This is a regional read for the whole northwest coast of Puerto Rico — global wave model with public buoys nearby to sanity-check it. Mornings lean toward light winds (86% of the morning windows with data). Confidence is reasonable for the first day 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. Notes on this week's data: The main swell arrives at an angle to this coast, so expect the smaller end of the range on most beaches. The main swell comes from a direction this coast is largely shielded from. Size is a rough guess and likely smaller than open-ocean numbers suggest.
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 | Knee-high · mellow, not much push · light wind | Knee-high · mellow, not much push · light wind | Reasonable estimate |
| Tue Sep 22 | Up to knee-high · mellow, not much push · light wind | Up to knee-high · mellow, not much push · light wind | Rough estimate |
| Wed Sep 23 | Knee- to waist-high · moderate push · light cross-shore wind | Waist-high · moderate push · light cross-shore wind | Reasonable estimate |
| Thu Sep 24 | Knee- to waist-high · mellow, not much push · light wind | Knee- to waist-high · mellow, not much push · light wind | Rough estimate |
| Fri Sep 25 | Knee-high · mellow, not much push · light wind | Knee-high · mellow, not much push · light onshore wind | Trend only |
| Sat Sep 26 | Waist- to chest-high · moderate push · light wind | Chest- 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 cross-shore wind | Rough estimate |
Boards that fit the northwest coast of Puerto Rico this week
| Board | Fits | Wave size | Power | Skill |
|---|---|---|---|---|
| Infinity Slinger Twin | 14 of 14 windows | Knee-high → overhead | Moderate | Intermediate to advanced |
| Bing PINTAIL LIGHTWEIGHT TYPE 2 | 14 of 14 windows | Knee-high → overhead | Soft | Beginner-friendly to advanced |
| Bing PINTAIL TYPE 2 | 14 of 14 windows | Knee-high → overhead | Soft | Beginner-friendly to advanced |
| Firewire Surfboards Too Fish | 14 of 14 windows | Knee-high → overhead | Moderate | Beginner-friendly to advanced |
| TC Surfboards Retro Single Fin | 14 of 14 windows | Knee-high → overhead | Moderate | Beginner-friendly to intermediate |
| Webber Surfboards Fatburner | 14 of 14 windows | Knee-high → double-overhead+ | Moderate | Intermediate to advanced |
| Album Surf Mote Channel Tri | 14 of 14 windows | Knee-high → overhead | Moderate | Beginner-friendly to advanced |
The picks, in order
1. Infinity Slinger Twin
Infinity Slinger Twin runs knee-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 small-wave shortboard with an intermediate to advanced skill window.
Quivr catalog read: The Slinger Twin offers a fast and agile ride, perfect for intermediate to advanced surfers looking to maximize their performance in small to medium waves.
Category: Small-wave shortboard · Swallow tail · Catalog ability: intermediate · 4.0★ from 1 Quivr rating
2. Bing PINTAIL LIGHTWEIGHT TYPE 2
Bing PINTAIL LIGHTWEIGHT TYPE 2 runs knee-high to overhead; that wave window overlaps every one of the 14 half-day windows we have data for this week. Its soft power midpoint is firmer than the week's typical push, so it comes alive on the windows with more push. A longboard with a beginner-friendly to advanced skill window.
Quivr catalog read: The Pintail Lightweight Type 2 offers a responsive and smooth ride, ideal for surfers looking to excel in medium to head high waves.
Category: Longboard · Pintail · Catalog ability: intermediate
3. Bing PINTAIL TYPE 2
Bing PINTAIL TYPE 2 runs knee-high to overhead; that wave window overlaps every one of the 14 half-day windows we have data for this week. Its soft power midpoint is firmer than the week's typical push, so it comes alive on the windows with more push. A longboard with a beginner-friendly to advanced skill window.
Quivr catalog read: The Pintail Lightweight Type 2 offers a responsive and smooth ride, ideal for surfers looking to excel in medium to head high waves.
Category: Longboard · Pintail · Catalog ability: intermediate
4. Firewire Surfboards Too Fish
Firewire Surfboards Too Fish runs knee-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 fish with a beginner-friendly to advanced skill window.
Quivr catalog read: The Too Fish is designed for intermediate to advanced surfers looking for a versatile board that excels in small to overhead waves.
Category: Fish · Catalog ability: intermediate · 4.0★ from 1 Quivr rating
5. TC Surfboards Retro Single Fin
TC Surfboards Retro Single Fin runs knee-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 longboard with a beginner-friendly to intermediate skill window.
Quivr catalog read: The Retro Single Fin offers a nostalgic ride reminiscent of the 70s, perfect for stylish turns in a variety of wave conditions.
Category: Longboard · Catalog ability: intermediate
6. Webber Surfboards Fatburner
Webber Surfboards Fatburner runs knee-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 small-wave shortboard with an intermediate to advanced skill window.
Quivr catalog read: The Webber Fatburner is perfect for intermediate to advanced surfers looking for a buoyant board that excels in small to medium-sized waves.
Category: Small-wave shortboard · Swallow tail · Catalog ability: intermediate
7. Album Surf Mote Channel Tri
Album Surf Mote Channel Tri runs knee-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 midlength with a beginner-friendly to advanced skill window.
Quivr catalog read: The Mote Channel Tri is designed for surfers looking for a versatile board that combines the drive of a performance shortboard with the forgiving nature of a midlength.
Category: Midlength · Catalog ability: intermediate
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 | Infinity Slinger Twin | 14 of 14 windows | Knee-high → overhead | Moderate |
| Groveler | Infinity Slinger Twin | 14 of 14 windows | Knee-high → overhead | Moderate |
| Fish | Firewire Surfboards Too Fish | 14 of 14 windows | Knee-high → overhead | Moderate |
| Twin fin | McTavish Dually | 14 of 14 windows | Knee-high → head-high | Moderate |
| Midlength | Album Surf Mote Channel Tri | 14 of 14 windows | Knee-high → overhead | Moderate |
| Longboard | Bing PINTAIL LIGHTWEIGHT TYPE 2 | 14 of 14 windows | Knee-high → overhead | Soft |
| Step-up | Album Surf Townsend | 14 of 14 windows | Knee-high → head-high | Moderate |
What this week asks of a board on the northwest coast of Puerto Rico
The week spreads from near-flat 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 "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 flat to ankle-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 northwest coast of Puerto Rico this week?
Across Sep 21–27, 2026 the regional read runs up to head-high. The most size shows Sun Sep 27 afternoon, chest- to head-high (rough estimate); the smallest window is Tue Sep 22 afternoon, up to knee-high. Confidence is reasonable for the first day and drops to "rough estimate" after that. Sheltered beaches along this stretch run smaller than the read.
Which surfboards fit the northwest coast of Puerto Rico this week?
Slinger Twin, PINTAIL LIGHTWEIGHT TYPE 2, PINTAIL TYPE 2 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, longboard 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 northwest coast of Puerto Rico?
Sun Sep 27 afternoon, chest- to head-high (rough estimate). Size builds Wed, Sat and Sun and eases Tue and Thu. Mornings lean toward light winds (86% of the morning windows with data).
Does this apply to my exact spot?
No single spot is named or predicted here. The read describes the northwest coast of Puerto Rico 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.