Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 1 pm 23 Aug 2026 (local time)

Forecast update in  hr  min

Today's Ammonias sea temperature is
26.8°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 24 Aug 2026:

  • Most powerful swell: Thursday 27 Aug, 2PM (local time) - 3.5ft (1.1m), 17s period, S swell with 702 kJ wave energy.

Best Forecast Surf Conditions for Ammonias this week:

The most powerful waves expected at Ammonias in the next 16 days are 1.1m 17s and forecast to arrive on Thursday (Aug 27) at 2PM. Winds are predicted to be cross-shore at the time the swell arrives.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 2PM (Thu 27th Aug)3.5ft (1.1m) 17s

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


The Lowdown

Alright, gather 'round the fire, let's talk swell. This is Rusty, and I've been staring at the charts for our little corner of the world. Gotta be straight with you – for the here and now, and for a good stretch, it's a waiting game. The whole 16-day window is a bit of a slow burn, with a whole lot of frustrating days before we finally see some real muscle.

First up, we're looking at Ammonias. The water's sitting around 80°, which is pretty much normal for this time of year, so no surprises there. The real story starts with a whole lot of nothing. From Sunday the 23rd right through to the end of August, it's a grim scene. We've got a consistent cross-shore breeze, mostly from the ENE, that's just ruining the surface. The swell is a mix of short-period, weak windswell from the ENE, with heights around 6 ft to 6 ft, but the period is a miserable 6 to 7 seconds. The combined energy is moderate, hitting the 500s and 600s, but it's all junk. The wind state is cross or cross-on, creating a lumpy, choppy mess. It's just not worth paddling out.

Then, there's a big gap. The first few days of September (1st to 3rd) are still marginal at best, with a mix of rain and storms. You'll see a pulse of moderate energy (over 1100) on the 1st and 2nd, but it's still short-period ENE windswell. The wind is still cross-shore, so it's messy. The best you can hope for is a wave that's a bit fat and won't hold up.

Now, hold on, because the end of the forecast window starts to look a bit more interesting. On the 5th of September, we finally see a change. The swell direction swings to ENE, and the period jumps to 12 seconds – that's a proper groundswell on the way. The combined energy is strong, hitting 1303 on Saturday morning, building to 1404 in the afternoon. Swell heights are around 6 ft to 7 ft. The wind is still cross-shore from the NE, so it won't be glassy, but it's a massive improvement. This is the first real standout on offer.

Then, Sunday the 6th of September is the daddy of the run. The swell holds at 7 ft in the morning, building to a solid 10 ft by the afternoon, with a 12-second period. The energy is massive, peaking at 3140. That's a serious amount of water moving. The wind is still a moderate cross-shore from the NE and ENE. This is big, powerful, and for the experienced crew, absolutely worth the wait. It's going to be a proper session, but that 10 ft swell is expert territory.

Monday the 7th sees the energy drop slightly, but still strong at over 1600. The swell is still 8 ft with a 10-second period, but the wind swings ENE and becomes cross-on in the morning, so it's a bit choppier. The afternoon cleans up again with a NE cross-shore.

So, the long and short of it: the first two weeks are a write-off. The best bet is to circle Saturday the 5th and Sunday the 6th of September at Ammonias. Sunday the 6th is the standout, with that big, powerful groundswell from the ENE, but it's for the advanced crowd only. The wind won't be perfect, but it's clean enough to handle that much energy. Stay patient, and keep your eyes on the end of the forecast.

Rusty.

Short Range Forecast

Light rain (total 7mm), mostly falling on Mon night. Warm (max 27°C on Sun afternoon, min 24°C on Tue night). Mainly fresh winds.

Days 5-7 Weather Summary

Light rain (total 7mm), mostly falling on Thu morning. Warm (max 26°C on Wed afternoon, min 24°C on Wed night). Wind will be generally light.

Sun
23
Monday
24
Tuesday
25
Wednesday
26
Thursday
27
Friday
28
Saturday
29
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
1
0
1
1
0
1
1
0
1
1
1
1
1
0
1
0
0
1
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.7
ENE
7
1.9
ENE
7
1.6
ENE
7
1.6
ENE
6
1.6
E
6
1.7
ENE
6
1.9
E
7
1.7
E
7
1.8
E
7
0.8
S
18
0.9
S
19
1.1
S
17
1
S
17
1.1
S
15
0.9
S
14
1
S
14
0.9
S
14
1.6
ENE
7
0.8
S
13
1.8
ENE
7
Wave Graph
Metric surfscale
Energy kJ
257
316
232
200
220
253
351
270
306
395
573
699
553
567
334
394
294
247
215
278
Wind (km/h)
30
NE
25
NE
25
ENE
25
ENE
20
ENE
25
ENE
25
ENE
20
ENE
25
ENE
25
NE
25
NE
25
ENE
20
NE
20
ENE
20
ENE
25
ENE
20
ENE
25
ENE
25
ENE
25
ENE
Wind State
cross
cross
cross
cross
cross
cross-on
cross
cross
cross-on
cross
cross
cross
cross
cross
cross
cross
cross-on
cross-on
cross
cross-on
High Tide
1:16AM0.25m
2:19PM0.63m
1:51AM0.28m
2:48PM0.64m
2:25AM0.31m
3:14PM0.64m
3:02AM0.35m
3:38PM0.62m
3:40AM0.38m
4:02PM0.59m
4:22AM0.42m
4:25PM0.55m
Low Tide
9:16PM0.18m
6:37AM0.05m
9:23PM0.17m
7:21AM0.04m
9:34PM0.16m
8:01AM0.03m
9:50PM0.13m
8:40AM0.04m
10:08PM0.11m
9:19AM0.06m
10:29PM0.08m
10:02AM0.10m
10:52PM0.06m
clear
part cloud
thunderstorm
clear
thunderstorm
rain showers
clear
clear
clear
clear
part cloud
rain showers
rain showers
rain showers
rain showers
rain showers
rain showers
part cloud
clear
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:16
6:18
6:18
6:18
6:18
6:18
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:01
7:00
7:00
6:59
6:58
6:57
6:55
 mm
2
4
1
1
1
2
1
1
1
1
Temp °C
27
25
27
27
26
26
27
25
26
26
25
26
26
25
26
26
25
26
26
25
Feels °C
26
25
27
28
28
26
27
25
25
25
24
26
25
26
26
25
25
24
24
25
  • 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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