Sep 27 morning, chest- to head-high (rough estimate); the smallest window is Thu Sep 24 afternoon, waist- to chest-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 south Pacific coast of Costa Rica this week?
MM-16, Sub Xero HYFI 3.0, Star Chip overlap the most of this week's 14 surf windows on catalog wave-size and power spectra; the shapes that fit best are performance shortboard and hybrid. 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 south Pacific coast of Costa Rica?
Sun Sep 27 morning, chest- to head-high (rough estimate). Size builds Sat. 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 south Pacific 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.