Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 7 pm 28 Aug 2026 (local time)

Forecast update in  hr  min

Today's Ammonias sea temperature is
27.3°C
0.4° 

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


Ammonias surf forecast from 29 Aug 2026:

  • Most powerful swell: Saturday 5 Sep, 2AM (local time) - 4.5ft (1.4m), 12s period, ENE swell with 598 kJ wave energy.

Best Forecast Surf Conditions for Ammonias this week:

The most powerful waves expected at Ammonias in the next 16 days are 1.4m 12s and forecast to arrive on Saturday (Sep 05) at 2AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 7s period and expected on Friday (Sep 04) at 11PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 2AM (Sat 5th Sep)4.5ft (1.4m) 12s

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


The Lowdown

Alright, Rusty here. Let’s have a look at the forecast for Ammonias.

This stretch of water is a reef break, so it’s got that exposed, raw feel, and it’s fairly consistent. The water temperature is bang on average for this time of year, so no surprises there. The optimum swell direction is from the SSE. The problem is, we just aren’t getting that for a good chunk of the outlook.

The first few days – Saturday the 29th and Sunday the 30th – are a write-off. We’re looking at a messy cross and cross-onshore wind from the ENE at 16 mph, with a short, weak swell. The wave energy is stuck in the moderate range (566 to 707), and the surf is just poor. You’d be fighting a chop the whole time, and it’s not worth it.

Monday the 31st and Tuesday the 1st are pretty much the same story. The wind is still a cross-offender, and the swell is a short-period ENE windswell, around 6 ft. Energy is climbing a bit (738 to 915), but it’s still poor, choppy, and messy. Tuesday morning sneaks a marginal score, but honestly, it’s a “maybe if you’re desperate” situation.

Wednesday the 2nd is a weird one. The morning is more of the same ENE windswell, but by the afternoon, a long-period S swell shows up at 3 ft with a 16-second period. That is a proper groundswell. The energy is moderate (818), and the wind is still cross, so it’s not clean, but for a reef break, that long period could wrap in and give you some cleaner lines if the tide plays ball. It’s a marginal call, but the most interesting moment so far.

Thursday the 3rd and Friday the 4th are back to the same old cross-shore ENE wind and a mix of small SSE groundswell and short ENE windswell. Energy is dropping (601 to 535), and the surf is just flat and choppy.

Saturday the 5th sees a bit of a pulse. A 5 ft ESE swell with a period of 12 seconds – that’s a more solid groundswell setup. Energy is up to 829. The wind is still cross, so it’s not perfect, but it’s the first session that’s worth a paddle. The 5 ft is a good size for intermediates, and the longer period means better shape.

Then we hit a blank spot from Sunday the 6th through to Wednesday the 9th. The surf is either poor or marginal, with a choppy mess. The energy is all over the place, but the wind is always a cross-on or cross-offence. It’s not a good run.

Now, here’s where it gets interesting. Thursday the 10th of September morning, the wind drops to a light breeze from the E at 6 mph. The swell is 5 ft from the ENE, with a short period (8 seconds). The energy is moderate (639). It’s a cross-onshore wind, but it’s light – so the surf will be a little bumpy but not blown out. For a reef break, that’s a solid session for intermediates. The afternoon looks similar, with a 6 ft swell. This is the best window of the whole outlook.

Friday the 11th is a step back. The wind picks up a bit, and the swell drops to a tiny 3 ft from the SSW with a long period (16 seconds). That’s a groundswell, but it’s small, and the wind is cross-onshore. Not great.

The last two days – Saturday the 12th and Sunday the 13th – are a return to the choppy, cross-onshore ENE windswell. Energy is very low (181 to 420), and the surf is poor. Not worth the drive.

The standout is Thursday the 10th of September. The morning and afternoon both offer a solid 5 ft to 6 ft ENE swell with light cross-onshore wind. The energy is moderate, and the reef will handle the short period better than a beach break. It’s the cleanest, most surfable window in the entire 16-day period. The crowds are listed as “often” at this spot, so expect company, but the conditions should be good enough that it’s worth it.

For the rest, it’s mostly a waiting game.

Rusty.

Short Range Forecast

Light rain (total 8mm), mostly falling on Sat morning. Warm (max 27°C on Sun afternoon, min 25°C on Fri night). Mainly fresh winds.

Days 5-7 Weather Summary

Moderate rain (total 10mm), heaviest on Wed morning. Warm (max 26°C on Tue morning, min 25°C on Mon night). Wind will be generally light.

Saturday
29
Sunday
30
Monday
31
Tuesday
1
Wednesday
2
Thursday
3
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
0
0
0
0
0
0
0
0
1
1
0
1
1
1
1
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)
0.9
S
14
0.8
S
13
1.6
ENE
7
2
ENE
7
1.9
ENE
7
1.8
ENE
7
1.9
ENE
7
1.9
ENE
7
1.8
ENE
8
2
ENE
8
1.9
ENE
8
1.9
ENE
8
2
ENE
8
1.9
ENE
8
0.9
S
16
1.7
ENE
8
1.7
ENE
8
1.5
ENE
8
1.3
ENE
8
Wave Graph
Metric surfscale
Energy kJ
294
215
215
383
365
330
356
379
353
451
421
443
499
454
406
352
322
244
186
Wind (km/h)
20
ENE
25
ENE
25
ENE
25
ENE
25
ENE
25
ENE
25
ENE
20
ENE
25
ENE
20
ENE
25
ENE
25
NE
25
ENE
25
ENE
25
ENE
20
NE
20
ENE
20
ENE
15
NE
Wind State
cross-on
cross-on
cross
cross
cross
cross
cross-on
cross-on
cross
cross
cross
cross
cross
cross
cross
cross
cross-on
cross
cross
High Tide
4:22AM0.42m
4:25PM0.55m
5:07AM0.46m
4:47PM0.49m
5:58AM0.49m
5:08PM0.42m
6:57AM0.52m
5:24PM0.35m
8:09AM0.55m
5:17PM0.30m
9:35AM0.57m
Low Tide
10:29PM0.08m
10:02AM0.10m
10:52PM0.06m
10:51AM0.15m
11:17PM0.04m
11:48AM0.20m
11:45PM0.03m
1:02PM0.26m
00:18AM0.03m
3:05PM0.29m
1:01AM0.04m
2:01AM0.05m
clear
rain showers
rain showers
rain showers
clear
clear
rain showers
rain showers
clear
clear
clear
part cloud
rain showers
rain showers
rain showers
rain showers
part cloud
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:18
6:18
6:20
6:20
6:20
6:20
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:57
6:55
6:54
6:54
6:53
6:52
6:52
 mm
1
1
3
2
1
2
3
3
2
Temp °C
25
26
26
25
26
27
26
26
27
25
26
26
25
26
26
25
26
26
25
Feels °C
24
25
25
25
25
26
26
26
26
24
25
25
24
26
25
25
26
26
25
  • Map Icons:
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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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