Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 7 pm 21 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 22 Jul 2026:

  • Most powerful swell: Tuesday 28 Jul, 11PM (local time) - 7ft (2.1m), 13s period, ENE swell with 1,323 kJ wave energy.

Best Forecast Surf Conditions for Ammonias this week:

The most powerful waves expected at Ammonias in the next 16 days are 2.1m 13s and forecast to arrive on Tuesday (Jul 28) at 11PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 8s period and expected on Tuesday (Jul 28) at 5AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful11PM (Tue 28th Jul)7ft (2.1m) 13s

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


The Lowdown

Alright, Rusty here. Let’s have a look at what’s on offer for Ammonias over the next couple of weeks.

First up, I gotta be straight with you: the start of this window is a bit of a write-off. Wednesday the 22nd through Thursday the 23rd is a right mess – cross-onshore winds, lumpy, choppy, and just not worth paddling out for. The swell is tiny and weak, with combined energy around 1054 to 1142, but the wind is just ruining any chance of a clean wave. You’re better off staying on the beach.

Friday the 24th sees a jump in size, but it’s a rough one. The morning brings 7ft of swell from the ENE, but with a period of only 7 seconds – that’s short-period wind chop, not groundswell. The wind is cross-onshore and choppy, and the combined energy is 1117. It’s messy, and honestly, this setup looks more interesting for kite surfing than paddle surfing. The afternoon is a bit smaller at 6ft, but still short period and cross-shore, so it’s marginal at best.

Saturday the 25th is probably the best of a bad bunch, but that’s not saying much. The morning has 7ft from the ENE at 8 seconds (still short period), with cross-shore winds and a combined energy of 1324. The afternoon cleans up a little with a clearer sky and a 3ft SSW swell at a much better 18 seconds, but it’s cross-shore and still only marginal. The combined energy is 1301. If you’re desperate, the afternoon might offer a few longer lines from the SSW groundswell, but it’s not going to be a classic.

Sunday the 26th and Monday the 27th are much of the same: 3ft to 4ft of SSW or E swell, periods around 14 to 16 seconds, but cross-shore winds keep it from being clean. The combined energy is still strong (over 1100), but the wind is just not doing us any favours. The waves are there, but the quality isn’t.

Tuesday the 28th and Wednesday the 29th are the closest we get to a standout. The swell hangs around 5ft to 6ft from the east, with periods of 12 to 13 seconds, and the wind drops to a gentle breeze. The combined energy is between 1023 and 1146, which is moderate wave energy. The wind is cross-shore, not offshore, but it’s a lot cleaner than the earlier part of the week. The afternoon of Tuesday the 28th gets a score of 3, and the morning of Wednesday the 29th also gets a 3 – that’s the best we’ll see. The break is a reef, so it will handle the long-period swell (12-13 seconds) better than a beach break, but it’s still *fairly consistent*, not a guarantee. Crowds are *often* a thing here, so expect company.

After that, Thursday the 30th sees a drop-off. The swell gets smaller, the combined energy plummets to 318 by the afternoon, and the wind goes light cross-onshore. It’s not great. From Friday the 31st of July through to Sunday the 2nd of August, it’s back to poor conditions: fresh cross-shore winds, lumpy, and combined energy under 700. The swell is a mix of small SSW and short-period ENE, all with poor surf quality.

Monday the 3rd of August brings a bit of hope with 3ft to 7ft of ENE swell, but the period is short (8 seconds) and the wind is moderate cross-shore. The combined energy is 1030, so there’s some push, but the quality is still only marginal. Tuesday the 4th and Wednesday the 5th of August are similar: 5ft to 6ft from the ENE, periods improving to 12 seconds by Wednesday, and combined energy up to 1271. The wind stays cross-shore, so it’s rideable, but not clean. Thursday the 6th of August is the last day in the window, with 5ft of ENE swell at 10 seconds and combined energy of 837, but again, cross-shore wind.

So, for the best on offer: I’d point you to the Tuesday 28th afternoon and Wednesday 29th morning at Ammonias. The swell is 5ft to 6ft from the east, period 12-13 seconds, with gentle cross-shore winds. The combined energy is moderate (1023-1146). It’s not an offshore paradise, but it’s the cleanest we’re going to get. The swell direction is from the east, and the optimum direction for this break is SSE, so it’s not a perfect match, but it’s workable. For a reef break, those longer periods will give you some shape. Just be aware it’s *fairly consistent*, not pumping, and crowds are likely.

Honestly, if you’re looking for flawless, this isn’t it. But if you’re keen and the wind plays nice, you’ll get a few.

Rusty.

Short Range Forecast

Moderate rain (total 13mm), heaviest on Tue night. Warm (max 25°C on Tue night, min 23°C on Thu night). Wind will be generally light.

Days 5-7 Weather Summary

Light rain (total 8mm), mostly falling on Fri night. Warm (max 26°C on Sun afternoon, min 24°C on Fri night). Wind will be generally light.

Wednesday
22
Thursday
23
Friday
24
Saturday
25
Sunday
26
Monday
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
2
1
0
1
2
0
1
0
2
1
2
2
2
2
2
2
2
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1
S
13
0.6
SSW
24
0.7
SSW
23
0.7
SSW
22
0.8
SSW
20
0.7
SSW
20
0.9
SSW
18
2.2
ENE
7
0.8
SSW
17
2
ENE
7
2.1
ENE
8
1
SSW
18
1
SSW
18
1
SSW
16
1.9
ENE
8
1.1
E
15
1.2
E
14
1.2
E
14
1.2
E
14
Wave Graph
Metric surfscale
Energy kJ
352
437
564
480
528
399
469
485
363
426
506
731
662
568
452
527
594
585
541
Wind (km/h)
20
ENE
25
E
25
ENE
20
ENE
30
ENE
25
ENE
20
ENE
25
ENE
25
NE
20
ENE
25
ENE
25
NE
25
ENE
20
ENE
25
ENE
20
ENE
20
ENE
20
NE
20
NE
Wind State
cross-on
cross-on
cross
cross
cross-on
cross
cross
cross-on
cross
cross-on
cross
cross
cross
cross
cross
cross
cross
cross
cross
High Tide
12:06PM0.52m
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
Low Tide
3:30AM0.04m
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
rain showers
rain showers
rain showers
clear
rain showers
rain showers
clear
rain showers
part cloud
rain showers
rain showers
clear
rain showers
clear
clear
part cloud
rain showers
part cloud
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:05
6:05
6:05
6:05
6:07
6:07
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:22
7:21
7:21
7:21
7:20
7:20
7:19
 mm
3
3
3
1
1
2
2
2
2
2
1
Temp °C
25
25
25
24
25
25
25
24
25
24
25
25
24
25
26
24
24
25
24
Feels °C
26
25
24
23
24
24
24
24
24
22
24
24
23
24
25
23
24
24
24
  • 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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