Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 1 am 10 Jul 2026 (local time)

Forecast update in  hr  min

Today's Ammonias sea temperature is
26.3° C
0.1° 

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


Ammonias surf forecast from 10 Jul 2026:

  • Most powerful swell: Sunday 12 Jul, 11PM (local time) - 7ft (2.1m), 8s period, ENE swell with 564 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 8s and forecast to arrive on Sunday (Jul 12) 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 1.7m 8s period and expected on Tuesday (Jul 14) at 5PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful11PM (Sun 12th Jul)7ft (2.1m) 8s

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


Alright folks, Rusty here. Let’s have a look at what Ammonias has cookin’ for us over the next couple of weeks. I’ll be straight with ya – this ain’t a pretty picture. We’re looking at a long, dry spell before anything even starts to look interesting.

The short-term is a write-off. From Friday the 10th right through to the end of the first week, it’s just messy. We’ve got a persistent ENE wind blowing 12 to 18 mph, mostly cross or cross-on, which is just tearing up the surface. The swell is hanging in that 5 ft to 7 ft range with a short, weak period of 7 to 8 seconds. The wave energy reads moderate, in the 400 to 900 range, but it’s all junk. There’s a consistent cross-chop or lumpy conditions, and all the scores are zeros. Nothing but poor surf. Even into the second week, those ENE winds don’t let up. The water temp is 79°F, which is bang on average for the time of year.

There’s one tiny flicker of something different around Wednesday the 15th and Thursday the 16th, where we get a tiny spike of 2 ft to 2 ft swell from the SSW with a long period, 14 to 18 seconds. The energy dips down but still reads moderate. Problem is, the wind is still blowing cross or cross-on, and the reports are still either “poor” or “marginal.” It’s not worth paddling out for.

It isn’t until we get towards the very end of the run, starting Thursday the 24th and Friday the 25th, that things get interesting. We finally see that southerly groundswell start to push through properly. The direction is SSW with periods of 16 to 18 seconds – that’s long-period, proper groundswell. The wave energy starts climbing into strong territory, hitting 882 then 950 and finally 1022. The swell size is still modest, around 3 ft to 4 ft, but that long period will give it more punch than the number suggests.

Conditions stay a problem though. Wind will be from the NE at 12 to 15 mph, cross-shore, keeping it a bit lumpy. The reports finally lift into “marginal” territory with a score of 1 or 2 out of 10. Not exactly firing, but it’s the best we’ve got.

For the standout window, if you’re desperate for a paddle, keep your eyes on Saturday the 25th afternoon. That’s when we see the strongest energy of the whole run – 1022. It’s still a small, long-period 4 ft SSW groundswell with cross-shore wind. Ammonias is a reef break that prefers SSE swell, and this is coming from the SSW, so it’s not ideal, but the long period might wrap in a few. Crowds are often an issue here, so you won’t be alone. Be aware that a 4 ft swell with a 16-second period will be more powerful than it sounds, but with that cross wind, it’s not likely to be the cleanest you’ve ever seen. It’s a long shot, but it’s the only shot.

Bottom line: this is a grim outlook. The first 10 days are a complete loss unless you’re into cross-chop. The very end of the forecast window offers a bit of hope, but it’s a long way off and the conditions are still not great. For a spot that’s fairly consistent, this is a tough run, but forecasts can change.

Rusty.

Short Range Forecast

Moderate rain (total 15mm), heaviest on Sun afternoon. Warm (max 25°C on Fri morning, min 23°C on Sun night). Mainly fresh winds.

Days 4-6 Weather Summary

Moderate rain (total 12mm), heaviest on Wed night. Warm (max 26°C on Wed afternoon, min 23°C on Mon night). Wind will be generally light.

Friday
10
Saturday
11
Sunday
12
Monday
13
Tuesday
14
Wednesday
15
Thursday
16
AM
PM
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
0
0
1
0
0
0
1
0
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)
1.9
ENE
7
1.8
ENE
7
2
ENE
7
2.1
ENE
7
1.9
ENE
7
1.9
ENE
7
2
ENE
7
2.1
ENE
8
2
ENE
8
1.9
ENE
8
1.7
ENE
8
1.7
ENE
7
1.7
ENE
8
0.7
SW
14
1.6
ENE
7
1.5
ENE
7
0.6
SSW
18
0.8
SSW
16
1.6
ENE
7
1.7
ENE
7
1.7
ENE
7
Wave Graph
Metric surfscale
Energy kJ
387
330
362
432
359
376
435
522
471
400
322
271
302
186
279
222
216
314
229
278
277
Wind (km/h)
25
ENE
30
ENE
25
ENE
25
ENE
30
NE
25
ENE
25
ENE
30
ENE
25
ENE
25
ENE
25
ENE
20
ENE
20
ENE
25
ENE
20
E
20
ENE
25
ENE
20
ENE
25
ENE
25
ENE
25
ENE
Wind State
cross
cross
cross
cross
cross
cross
cross-on
cross
cross
cross
cross
cross-on
cross
cross
cross-on
cross-on
cross
cross-on
cross-on
cross
cross-on
High Tide
1:33PM0.67m
11:46PM0.18m
2:19PM0.73m
1:06AM0.18m
3:04PM0.77m
2:08AM0.19m
3:47PM0.78m
3:04AM0.21m
4:29PM0.77m
3:58AM0.23m
5:08PM0.73m
4:55AM0.26m
5:45PM0.67m
Low Tide
9:34PM0.17m
6:09AM-0.08m
10:03PM0.14m
7:03AM-0.10m
10:34PM0.12m
7:55AM-0.11m
11:06PM0.11m
8:46AM-0.10m
11:38PM0.10m
9:34AM-0.07m
00:10AM0.09m
10:22AM-0.02m
00:42AM0.08m
rain showers
rain showers
rain showers
part cloud
part cloud
rain showers
rain showers
rain showers
rain showers
part cloud
part cloud
rain showers
part cloud
clear
rain showers
rain showers
clear
rain showers
rain showers
clear
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:00
6:01
6:01
6:01
6:01
6:01
6:03
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:23
7:23
7:23
7:23
7:22
7:22
7:22
 mm
1
2
1
3
2
3
3
2
4
2
4
1
3
Temp °C
25
25
24
25
25
24
25
25
24
25
25
24
25
25
24
25
26
24
25
26
25
Feels °C
24
24
23
24
24
23
24
23
23
24
24
23
24
24
24
24
25
24
24
25
25
  • 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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