Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 1 am 03 Sep 2026 (local time)

Forecast update in  hr  min

Today's Ammonias sea temperature is
27.1°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 3 Sep 2026:

  • Best quality surf: Monday 7 Sep, 5PM (local time) - 34ft (10.5m), 15s period, SSE swell with cross-onshore winds.
  • Most powerful swell: Monday 7 Sep, 8PM (local time) - 43ft (13.0m), 15s period, S swell with 68,896 kJ wave energy.
  • Next surfable swell (1★+): Monday 7 Sep, 5PM (local time) - 34ft (10.5m), 15s period with SSE swell.

Best Forecast Surf Conditions for Ammonias this week:

The surf forecast for Ammonias over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Sep 07) at 5PM. The primary swell is predicted to be 10.5m and 15s period. The wind is predicted to be cross-onshore as the swell arrives.

The most powerful waves expected at Ammonias in the next 16 days are 13.0m 15s and forecast to arrive on Monday (Sep 07) at 8PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.2m 7s period and expected on Tuesday (Sep 08) at 5AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+) 5PM (Mon 7th Sep)34ft (10.5m) 15s
Best Surf 5PM (Mon 7th Sep)34ft (10.5m) 15s
Most Powerful 8PM (Mon 7th Sep)43ft (13.0m) 15s

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


The Lowdown

Alright, Rusty here. Let’s talk about what’s on offer for Ammonias.

Honestly, the next few days at Ammonias are going to be a test of patience. For Thursday and Friday of this week, we've got knee-to-waist high swell, around 4ft to 5ft from the SE, but the wind is a cross-shore mess at 15 to 19 mph, making everything lumpy and choppy. The water's sitting at a warm 81°, but the wave energy is actually quite strong (1310 to 1272) despite the poor conditions. It’s not what you’d call surfable right now, so save your energy.

Saturday isn't much different, still that 5ft range with cross-shore wind. The energy picks up to 1596 to 1663, but it's still that same rough, lumpy ocean.

Then on Sunday, things get real heavy. The swell jumps to 8ft from the ENE, but the wind swings cross-onshore, and the energy rockets up to 3453. This is not your day. Monday gets even more intense, with a 34ft monster from the SSE, period of 15 seconds, and near gale-force winds at 37 mph. That's a terrifying 50324 wave energy value. Unless you're a world-class big wave charger with a jet ski, stay well away. That setup is way too big for any normal paddle session here.

By Tuesday the 8th, it drops back down to a more manageable 6ft from the ENE, but the wind is still cross-shore, and the surf looks marginal. The afternoon does improve slightly with a 3ft SSW groundswell (14-second period) and lighter wind, but it's still just okay, not great.

Wednesday the 9th sees the swell bottom out at 3ft, so the only thing worth getting in the water for is maybe a longboard if you have nothing else to do.

Looking further out, from the 10th to the 14th, we get a mixed bag. You'll see some waist to chest-high sets (5ft to 7ft), but the period drops to a short, weak 7-8 seconds, meaning the waves will be fat and lack punch. The wind remains a persistent cross or cross-onshore breeze. There’s one window on the afternoon of Sunday the 13th where we get a clean, cross-off wind, which is promising for a small, lined-up wave, but the energy is low (631).

The absolute best bet in this entire 16-day window is a toss-up, but if I had to pick one, it’s the Tuesday afternoon of the 8th. The swell is small (3ft) but it has a long 14-second SSW groundswell that will wrap in nicely. The wind is a gentle cross-shore, and while the wave energy is still strong (1251), it’s the most manageable and cleanest of the early days. Still, it’s a "diamond in the rough" kind of session, not a standout. For a real standout, look to the end of the second week. On Tuesday the 15th, we get a very long 21-second SSW groundswell, but it’s only 3ft. That long period means it’ll be super clean and have more push than the size suggests, but the on-shore wind from the ESE will mess up the surface. A real tease.

All in all, Ammonias is going through a rough patch. If you're desperate, the afternoon of the 8th is your only real shot before the big, blown-out swell hits, and then it's a long, marginal grind until the end of the window.

Rusty.

Short Range Forecast

Light rain (total 9mm), mostly falling on Thu afternoon. Warm (max 26°C on Thu morning, min 24°C on Thu night). Mainly fresh winds.

Days 4-6 Weather Summary

Heavy rain (total 65mm), heaviest during Mon afternoon. Warm (max 28°C on Tue afternoon, min 24°C on Sun night). Winds decreasing (stormy winds from the SSE on Mon night, calm by Tue night).

Thursday
3
Friday
4
Saturday
5
Sunday
6
Monday
7
Tuesday
8
Wednesday
9
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
1
1
0
1
1
1
1
1
2
0
0
0
0
!
0
2
3
3
2
0
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
2
ENE
8
1.4
SE
12
1.3
SSE
11
1.4
SSE
12
1.4
SSE
12
1.3
SSE
12
1.2
E
14
1.6
S
12
1.8
S
12
2.5
ENE
13
2.3
SSW
13
3
SSW
14
3.5
SSW
15
11
SSE
15
4.5
SW
10
1.7
ENE
11
1
SSW
14
0.9
SSW
14
0.9
SSW
14
0.9
SSW
13
1.6
ENE
7
Wave Graph
Metric surfscale
Energy kJ
480
549
404
557
522
486
560
710
933
2028
1739
3025
5534
50324
4149
744
449
356
341
257
252
Wind (km/h)
25
NE
30
NE
25
ENE
30
NE
30
NE
25
NE
25
ENE
25
NE
25
ENE
25
ENE
25
E
25
ENE
35
ENE
60
E
65
SSW
20
SW
15
SSW
0
SSW
10
ENE
20
ENE
20
ENE
Wind State
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross-on
cross-on
cross-on
cross
cross-on
cross
cross
cross
glassy
cross
cross-on
cross-on
High Tide
9:35AM0.57m
10:57AM0.61m
12:04PM0.65m
11:37PM0.20m
12:57PM0.68m
00:45AM0.25m
1:42PM0.69m
1:36AM0.30m
2:20PM0.68m
2:21AM0.36m
2:54PM0.66m
3:04AM0.41m
Low Tide
2:01AM0.05m
3:24AM0.06m
8:23PM0.17m
8:30PM0.15m
6:02AM0.04m
8:46PM0.13m
7:02AM0.02m
9:05PM0.11m
7:55AM0.03m
9:25PM0.09m
part cloud
rain showers
rain showers
rain showers
clear
rain showers
clear
part cloud
rain showers
rain showers
thunderstorm
mod rain
mod rain
thunderstorm
thunderstorm
rain showers
clear
clear
clear
clear
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:20
6:20
6:20
6:20
6:22
6:22
6:22
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:52
6:51
6:50
6:49
6:47
6:46
6:45
 mm
1
1
2
2
3
1
7
10
7
18
20
2
Temp °C
26
26
25
25
26
25
26
26
25
26
27
25
25
26
26
27
28
26
27
27
26
Feels °C
25
24
23
24
23
23
25
25
25
26
27
24
23
21
17
28
29
30
30
30
27
  • 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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