Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 7 pm 19 Aug 2026 (local time)

Forecast update in  hr  min

Today's Ammonias sea temperature is
26.4° 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 20 Aug 2026:

  • Most powerful swell: Wednesday 26 Aug, 5PM (local time) - 2.5ft (0.8m), 18s period, S swell with 395 kJ wave energy.

Best Forecast Surf Conditions for Ammonias this week:

The most powerful waves expected at Ammonias in the next 16 days are 0.8m 18s and forecast to arrive on Wednesday (Aug 26) at 5PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 7s period and expected on Friday (Aug 21) at 5AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 5PM (Wed 26th Aug)2.5ft (0.8m) 18s

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


The Lowdown

Alright, let’s get real about the next couple of weeks. It’s a bit of a rough stretch, I ain’t gonna lie. We’re looking at a long, dry spell of proper surf. The models are showing plenty of ocean movement, but it’s mostly messy, onshore energy and not the clean, groomed lines we want.

The first week is a write-off for anything decent. We’re looking at a solid gap with no quality waves on the cards. There’s a pulse of short-period, wind-blown swell around the 23rd to the 25th, with sizes getting up to 6.2ft, but the wind is gonna be howling from the NE at 18.6 mph, making a complete mess of it. The energy is there, moderate to strong (671), but it’s all chop and no shape. This will be more interesting for the kite crew than for us paddle surfers.

Through the 26th and 27th, the swell drops back down and some longer period energy tries to push in, but the NE wind keeps it onshore and junky. It’s not until the end of the month, around August 31st and into September 1st, that we see a bit of an increase in size again, with swell pushing 7.2ft. The energy is strong (1772), and the period is a bit better at 13 seconds, but it’s still cross-shore winds messing with the surface. It’s frustrating, to be honest.

Ammonias is a reef break that’s fairly consistent, so it’s not like it never breaks, but this forecast is a real test of patience. None of these days are looking like standouts. Even the bigger pulses are marred by wind and poor conditions. It’s not until the very end of the forecast window, into the 3rd and 4th of September, that we see some cleaner potential with the wind dropping to a gentle breeze. There’s a promising swell due from the SSW with a very long period of 20 seconds, and the energy is solid (977). That’s the one bright spot, but it’s a long way out and long-period swells can be tricky at reefs like this if the direction isn’t perfect. For now though, don’t get your hopes up for much. We just gotta wait it out.

Short Range Forecast

Mostly dry. Warm (max 27°C on Thu afternoon, min 24°C on Wed night). Wind will be generally light.

Days 5-7 Weather Summary

Moderate rain (total 16mm), heaviest on Tue afternoon. Warm (max 27°C on Sun afternoon, min 25°C on Sat night). Mainly fresh winds.

Thursday
20
Friday
21
Saturday
22
Sunday
23
Monday
24
Tuesday
25
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
0
0
2
0
0
0
0
0
0
0
0
0
0
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)
0.5
SW
16
0.6
SSW
18
0.6
SSW
17
0.7
SW
16
0.7
SSW
17
0.7
SW
16
0.8
SSW
16
0.7
SW
16
0.7
SW
16
1.7
E
7
1.9
E
7
1.8
ENE
7
1.8
ENE
6
1.6
ENE
7
1.6
E
7
1.8
ENE
7
1.7
E
7
1.7
ENE
7
1.6
ENE
7
Wave Graph
Metric surfscale
Energy kJ
130
207
195
278
255
261
322
261
251
255
345
317
260
232
233
299
262
293
269
Wind (km/h)
15
NE
15
ENE
15
NE
10
NE
10
ESE
10
SE
15
NE
20
ENE
25
ENE
25
ENE
30
NE
30
NE
30
NE
30
ENE
25
ENE
20
ENE
25
E
20
ENE
20
ENE
Wind State
cross
cross
cross
cross
on
on
cross
cross-on
cross
cross
cross
cross
cross
cross
cross
cross-on
cross-on
cross-on
cross-on
High Tide
11:20AM0.53m
12:20PM0.56m
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
Low Tide
2:14AM0.09m
3:21AM0.10m
9:24PM0.19m
9:13PM0.18m
5:45AM0.08m
9:16PM0.18m
6:37AM0.05m
9:23PM0.17m
7:21AM0.04m
9:34PM0.16m
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
part cloud
clear
clear
clear
rain showers
thunderstorm
thunderstorm
thunderstorm
thunderstorm
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:16
6:16
6:16
6:16
6:16
6:18
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:05
7:04
7:02
7:01
7:01
7:00
7:00
 mm
2
4
4
6
14
Temp °C
25
26
27
26
27
27
26
27
27
25
26
27
25
26
26
25
26
26
25
Feels °C
26
28
29
29
30
30
30
28
28
25
25
26
25
25
25
25
26
27
26
  • 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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