This is a regional read for the whole Northern California coast (Humboldt & Del Norte) — global wave model with public buoys nearby to sanity-check it. Mornings lean toward cross-shore winds (86% of the morning windows with data); afternoons lean toward cross-shore 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. Notes on this week's data: Most of the wave energy is local wind chop rather than swell — expect a disorganised, weak surface. The main swell arrives at an angle to this coast, so expect the smaller end of the range on most beaches.
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 | Head-high · mellow, not much push · moderate cross-shore wind — some texture | Head- to overhead · moderate push · moderate cross-shore wind — some texture | Fairly confident |
| Tue Sep 22 | Overhead to double-overhead · solid push · strong cross-shore wind — some texture | Overhead to double-overhead · solid push · strong cross-shore wind — some texture | Fairly confident |
| Wed Sep 23 | Overhead · moderate push · strong cross-shore wind — some texture | Overhead · moderate push · moderate cross-shore wind — some texture | Reasonable estimate |
| Thu Sep 24 | Head- to overhead · moderate push · light onshore wind | Head- to overhead · moderate push · light cross-shore wind | Reasonable estimate |
| Fri Sep 25 | Overhead · moderate push · strong cross-shore wind — some texture | Overhead · moderate push · strong cross-shore wind — some texture | Rough estimate |
| Sat Sep 26 | Overhead · moderate push · light cross-shore wind | Overhead · moderate push · moderate cross-shore wind — some texture | Rough estimate |
| Sun Sep 27 | Head-high · mellow, not much push · light cross-shore wind | Waist- to chest-high · mellow, not much push · light cross-shore wind | Trend only |
Boards that fit the Northern California coast (Humboldt & Del Norte) this week
| Board | Fits | Wave size | Power | Skill |
|---|---|---|---|---|
| Haydenshapes Hypto Krypto | 14 of 14 windows | Waist-high → double-overhead+ | Moderate | Beginner-friendly to intermediate |
| Haydenshapes Hypto Krypto Twin Pin FutureFlex | 14 of 14 windows | Waist-high → double-overhead+ | Moderate | Beginner-friendly to advanced |
| Channel Islands Twin Pin | 14 of 14 windows | Waist-high → double-overhead+ | Moderate | Intermediate to advanced |
| Tomo Surfboards Delta X | 14 of 14 windows | Chest-high → double-overhead+ | Moderate | Intermediate to advanced |
| Tomo Surfboards Revo | 14 of 14 windows | Chest-high → double-overhead+ | Moderate | Intermediate to advanced |
| Slater Designs Sci-Fi 2.0 | 14 of 14 windows | Waist-high → overhead | Moderate | Intermediate to advanced |
| Aipa Genesis 1:1 | 14 of 14 windows | Chest-high → double-overhead+ | Moderate | Intermediate to advanced |
The picks, in order
1. Haydenshapes Hypto Krypto
Haydenshapes Hypto Krypto 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 sits close to the week's typical push. A hybrid with a beginner-friendly to intermediate skill window.
Quivr catalog read: The Hypto Krypto excels in a variety of conditions, making it ideal for both beginners and advanced surfers.
Category: Hybrid · 5.0★ from 17 Quivr ratings
2. Haydenshapes Hypto Krypto Twin Pin FutureFlex
Haydenshapes Hypto Krypto Twin Pin FutureFlex 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 sits close to the week's typical push. A hybrid with a beginner-friendly to advanced skill window.
Quivr catalog read: The Hypto Krypto Twin Pin excels in a variety of conditions, making it suitable for surfers of all skill levels.
Category: Hybrid
3. Channel Islands Twin Pin
Channel Islands Twin Pin 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 sits close to the week's typical push. A twin fin with an intermediate to advanced skill window.
Quivr catalog read: The Twin Pin is a versatile twin-fin board that excels in a variety of wave conditions, from small to overhead.
Category: Twin fin · Pintail · Catalog ability: intermediate · 4.0★ from 1 Quivr rating
4. Tomo Surfboards Delta X
Tomo Surfboards Delta X runs chest-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 sits close to the week's typical push. A performance shortboard with an intermediate to advanced skill window.
Quivr catalog read: The Delta X is designed for high performance surfing, offering exceptional speed and maneuverability.
Category: Performance shortboard · Catalog ability: intermediate
5. Tomo Surfboards Revo
Tomo Surfboards Revo runs chest-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 sits close to the week's typical push. A performance shortboard with an intermediate to advanced skill window.
Quivr catalog read: The Revo is an extremely fast and user-friendly board that excels in both flat sections and tight pockets, making it suitable for a wide range of surfers from beginners to advanced.
Category: Performance shortboard · Catalog ability: intermediate
6. Slater Designs Sci-Fi 2.0
Slater Designs Sci-Fi 2.0 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 sits close to the week's typical push. A hybrid with an intermediate to advanced skill window.
Quivr catalog read: The Sci-Fi 2.0 excels in a variety of conditions, handling waves up to double overhead while also performing well in smaller, flatter surf.
Category: Hybrid · Double bat tail · Catalog ability: intermediate
7. Aipa Genesis 1:1
Aipa Genesis 1:1 runs chest-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 sits close to the week's typical push. A performance shortboard with an intermediate to advanced skill window.
Quivr catalog read: The Genesis 1:1 is a refined all-around shortboard that excels in everyday surf, offering quick acceleration and effortless transitions.
Category: Performance shortboard · 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 | Haydenshapes Hypto Krypto | 14 of 14 windows | Waist-high → double-overhead+ | Moderate |
| Groveler | Webber Surfboards Fatburner | 14 of 14 windows | Knee-high → double-overhead+ | Moderate |
| Fish | Tomo Surfboards El Tomo Grande | 12 of 14 windows | Chest-high → double-overhead+ | Moderate |
| Twin fin | Channel Islands Twin Pin | 14 of 14 windows | Waist-high → double-overhead+ | Moderate |
| Midlength | Firewire Boss Up 2025 | 14 of 14 windows | Waist-high → overhead | Moderate |
| Longboard | Kazuma Surfboards Kazuma Classic | 14 of 14 windows | Knee-high → double-overhead+ | Moderate |
| Step-up | TC Surfboards Missing Link | 14 of 14 windows | Chest-high → overhead | Moderate |
What this week asks of a board on the Northern California coast (Humboldt & Del Norte)
The week spreads from waist-high to double-overhead, 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 double-overhead 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 Northern California coast (Humboldt & Del Norte) this week?
Across Sep 21–27, 2026 the regional read runs waist-high to double-overhead. The most size shows Tue Sep 22 morning, overhead to double-overhead (fairly confident); the smallest window is Sun Sep 27 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 Northern California coast (Humboldt & Del Norte) this week?
Hypto Krypto, Hypto Krypto Twin Pin FutureFlex, Twin Pin overlap the most of this week's 14 surf windows on catalog wave-size and power spectra; the shapes that fit best are hybrid, twin fin and performance shortboard. 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 Northern California coast (Humboldt & Del Norte)?
Tue Sep 22 morning, overhead to double-overhead (fairly confident). Size builds Tue and Fri and eases Thu and Sun. Mornings lean toward cross-shore winds (86% of the morning windows with data); afternoons lean toward cross-shore winds (100%).
Does this apply to my exact spot?
No single spot is named or predicted here. The read describes the Northern California coast (Humboldt & Del Norte) 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.