Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 7 pm 22 Jul 2026 (local time)

Forecast update in  hr  min

Today's Ammonias sea temperature is
26.6° C
0.2° 

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


Ammonias surf forecast from 23 Jul 2026:

  • Most powerful swell: Tuesday 28 Jul, 2AM (local time) - 6ft (1.9m), 13s period, ENE swell with 1,211 kJ wave energy.

Best Forecast Surf Conditions for Ammonias this week:

The most powerful waves expected at Ammonias in the next 16 days are 1.9m 13s and forecast to arrive on Tuesday (Jul 28) 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 1.1m 6s period and expected on Tuesday (Jul 28) at 11AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 2AM (Tue 28th Jul)6ft (1.9m) 13s

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


The Lowdown

Alright folks, Rusty here. Let’s take a look at what’s on the cards for Ammonias over the next couple of weeks. I’ll be straight with you – it’s a frustrating run. There’s wave energy in the water, but the wind and conditions are just not playing ball for most of it. Don’t get your hopes up too high until the very end of the month.

The whole 16-day window kicks off on Thursday the 23rd of July, and it’s a rough start. We’ve got a solid amount of energy in the water – a combined energy of 1211 – but a brisk 19 mph ENE cross-onshore wind is making a mess of the 3ft SSW swell. The wave comment says it all: “poor surf conditions.” That’s a no-go. Thursday afternoon is barely better, with a moderate cross-shore only offering marginal surf.

Friday the 24th and Saturday the 25th are a similar story. The swell is a mix of short-period windswell and a long-period groundswell, but the wind stays cross or cross-shore, keeping the surface lumpy and chopped. You’ll see waves, but they won’t be worth the paddle out. The combined energy is still high – over 1000 – but it’s all wasted energy.

Sunday the 26th offers a tiny glimmer, with a morning session seeing 3ft of SSW swell at 16 seconds and a clear sky, but the cross-shore wind keeps the score low. It’s marginal at best. Monday and Tuesday bring a shift to a short-period easterly windswell, but the wind stays cross, and the quality is still poor to marginal.

Now, here’s the standout of the entire forecast. Thursday the 30th of July. This is the one you want to circle on the calendar. The morning session is a beauty. The wind drops to a glassy 3 mph from the NE – that’s a major positive. The wave state is described as “glassy,” and the combined energy is a moderate 485. We’re looking at 4ft of swell from the ENE with a 9-second period. For a reef break like Ammonias, that clean, glassy surface with a manageable swell is going to produce some of the best, most user-friendly waves of the whole period. This is the best on offer, and it’s not even close. The water temperature is about average for the time of year, so no nasty surprises there.

After that perfect morning, it all goes south again. The afternoon of the 30th turns onshore, and from Friday the 31st of July through to the end of the first week of August, the conditions are consistently poor. The wind is a persistent cross or cross-onshore, and the swell often has a short period or is just not clean. The combined energy drops off too, dipping below 500 for a few days.

From the 1st of August onwards, the swell picks up a little, with heights around 6ft to 7ft, but the wind is still a problem. By the 2nd of August, the swell is 7ft from the ENE at 8 seconds – it’s a mushy, cross-shore mess. The combined energy is moderate (828), but the quality is poor. This size is getting too big for beginners, and the short period is not doing it any favours.

The final stretch from the 3rd to the 7th of August is a mix of marginal and poor conditions. The wind finally eases on the 7th of August, but the swell drops to a tiny 2ft from the SSW with a long 14-second period. The combined energy is a weak 158, and the cross-onshore wind kills it. There’s nothing to work with there.

So, to sum it up: we have a long gap of poor to marginal surf until that one golden morning on Thursday the 30th of July. If you can get out for that glassy session, you’ll be stoked. After that, it’s back to choppy, cross-shore frustration. Keep your eyes on the forecasts, but for now, that Thursday morning is the only real standout.

Rusty.

Short Range Forecast

Light rain (total 7mm), mostly falling on Thu morning. Warm (max 26°C on Thu afternoon, min 24°C on Wed night). Mainly fresh winds.

Days 5-7 Weather Summary

Light rain (total 2mm), mostly falling on Sat night. Warm (max 26°C on Sun afternoon, min 23°C on Sun night). Wind will be generally light.

Thursday
23
Friday
24
Saturday
25
Sunday
26
Monday
27
Tuesday
28
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
0
1
1
2
1
1
1
2
0
2
1
2
2
1
2
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.7
SSW
22
0.8
SSW
20
0.7
SSW
20
0.9
SSW
18
2.3
ENE
7
0.9
SSW
17
2.1
ENE
7
0.9
SSW
19
1
SSW
18
1.1
SSW
18
1
SSW
16
0.9
SSW
16
0.9
SSW
16
0.9
E
14
1.1
E
14
1.9
ENE
13
1.4
E
13
1.7
ENE
13
1.5
E
12
Wave Graph
Metric surfscale
Energy kJ
480
528
399
469
542
428
468
627
731
790
575
452
416
310
452
1211
649
938
668
Wind (km/h)
25
ENE
30
ENE
25
ENE
25
ENE
30
ENE
25
NE
20
ENE
25
ENE
25
NE
25
ENE
25
ENE
25
NE
20
ENE
20
NE
25
NE
20
ENE
25
ENE
20
NE
20
NE
Wind State
cross-on
cross-on
cross
cross-on
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
High Tide
12:55PM0.57m
1:36PM0.61m
00:21AM0.18m
2:14PM0.63m
1:16AM0.20m
2:48PM0.65m
1:57AM0.21m
3:20PM0.66m
2:33AM0.23m
3:50PM0.67m
3:10AM0.25m
Low Tide
4:16AM0.04m
5:07AM0.04m
10:06PM0.17m
6:00AM0.03m
10:10PM0.16m
6:48AM0.01m
10:20PM0.16m
7:31AM-0.01m
10:33PM0.16m
8:11AM-0.02m
10:50PM0.15m
part cloud
rain showers
part cloud
part cloud
rain showers
rain showers
rain showers
rain showers
part cloud
rain showers
part cloud
clear
clear
part cloud
clear
clear
clear
clear
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:05
6:05
6:05
6:07
6:07
6:07
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:21
7:21
7:21
7:20
7:20
7:19
7:19
 mm
2
2
1
1
1
2
Temp °C
24
25
26
25
25
25
25
25
25
24
25
26
24
25
25
24
25
26
24
Feels °C
23
23
25
24
23
23
24
25
23
23
24
25
23
25
24
23
24
25
23
  • 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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