Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 7 pm 21 Aug 2026 (local time)

Forecast update in  hr  min

Today's Ammonias sea temperature is
26.5°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 22 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. The largest open ocean swell (not directed at the beach) is 0.6m 10s period and expected on Saturday (Aug 22) at 8AM.

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

Right, let’s have a look at what’s cookin’ at Ammonias over the next couple of weeks. First thing first – there’s no surf worth paddling for right this minute, and honestly, it’s gonna be a bit of a wait. We’re staring at a long gap here, with barely a score worth getting wet for until we get deep into the first week of September. For a reef setup like this, that’s pretty normal when the trade winds lock in and the swell angles stay unfavourable. Hang tight.

Starting things off on Saturday the 22nd of August, we’ve got a modest 2ft SW groundswell rolling in with a long 16-second period. That’s a proper long-period groundswell with moderate energy (515) but the cross-on wind from the ENE at 12 mph is mucking it up – choppy, poor conditions. Not one to chase.

Through the rest of August, the swell picks up a bit but the wind stays cross or cross-on, mostly from the ENE at 12–16 mph. On Sunday the 23rd, there’s 6ft from the east with a short period of 7 seconds – weak, lumpy, no shape. That’s more of a messy beach-break vibe than a reef wave. The combined energy nudges into the moderate range (681) but it’s still marginal at best.

The story doesn’t really change through the end of the month. We get pulses of longer-period S and SSW swell around the 26th and 27th – 2ft to 3ft at 14–18 seconds – but that cross-shore wind keeps it average. The energy climbs a bit – up to 759 on the Thursday morning – but it’s still just marginal. The reef likes a cleaner window, and it’s not getting one.

Toward the start of September, we start to see a shift. On Tuesday the 1st of September, the morning is still cross-shore with a 6ft ENE swell at 10 seconds (strong energy, 1196), but by the afternoon the wind goes cross-off from the NNE at 12 mph, and the swell drops to 6ft – cleaner, but only a marginal score. Then we hit the standout.

Wednesday the 2nd of September is the best we’re gonna get. Morning session sees a 3ft S groundswell with a long 17-second period, light cross-off breeze from the NNE at 9 mph, and the wave comment says “expect very good surf conditions” – that’s gold. The combined energy is moderate (604). By the afternoon it gets even lighter, with a 6 mph cross-off breeze and 3ft S swell at 16 seconds, energy up to 709. This is clean, glassy, proper reef-swell stuff. This is the one to circle.

After that, we fade back into marginal and poor conditions again from Thursday the 3rd onward – cross-on winds, 6–7ft short-period ENE swell, and the usual chop. The last bit on Sunday the 6th of September is just poor with moderate cross-on wind.

So, the takeaway? If you’re keen on Ammonias, wait for Wednesday the 2nd of September. That’s the clear standout. The rest of the window is mostly a write-off – a long, frustrating gap with only that one real highlight.

Rusty.

Short Range Forecast

Moderate rain (total 13mm), heaviest on Mon morning. Warm (max 27°C on Sat morning, min 25°C on Sat night). Wind will be generally light.

Days 5-7 Weather Summary

Light rain (total 5mm), mostly falling on Mon night. Warm (max 27°C on Tue afternoon, min 24°C on Wed night). Wind will be generally light.

Saturday
22
Sunday
23
Monday
24
Tuesday
25
Wednesday
26
Thursday
27
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
0
1
1
1
0
1
0
0
1
0
1
1
1
1
1
1
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)
0.8
SSW
16
0.7
SW
16
1.7
ENE
7
1.8
ENE
7
1.7
E
7
1.6
ENE
7
0.7
SSW
14
0.7
SSW
14
0.7
SSW
13
1.5
E
7
1.6
E
6
1.6
ENE
7
1.6
E
7
0.7
SSW
14
0.8
S
18
0.9
S
19
1
S
17
1
S
17
1.1
S
15
Wave Graph
Metric surfscale
Energy kJ
322
261
251
336
303
247
218
218
167
200
220
247
240
215
395
573
579
553
567
Wind (km/h)
15
ENE
20
ENE
25
ENE
25
ENE
25
ENE
25
ENE
25
ENE
25
ENE
25
ENE
20
ENE
20
ENE
20
ENE
20
ENE
20
ENE
20
ENE
20
NE
20
ENE
20
ENE
20
E
Wind State
cross-on
cross-on
cross
cross
cross
cross
cross
cross-on
cross
cross
cross-on
cross
cross
cross
cross
cross
cross
cross
cross-on
High Tide
11:30PM0.20m
1:07PM0.59m
00:35AM0.22m
1:46PM0.62m
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
Low Tide
9:24PM0.19m
9:13PM0.18m
5:45AM0.08m
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
clear
clear
clear
clear
clear
clear
rain showers
thunderstorm
thunderstorm
thunderstorm
thunderstorm
clear
part cloud
part cloud
clear
clear
part cloud
part cloud
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:16
6:16
6:16
6:18
6:18
6:18
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:02
7:01
7:01
7:00
7:00
6:59
6:58
 mm
4
5
4
4
1
1
Temp °C
26
27
27
25
26
27
25
26
27
25
26
27
25
26
26
25
26
26
25
Feels °C
29
29
28
26
26
27
25
27
28
26
27
28
26
25
25
25
26
26
26
  • 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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