Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 1 pm 02 Sep 2026 (local time)

Forecast update in  hr  min

Today's Ammonias sea temperature is
27.2°C
0.3° 

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: Tuesday 8 Sep, 5AM (local time) - 23ft (7.0m), 15s period, S swell with onshore winds.
  • Most powerful swell: Tuesday 8 Sep, 8AM (local time) - 36ft (11.0m), 14s period, S swell with 49,542 kJ wave energy.
  • Next surfable swell (1★+): Tuesday 8 Sep, 5AM (local time) - 23ft (7.0m), 15s period with S 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 Tuesday (Sep 08) at 5AM. The primary swell is predicted to be 7.0m and 15s period with a secondary swell of 4.5m and 9s. The wind is predicted to be onshore as the swell arrives.

The most powerful waves expected at Ammonias in the next 16 days are 11.0m 14s and forecast to arrive on Tuesday (Sep 08) at 8AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 9s period and expected on Wednesday (Sep 09) at 2AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+) 5AM (Tue 8th Sep)23ft (7.0m) 15s
Best Surf 5AM (Tue 8th Sep)23ft (7.0m) 15s
Most Powerful 8AM (Tue 8th Sep)36ft (11.0m) 14s

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


The Lowdown

G’day, I’m Rusty. Let’s break down what’s on the cards at Ammonias over the next couple of weeks.

Right from the start, the first few days are nothing to write home about. Wednesday the 2nd and Thursday the 3rd have cross-shore winds around 25 km/h and surf running about 7 ft, but there’s a messy cross-chop on the surface. The combined swell energy’s in the moderate range (949 to 1386), but the quality’s lacking – it’s a bit of a wrestle out there. Water temp’s 81°, which is about average for this time of year.

Friday the 4th through Sunday the 6th are more of the same: wave heights between 5 ft and 7 ft, but the wind’s still cross or cross-on, and the reports keep calling it marginal. The energy climbs into moderate territory (1152 to 1775), but it’s not clean enough to get stoked about. Monday the 7th sees the swell bump up to 8 ft with a longer period (14 seconds), and the energy hits the strong range (4690 to 5815), but the wind’s still cross and it’s labelled marginal – a bit of a tease.

Now, Tuesday the 8th is the big one, but only for the hardcore. The morning brings a massive 31 ft swell from the south with a 13-second period and a cross-onshore near gale of 34 mph. The combined energy is extreme (31474), but the report flat out says it’s too big for this break. That’s expert-only territory, and it’s blown out. The afternoon drops to 13 ft but the wind’s still cross and messy. Not a day for a paddle; might be interesting for kiting though.

After that, things settle down. Wednesday the 9th has a 5 ft swell with cross-on wind, Thursday the 10th is small and choppy, and the energy falls off (532 to 619). Friday the 11th shows a slight bump to 6 ft with a 13-second period and cross-on breeze – still not clean. The energy’s moderate (1328), but the wind’s not playing nice.

From Saturday the 12th onward, it’s pretty flat. Waves drop below 3 ft by Monday the 14th, and the energy gets weak (94 to 233). The second week is a dud for decent surf – small, cross-wind, and mostly poor conditions. Even the longer-period swells (up to 21 seconds on the 15th) are tiny, so there’s no power.

The only real standout is Tuesday the 8th morning, but that’s a huge, dangerous swell with howling wind – not for the average surfer. If you’re an expert chasing a wild one, it’s worth a look, but don’t expect it to be clean. The rest of the window is pretty forgettable.

Rusty.

Short Range Forecast

Light rain (total 6mm), mostly falling on Wed afternoon. Warm (max 26°C on Wed afternoon, min 24°C on Thu night). Mainly fresh winds.

Days 5-7 Weather Summary

Heavy rain (total 95mm), heaviest during Mon night. Warm (max 26°C on Sat afternoon, min 23°C on Mon morning). Winds increasing (light winds from the ESE on Sun night, severe gales from the SE by Mon night).

Wed
2
Thursday
3
Friday
4
Saturday
5
Sunday
6
Monday
7
Tuesday
8
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
2
1
1
1
1
1
1
1
1
2
1
1
0
2
3
0
!
0
2
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
2
ENE
8
2.1
ENE
8
1.5
SE
13
1.5
SSE
12
1.3
SSE
12
1.3
SSE
11
1.4
SSE
12
1.5
S
12
1.6
S
12
2.2
ENE
13
2.2
ENE
13
2.1
SSW
13
2.3
ENE
12
2.5
SSW
14
3
ENE
13
5
SSW
15
9.5
S
13
4
SW
9
1.9
S
9
Wave Graph
Metric surfscale
Energy kJ
487
486
507
734
626
477
428
514
639
722
1679
1605
1445
1511
2536
2991
11445
30466
2989
588
Wind (km/h)
25
ENE
25
ENE
25
NE
25
NE
25
ENE
30
ENE
30
NE
25
NE
25
ENE
30
NE
25
NE
25
ENE
25
ENE
20
E
25
ENE
30
ENE
70
E
55
SSW
35
SW
20
SW
Wind State
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross-on
cross
cross
cross-on
cross-on
cross
cross
High Tide
5:17PM0.30m
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
Low Tide
3:05PM0.29m
1:01AM0.04m
2:01AM0.05m
3:24AM0.06m
8:23PM0.17m
8:30PM0.15m
6:02AM0.04m
8:46PM0.13m
7:02AM0.02m
9:05PM0.11m
rain showers
rain showers
part cloud
cloud
rain showers
rain showers
clear
clear
clear
rain showers
rain showers
rain showers
rain showers
thunderstorm
heavy rain
mod rain
thunderstorm
thunderstorm
rain showers
rain showers
<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
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:52
6:52
6:51
6:50
6:49
6:47
6:46
 mm
3
1
1
1
1
3
1
2
11
15
6
48
8
2
1
Temp °C
26
25
26
26
25
25
26
25
26
26
25
26
26
25
23
24
26
26
26
26
Feels °C
26
25
25
24
23
23
23
23
25
25
24
25
25
24
23
23
20
17
23
26
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  • 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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