Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 7 pm 09 Jul 2026 (local time)

Forecast update in  hr  min

Today's Ammonias sea temperature is
26.3° C
0.1° 

Ammonias surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


Ammonias surf forecast from 10 Jul 2026:

  • Most powerful swell: Sunday 12 Jul, 11PM (local time) - 7ft (2.2m), 8s period, ENE swell with 574 kJ wave energy.

Best Forecast Surf Conditions for Ammonias this week:

The most powerful waves expected at Ammonias in the next 16 days are 2.2m 8s and forecast to arrive on Sunday (Jul 12) at 11PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 8s period and expected on Tuesday (Jul 14) at 8PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful11PM (Sun 12th Jul)7ft (2.2m) 8s

Table - best surf conditions forecast for Ammonias over the next 16 days.


Alright folks, Rusty here. Let’s break down what’s coming at Ammonias for the next couple of weeks. I’ll keep it real – it’s a rough patch. The entire 16-day window is filled with cross-chop, lumpy conditions, and onshore slop. There isn’t a single session I’d call good. This reef needs a clean SSE swell to really shine, but instead we’re stuck with constant ENE windswell. That’s a direction mismatch, and the wind is nearly always cross or cross-onshore, so the wave face is gonna be all chopped up.

The first week, from July 10 right through July 17, is pretty much a washout. Every morning and afternoon gets a score of zero or one at best. Swell heights sit between 5 ft and 7 ft, but with short period of 7–8 seconds and fresh cross-winds, it’s just messy, bumpy stuff. Combined wave energy is moderate (400–888), but that energy is all wind-chop. Even the mornings with a score of one – like July 10 morning (7 ft, ENE, cross wind, energy 524) or July 13 morning (6 ft, ENE, cross, energy 726) – are still marginal because of tide and wind. No glassy windows. The afternoon of July 15 sees a weird shift: a 2 ft swell from the SSW with a long 18-second period, but it’s still cross-shore and energy moderate (529). That tiny groundswell would be too weak to break well on a reef, especially with that wind.

The second week, from July 18 onward, the swell drops further. Heights range from 2 ft to 3 ft, and periods go longer (13–21 seconds) but those SSW and S swells aren’t aligned with the optimum SSE direction. Combined energy stays moderate – in the 200–500 range for most days. July 24 morning shows a 3 ft SSW swell with 18-second period and energy 720 – that’s the best of the window, but still marginal (score 1). Cross-wind at 12 mph won’t kill it completely, but the reef will be small and inconsistent. Don’t expect clean walls.

Honestly, no standout session here. If you had to pick the least ugly slot, I’d scratch out the morning of July 24 – that longer-period SSW groundswell might offer a few clean but tiny waves before the wind picks up. But it’s a long shot. The lack of any decent wind and the wrong swell direction mean this is a 16-day dry spell. Ammonias is usually fairly consistent, so this is a tough run – but forecasts can change, so keep an eye out.

Stay patient, Rusty.

Short Range Forecast

Moderate rain (total 18mm), heaviest on Sun morning. Warm (max 25°C on Thu night, min 24°C on Thu night). Mainly fresh winds.

Days 5-7 Weather Summary

Moderate rain (total 15mm), heaviest on Sun night. Warm (max 26°C on Wed afternoon, min 23°C on Sun night). Wind will be generally light.

Friday
10
Saturday
11
Sunday
12
Monday
13
Tuesday
14
Wednesday
15
Thu
16
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Rating
(10 max)
0
1
0
0
0
0
0
0
0
0
1
1
1
1
0
1
0
1
0
0
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
2.1
ENE
7
2
ENE
7
1.8
ENE
7
2.1
ENE
7
2.1
ENE
7
2
ENE
7
2.1
ENE
7
1.9
ENE
7
2.1
ENE
8
2.1
ENE
8
1.9
ENE
8
1.6
ENE
8
1.7
ENE
7
1.6
ENE
7
1.5
ENE
8
1.5
ENE
7
1.7
ENE
7
0.6
SSW
18
0.8
SSW
16
0.6
SSW
16
0.6
SSW
17
Wave Graph
Metric surfscale
Energy kJ
468
426
340
397
444
394
449
382
517
514
400
288
293
263
257
250
279
216
314
179
195
Wind (km/h)
25
ENE
25
ENE
30
ENE
25
ENE
30
ENE
30
NE
25
ENE
25
ENE
30
ENE
25
ENE
25
ENE
25
NE
20
ENE
20
ENE
25
ENE
20
ENE
20
ENE
20
ENE
20
E
20
ENE
20
ENE
Wind State
cross-on
cross
cross
cross
cross
cross
cross
cross-on
cross
cross
cross
cross
cross
cross
cross
cross
cross-on
cross
cross-on
cross-on
cross
High Tide
9:34PM0.22m
1:33PM0.67m
11:46PM0.18m
2:19PM0.73m
1:06AM0.18m
3:04PM0.77m
2:08AM0.19m
3:47PM0.78m
3:04AM0.21m
4:29PM0.77m
3:58AM0.23m
5:08PM0.73m
4:55AM0.26m
5:45PM0.67m
Low Tide
9:16PM0.22m
5:17AM-0.06m
9:34PM0.17m
6:09AM-0.08m
10:03PM0.14m
7:03AM-0.10m
10:34PM0.12m
7:55AM-0.11m
11:06PM0.11m
8:46AM-0.10m
11:38PM0.10m
9:34AM-0.07m
00:10AM0.09m
10:22AM-0.02m
rain showers
rain showers
rain showers
rain showers
part cloud
rain showers
rain showers
rain showers
rain showers
rain showers
part cloud
clear
rain showers
clear
rain showers
rain showers
rain showers
clear
rain showers
rain showers
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:00
6:01
6:01
6:01
6:01
6:01
6:03
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:23
7:23
7:23
7:23
7:23
7:22
7:22
7:22
 mm
1
1
2
1
2
4
3
4
4
1
3
5
2
5
4
1
Temp °C
25
25
25
24
25
25
24
25
25
24
25
25
24
25
25
24
25
26
24
25
26
Feels °C
24
24
24
23
24
24
23
24
24
23
23
23
23
24
24
23
24
25
24
25
26
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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Information about the Ammonias Surf forecast

The above surf forecast table for Ammonias provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Ammonias can be found by selecting the local surf guide option on the grey menu. Our Ammonias surf forecast is unique since it includes wave energy (power) that defines the real feel of the surf rather than just the height or the period. If you surf the same spot (Ammonias) regularly then make a mental note of the wave energy from the surf forecast table each time you go. Very soon you may start to choose your surf days based on the wave energy alone combined with our forecast of favourable offshore wind conditions. Our star ratings will help here and of course you will also find the usual wave height and period predictions on our surf forecasts as well as a full break down of the swell components under our advanced users option (to reveal that, click the little Einstein character under the tide times).

Further information to help with frequently asked questions about our surf forecast for Ammonias may be found under the help tab on the top menu and also by moving your mouse over the question marks on the surf forecast table itself. Please always bear in mind that the forecast is for near-shore open water and local factors at each surf break influence the actual breaking wave height, such as the beach / reef profile, water depths offshore and shelter.

Are you planning a vacation in Kaua'i? If you are looking for accommodation near Ammonias, camping, hotels and condos and appartments in Kaua'i, consider staying in Nawiliwili which is 2 km (1 miles) away. Alternatively, find information about places to stay and car hire in Lihue - Kauai which is 3 km (2 miles) away

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